Navien boiler does not keep water pressure

3 most frequent problems with Navien boiler. Easy fix

Why in a gas boiler the pressure drops frequent causes and methods of elimination

To stabilize the jumps of the manometer arrows in the circuit, special compensating tanks are placed in the circuit. The pressure in the expansion heating tank displaces the working fluid back into the pipe. They are two types. Constructive differences allow them to be used in systems of different types: with the access of the coolant to the air;

In open.type contours, the circulation of the working fluid occurs due to gravity. What pressure in the expansion tank of the open.type heating system does not have a key value, it is more important than its volume. These systems are designed in such a way that at its very high point there is an expansion reservoir. This is a vessel of certain dimensions made of metal or plastic. He is leaky and the coolant in it is in contact with the air. The open.type tank can be without a cover, but it’s still better when it is. Thanks to her, garbage or insects will not fall into it, if any on the farm;

without access to the working fluid to the air;

The pressure in the expansion tank of the closed.type heating is higher than that of the usual. In closed contours, water is pumped with an electric pump, which is the root cause of the appearance of pressure. Without a pump, circulation is impossible. Schemes of such systems involve the installation of a sealed expansion tank. It can be installed anywhere in the circuit, with the exception of segments:

Its location in space also matters. Air bubbles are pushed up upward. It is impossible to get into the tank. Since this will affect what pressure will be in the expansion tank of the hermetic heating system.

The network often start a conversation about what pressure should be in the expansion tank of the heating system. To find out the latter ordinary layman will have to shove a decent amount of information, since the answers of the participants often contradict. Let’s try to lay out everything on the shelves and start with the structure.

Navien Deluxe Coaxial gas pressure values

The name of the model Type of gas Pressure in mm h20 Nozzle diameter (mm)
Maximum Minimum
Deluxe-13k Natural gas 28 eleven one.75
Deluxe-16K Natural gas 41 16 one.75
Deluxe-20K Natural gas 63 16 one.75
Deluxe-24k Natural gas 85 16 one.75
Deluxe-30K Natural gas 92 19 one.75

This error is associated with the smoke removal system of the gas boiler. Combustion products must be removed, for this in the boilers a fan is provided. To control the fan and determine the presence of permissible traction for the boiler, a differential relay is used, which is connected to the turbine with two plastic tubes. When the fan works, discharge is created, the relay closes, and the boiler functions normally.

There may be a clogging of the chimney, the presence of reverse traction or the incorrect connection of the air pressure control sensor with the fan. For the last incident, it is necessary to check that the yellow tube is connected to the lower part of the fan, and the transparent to the upper and the tubes themselves do not have damage, deformation or condensate inside.

Increased resistance in the chimney can occur due to direct gusts of wind or clogging of the chimney (a nest of birds or a web, freezing in winter). That’s right, the place of the chimney deduction is to bend to take into account the direction of the winds of a particular region at the design stage and the chimney should not be displayed on the leeward side of the house.

We settled on the most common failures in the work of Navien boilers, but in fact, error codes are significantly larger. Methods of checking and eliminating problems. this is the topic of a separate article. For convenience, we give a summary table of codes with a brief description:

Number of malfunctions A brief description of the problem
02 Low water pressure in the heating system or breakdown of the duct sensor
03 No signal from the ionization electrode
04 Incorrect signal from the flame sensor or short circuit. Make sure the lack of contact of the electrode ionization with the body of the boiler or burner, diagnose control fees.
05 Heating temperature sensor breakdown. Measure the electric resistance of the sensor and compliance with the temperature table, make sure that the sensor connection with the control board is reliable.
06 Short circuit of the heating water temperature sensor. Call or replace the sensor.
07 DOBS sensor breakdown. Check the dependence of the resistance on the temperature on the sensor, make sure of the reliability of connecting the sensor to the control unit.
08 Short circuit of a hot waterman. Call or replace the sensor.
09 Fan breakdown. Measure the resistance of the fan winding (control value of approximately 23 Ohms). Make sure that the fan terminals have a voltage of 220 V. A problem of management payment scheme is possible (the diagnosis of the Navien board is required)
ten Failure failure failure of combustion products
13 Closing the sensor of the duct from. Sticking the sensor, or malfunction of the control unit.
fifteen Internal control error (diagnostics and repair is required)
16 Overheating of the boiler. Emergency thermostat signal. The causes of overheating may insufficient circulation of the coolant (see. Error 02), the hauling of the heat exchanger or the malfunction of the thermostat itself. The operation occurs at 98 degrees, the disconnection of the accident when cooling up to 83 degrees.
27 Cliff or short circuit of the air pressure sensor

The reasons for the fall in pressure

There are a lot of factors explaining why pressure drops. Among them:

  • The flow of the coolant from the heating system.
  • Dot in power supply for a long time.
  • Problems in the operation of the expansion tank.
  • Incorrect selection and operation of equipment.

With a decrease in the pressure of the coolant, the heating unit ceases to function, since the water does not enter the tank. If the gas pressure decreases, the system automatically turns off. To prevent such troubles, it is necessary to serve the boiler in a timely manner, and take measures when it is disconnected.

Pressure drops when hot water is turned on

If the pressure falls in the heating system when hot water is turned on, this can be explained by the air suction in the heating circuit or in failures in the functionality of the 3-track valve. A similar problem is associated with a special structure of boilers.

I figure out what to do if the wall boiler begins to discard the pressure when opening a tap with hot water, it is important to understand the specifics of its work. For a successful elimination of defects, you should seek help from a specialist.

The formation of air traffic jams

If cracks appear in any place of the system and depressurization occurs, this leads to the leakage of the coolant and absorption of air into the contour. As a result, air bubbles are formed. Another appearance is also facilitated by the incorrect filling of the contour, which leads to sharp jumps in pressure. To eliminate malfunctions, it is enough to carry out the procedure for fragmentation of the installation by installing the descent.

Expressive tank defects

The reasons for the drop in pressure in the gas boiler include problems with the expansion reservoir. Perhaps there was a rupture in the design or depressurization of the nipple, which is why he began to pass air.

On the inside of the container there are 2 compartments with a membrane partition. One part contains air masses, and in the second. the coolant. As the liquid consistency warms up, it expands and increases in volume, starting with great force to influence the membrane. Under such an effect, the membrane leads to compression of the gas mixture.

If the problem has been subjected to the Navien boiler, you will need to purchase a new tank, make a replacement. However, before the acquisition, you need to make sure that the problem is related to this factor. Cases of pipe leaks, radiators or emitting the heating circuit are not excluded.

In case of damage to the membrane, the expansion tank ceases to cope with its tasks, and the pressure level decreases. To detect this defect, it is enough to knock on the design (the sound will become deaf). And with a short press on the nipple, water will spill.

Oblocatory valve defect

The task of the safety valve in the Navien boiler is to protect the heating system from excess pressure. If the permissible indicators are exceeded, the detail opens and begins to discard excess water. The standard threshold of operation is 2.5 bars.

If the valve is selected incorrectly, many false works will occur, which is why the pressure will constantly drop. To eliminate the problem, it is necessary to replace the valve.

Even in the process of using this element under the saddle, particles of dirt, scale and other garbage can accumulate, preventing its free closure. You can try to independently get rid of the problem by scrolling the valve cover in a given direction.

Then you should control the pressure indicators using a pressure gauge within 1-2 hours. If the situation has not changed, you will need to find another reason for the breakdown.

Leaks in the heating system

Constant leaks in the heating circuit is one of the key reasons explaining why pressure fell. The rate of decrease in indicators is determined by the degree of breakdown. Sometimes the pressure is reset instantly, and in other cases. slowly and gradually. If the leak remains in the visible range, it can be determined by water puddles or the appearance of condensate on the surface of the walls.

With leaks in pipes and radiators, you can not notice them, since the coolant is able to evaporate during the operation of the equipment. When turning off the boiler, if there is a leak, a puddle will appear under it.

If there is a decrease in pressure in the heating system, but it was not possible to find the cause of the problems, you will need the help of an experienced specialist who will confirm that there is no leak and will repair the Ariston gas boiler, Baxi or other model.

Problems with measuring equipment

Sometimes manometers give erroneous indicators. Low pressure on the indicators of measuring equipment can be explained by the malfunction of the device itself. In the absence of visible defects, it is worth checking automation and instrumentation. During operation, they can fail and display incorrect values.

It is not easy to find such a mistake on your own, so it is recommended to use the professional help of specialists.

How to solve the problem of pressure falling

If you have never had to restore boiler equipment with your own hands before, you should not deal with independent repair. Without knowing the schemes and principles of the operation of the units, you can make mistakes and disable the entire system.

To repair the equipment, you need to carry out a number of complex events. First of all, it is important to determine what the pressure drops in the boiler in the dual-circuit installation.

In devices with forced circulation, fluid leaks lead to problems. To determine the place of leaks, you need to conduct a comprehensive inspection of the joints.

During the initial examination, it is problematic to find a leakage place. When a puddle appears under the pipeline, you need to start the repair as quickly as possible. Otherwise, the breakdown will lead to deplorable consequences. In most cases, the repair involves the replacement of old pipes that were subjected to corrosion processes.

In the presence of a complex wiring, the process of searching for a leak site can cause a number of difficulties. With unstable pressure and the absence of the opportunity to find the cause of the breakdown, you will need to call a specialist who involves special devices to quickly and efficiently determine the error.

Before performing the repair, you need to disconnect the radiators and the boiler from the system and find the damaged area. In case of pipe deformation, it should be replaced by a new. If the leak is formed at the junction of the pipes, repeated sealing is performed. A special tape or sealant is used as a sealing composition.

If the problem is related to malfunctions in the expansion tank, it means that the inappropriate volume was chosen or the membrane was damaged. Repair will require repeated calculations or replacement of the tank.

When dropping pressure after the first launch, you should not worry about the failure of the heating system. This is a normal reaction associated with the fact that a large amount of air is present in the circuit. With normal operation of the equipment, the bubbles will leave the pipeline, and the characteristics of the circuit will be stabilized. To get bubbles faster, you will need to use a manual mechanism for air lingering.

If there is damage to the heat exchanger due to intensive operation and wear, it will be difficult to find the source of the problem without specialized equipment.

To prevent numerous problems in the operation of the heating system, including reduction of pressure, it is important to carry out comprehensive prevention and comply with a number of rules of use. It is worth monitoring the correctness of connecting the pipeline and heating elements, since many errors are made at the installation stage.

To avoid the formation of air traffic jams in the heating circuit, it is important to correctly fix the working nodes, make sure of the valves and connections, and also diagnose. The pressure is supplied using a compressor by ¼ more standard value. If after 30 minutes the indicators do not fall, this will indicate that the error is eliminated and you can proceed to the operation of the boiler in the same mode. If sharp pressure surges are noticed, you will need a re.check of the system for the presence of leaks.

To ensure heat supply and heating water in an individual residential building, owners most often install gas boilers with closed circulation of the coolant. For the installation and operation of a gas boiler, it is necessary that the gas pipeline passes nearby. If there are no gas supply networks nearby, liquefied oil gas in the cylinders can be used for heating.

Double.circuit design allows you to increase the pressure of the working environment in the system of the system. Reducing pressure contributes to the occurrence of problems during the operation of the heating system. Let us consider in more detail what the reasons are, and in what ways this unpleasant problem can be eliminated.

Leakage in the heating system

The first thing that should be checked with a slow decrease in the pressure is a leak of the coolant from the pipes or leaked radiators. And as a coolant, most often what? That’s right, water!

Believe me! Such a leak, in the heating season, is not easy to detect, and the fact is that you will not see a puddle on the floor, well, of course, if this is not a serious leak, but in this case the pressure will drop instantly instantly. Most often, the leak will be in the form of drops and you will not see these droplets, because from heated pipes they quickly evaporate.

As a result, slowly but surely the pressure will fall. You pour water over and over again and this continue to kill radiators. Because oxygen is released from the received, fresh water does not benefit them. In addition, most of the boilers have protection and with insufficient pressure are simply disconnected, it is good if you are at home and react to the problem, and if there is no one at home for a long time. Then this can turn into much more difficulties.

How and where to look for a leak

You need to pay attention to traffic jams, junction or soldering of pipes and fittings. Often you can see traces of water flowers in the form of rusty or salt divorces. But it depends on the composition of the water in your area.

It is not rarely modern radiators, aluminum or bimetallic ones, also become unusable, sometimes in extremely inconspicuous places, between ribs or below they begin to dig up due to corrosion of metal. Not rust, of course, but different chemical processes also damage them. Radiators must be carefully examined while searching for leakage.

It will be easier to detect various kinds of leakage, if you turn off the heating for a while, let the radiators cool and add pressure to about 2.5 bar. After that, you can see drops or puddles on the floor. Carefully inspect the floors under the radiators, the location of the pipes, the rations.

The boiler can also be the cause of the leak. For example, the primary heat exchanger itself or the place of its connection flows. But while these are small droplets, you will not notice anything, during the operation of the boiler they evaporate. How to leak more actively, notice the “drops” from the boiler.

Regardless of whether the burner is burning or not, digging taps of recharge or emergency discharge valve, will be clearly visible.

So, the first reason for the drop in the pressure in the system is the leak of the coolant.

Expansion tank

Another reason is an expansion tank. This is a sealed container separated by a membrane in half, one half of the tank is filled with inert gas or just air, the other is filled with a coolant (read with water).

It is designed to compensate for the pressure of the heated coolant created during the expansion of the heated.

When heated, the water in the system expands and fills its half of the tank, compressing the gas, when cooling, the coolant is again pushed into the heating system.

This is how the temperature expansion is compensated for in the heating system.

But sometimes the malfunctions of the tank itself may occur.

Falf of the expansion tank

For example, the tank body has lost tightness and the air comes out of it. This does not happen often, and as a rule leads to a fairly rapid decrease in pressure in the tank, from almost instantaneous, to several days.

Pay attention to the spool so that he also does not poison the air.

Soldier (as in a car or bicycle) is located in the upper part of the tank, air is pumped through it, which creates the necessary pressure in the tank of the expander.

Another bad malfunction of the expander is a rush of membranes inside the tank, although it is not so tender, and that you need to tear it up hard to “try”. But if this happened, then determining such a problem is not difficult.

In this case, the coolant gets from the heating system to that part of the tank that should be filled with air and if by pressing the spool from the tank to be thrown out of the tank, then the water penetrated where it should not be. the tank for replacement.

But most often the pressure in the tank decreases very slowly, due to minor natural leaks. Such a decrease in the tank has been taking place for many months or several years.

Troubleshooting Navien NPE-240A Internal Recirculation Pump

At the same time, the pressure in the expander chamber gradually decreases, it will naturally decrease and will be on the testimony of the boiler manometer.

The behavior of the boiler is very dependent on the level of this pressure in the extensor and can manifest itself in different ways. Under the next heading you will find a description of these problems.

The reasons why the pressure falls in a double.circuit gas boiler

It is difficult to detect malfunctions if you do not use professional equipment. Frequent reasons are:

  • Lack of food.
  • Coarler leak.
  • Disorder of the expansion tank.
  • Incorrect calculation of the system, respectively, the installation of inappropriate equipment.

Reducing pressure leads to stopping operation. This is due to the fall of the level: fluids in a device that cannot hide into it, or gas, which leads to automatic shutdown. To prevent such provisions, maintenance is periodically carried out, including the diagnosis and repair of damaged components.

Disconnecting electricity

If the boiler eats from electricity, then it is able to work for some time without it. But a long absence will lead to a stop of operation, which will cause a drop in pressure in the system. The solution to the problem is to install backup power. It is expensive, but effective. Or a more capacious battery for the boiler is bought.

Leak in the heating system

During the work of the circuit, the pipeline gradually becomes unusable: scale and rust accumulate. This problem is solved by cleaning the pipes.

But also may occur, for example, when the crack is formed. Due to the loss of the coolant, the pressure decreases.

The malfunction is eliminated in two ways: individual points are smeared or the pipeline is replaced.

Air exit from the expansion tank

If violations occur from the device, gas may leave. This will lead to a decrease in its pressure and increase the similar indicator of water. To eliminate the problem, you need to find and light a leak, then make up for losses. The reasons are also the problems with the tap tap. In this case, you will have to replace the device in its entirety.

If there are no leaks. general reasons

Among other malfunctions, air traffic jams are distinguished, which must be removed. They cause noise, tie vibration. The latter shakes the system, which exacerbates the situation, expanding the leaks and weakening the compounds. And the formation of corrosion is also accelerated, cold areas in the pipes occur.

Attention! Gas plugs are also formed if the circuit is incorrectly filled with water, when clogs, valve operational disorders.

There may not be a drop in pressure, but the pressure gauge shows a low indicator.

The reason for this is a malfunction of the measuring device.

It is quite difficult to detect it: it is necessary to invite a specialist with professional equipment that can accurately determine the values.

And also the problem arises in devices that regulate the heating system automatically.

No Hot Water Navien NCB 240 Bad 3 Way Valve

Features of the boiler Navien

In these units, the problem, most often, is in leaks, especially when using fluids with high m glycol. Antifreeze is very fluid, so it penetrates the smallest cracks. Sometimes they are not easy to detect, so it is recommended to invite a specialist who will carefully check the entire strapping. The discovered leaks must be fixed, then again fill the expansion tank and clean the pipes from the air.

And also the pressure is slightly reduced as the coolant cools down. Usually, after turning on the boiler, this problem is solved independently. If the fluctuations are significant, diagnosis is required. The latter can lead to repair or replacement of equipment.

To fix, it is enough to perform actions similar to the described above. In rare cases, if it is impossible to solve the problem, you will have to purchase and install a new heating device.

Wall gas boiler of the Deluxe 13a model, open combustion chamber, manufacturer. Navien, South Korea.

How to raise pressure in a closed heating system

The algorithm of actions to raise normal pressure indicators is always the same, but at first it is important to identify and eliminate the cause of the problem. Then you can start action:

  • Drain about 1-2% of the volume from the coolant.
  • Adjust (according to the instructions) pressure in the chamber of the expansion tank. To do this, you can use the manometer.
  • Open the valve at the top of the circuit and add the coolant to restore pressure.
  • For the release of all gas accumulated in radiators and pipes, you need to start the circulation pump and from time to time lower the air concentrating near the valve of the security group.
  • In the process of filling the circuit and eliminating air plugs, it is necessary to add the coolant, bringing the pressure to the desired indicator.

In the process of starting the operation of the circulation pump, the difference in values ​​should be displayed immediately. If the values ​​of the pressure gauges change slowly and with the h (jerking or a jerk in the process of starting the pump, this means that either air remains in the pipes or in the radiator.

Pros and cons of gas systems Navien

A gas boiler for heating a private house Navien has a number of undeniable advantages:

  • Freezing protection. When the temperature drops indoors, the system automatically launches the protection mode from freezing. With a decrease in water temperature below 10 ºС, a circulation pump is turned on, which provides constant circulation of the coolant in the heating system. When the temperature drops below 5 ºС, the burner is lit and the coolant warms up to 22 ºС.
  • The presence of a turbocharged system. The turbocharger fan in such boilers is located under the combustion chamber, and changes the speed of its rotation according to the counter. It goes from the air pressure mechanism APS. It turns out that the air enters the combustion chamber in a volume proportional to the volume of gas supplied. Only such a turbo system with an installed fan and APS mechanism makes it possible to ensure complete combustion of gas with the least heat loss.
  • The presence of a stainless steel heat exchanger. Unlike copper, he has high resistance to oxidation. Such a nuance largely extends the life of the naval gas boilers Navien. However, even taking into account the high stability of stainless steel to the formation of rust, such heat exchangers are very rare in boilers, since they have a much lower level of thermal conductivity compared to copper heat exchanger. And only in Navien Ace Turbo wall gas boilers there is a simulated turbocharged system to increase the efficiency of the entire system.
  • Long and safe operation of the system in conditions of constant external failures. The SMPS function available in the microprocessor protects the system from damage during interruptions in the mains. Only Navien boilers manage to function normally in conditions of significant drops. This extends their life to a large extent in comparison with other heating devices.
  • The ability to heat the room and heat water in low pressure conditions in the system.

The pressure of gas in the boiler drops. What do we have to do?

A fairly common problem when using double.circuit gas boilers, when hot water is turned on, and the pressure inside the boiler begins to drop sharply. The pressure drop occurs almost to zero, and warm water has a pungent odor. Sometimes it even happens that due to the error in reducing the pressure of the heating boiler, it automatically turns off.

Another case is that the pressure drop is observed with the temporary cessation of water supply in the house, after which the boiler fuses do not allow to start it again. When trying to turn it on, the tank will give an error about pressure problems, and simply will not turn on.

In general, the drop in pressure in the boiler is very harmful to the boiler and water supply systems, so you need to immediately diagnose the problem, and then proceed to its immediate solution. What is the matter and what to do, read below.

What is the problem of pressure reduction?

There are many reasons why such a malfunction can happen. Among the most likely, problems with the tank are distinguished, sometimes various damage to the heat exchanger. However, in most cases, the cause of pressure falling in a gas boiler lies in the non.working state of the tap tap. It can be not loosely closed, or it may be completely faulty. Even small mechanical damage to the crane can cause pressure falling. Otherwise it is called a connected valve or a crane of filling.

It is put mainly on combined or double.circuit boilers. The fact is that the water supply system and the heating circuit are reported through an open or faulty filling valve, and this should not happen. The consequence of this is the leveling of pressure, since the two systems are interconnected. Typically, inside the water supply, internal pressure is much larger than should be in the heating system.

Therefore, this pressure is quickly dissipated through the hole, and in the end it turns out that in fact the boiler and the water supply will have the same pressure.

At the same time, the boiler continues its work, but pressure indicators remain the same, since the water, expanding due to heating, flows into the water supply. It is worth only to turn on hot water, as the pressure will fall right there. That is, due to the failed crane, the boiler and water supply are essentially communicating vessels trying to balance each other.

This explains the sharp unpleasant odor, because the water, before leaving over the crane, passes through the water supply in which the already used water is merged. But you just have to turn off hot water, as pressure in the entire system returns to normal. It returns to the state in which it is when it enters the house of cold water.

But the pressure in the boiler remains low, since the water fills the boiler through the same tap tap.

It follows that this problem makes the tank constantly fill up and devastate. This is very harmful to the entire system, and there are two reasons for this:

  • Oxygen that water supply brings with it. He oxidizes all the pipes, which leads to their malfunctions. Metal corrosion very negatively affects it, which in the end can lead to serious problems. The pipes subject to corrosion are destroyed and after some time the water begins to pass through them. Repair can be very expensive, as you have to replace all equipment. The constant duct of fresh water reduces the service life of the equipment five to ten times.
  • Salt, in large numbers contained in the same water. They lead to the formation of scale, and this is also not useful for the boiler. It will be almost impossible to clean this scale from the pipes without damaging them. Leading manufacturers of heating equipment strongly recommend that the feeding is not more than the volume of the boiler, increased three times.

How to solve the pressure problem?

The very first thing to do in such cases is to check the valve. Before starting the check, make sure that the tap tap is closed as tightly as possible. Check what will happen when a gas boiler is in a turn off. To do this, disconnect it from the mains. The same thing happens even in the state. one solution is to call a service that will replace the crane. It is not recommended to replace the crane yourself at home, since special equipment may be required to perform this work.

If the pressure is reduced only while the boiler is turned on, and this does not happen during the use of warm water, but only when the boiler is turned on, then the cause of the breakdown is most likely in the expansion tank. It is easy to eliminate the malfunction itself, at home. Find a malfunction enough by an external inspection, most often it is some kind of scratch or a small hole, then pour it with special glue. If the hole is large, then the help of specialists or a complete replacement of the expansion tank will be required to repair.

The pressure in the gas boiler drops: reasons how to fix the situation

To understand why the pressure in the heating system drops, it is necessary to understand the device of the heating system. It consists of several elements: boiler, fittings, pipelines, radiators. Problems may arise with any of them. You can eliminate problems yourself with the help of improvised means. rubber, special scoles, clamps.

If the pressure falls in the heating system in the cold season, the problem needs to be solved within 2-4 hours, otherwise the equipment risks “defrost”. Further operation in this case is impossible. The pressure can fall in the system with compulsory heat circulation.

The pressure falls: how to fix the situation?

If you notice that the pressure falls in the heating system of a private house, then there was a problem with one of the components. The thermal system of the house consists of the following elements:

  • Boiler. He directs the energy that is produced during fuel combustion. The coolant is heated. They usually drown with natural gas, coal, firewood, TOA, electricity. The last type of “fuel” is the safest, but expensive. Use it quite rarely. Natural gas is popular. cheap fuel type. In 60 percent of cases, gas leakage is the reason why pressure drops.

Gas in the heating system is the most economical type of fuel

  • Expansion tank. It is located in front of the pot. Serves in order to balance the distribution of fluid. Inside the membrane. it is necessary to distinguish between oxygen and space for work. The expander “takes on” excess fluid. It appears due to expansion of space due to high temperature. The membrane stretches, the volume of oxygen becomes smaller. If the fluid temperature is reduced, then the pressure drops, the water from the tank goes into the pipes.
  • Batteries (radiators). They heat the rooms. Batteries are made of cast iron, aluminum, bimetal, steel. Bimetallic bimeters are considered ideal. they give excellent heat, losses are practically absent.
  • Pipes. We need to transmit hot liquid (water or antifreeze) from the heater to radiators and vice versa. Make pipes of plastic, aluminum, metal. Plastic are considered modern and no less reliable than metal and aluminum, but cost 2-3 times cheaper.

What is the heating system is shown in the video:

To understand how to raise pressure, you need to be able to distinguish normal indicators from critical. What should be in the gas unit:

With open heat supply, hot liquid goes up because a high pressure occurs in the boiler, while in batteries. low. Hot liquid rushes there according to the laws of physics. This happens constantly, due to which the premises are heated. Expressive tank, circulation pump are not used in such systems.

Do not kill your gas boiler and watch this video! How to lower high pressure in the heating system

With closed heat supply, where fluid or antifreeze in pipes is circulated due to the injection of pressure in the expansion tank. The transmission is used using a circulation pump.

If the indications differ from normal even by 0.1 bar, then we can say that the pressure drops in a double.circuit (or single.circuit) heater. The dual.circuit gas device has two functions: it heats the rooms and at the same time heats water to supply.

Pressure drops. the main reasons

  • Pipes or batteries are depressurized. There is a leak of fuel;
  • The expander broke. He does not support the pressure, does not act as a compensator;
  • an air bubble formed in batteries or pipes. It can be in one pipe or several at once around the entire perimeter of the building;
  • The integrity of pipes or batteries is violated. Therefore, the pressure is reduced, although sometimes losses are significant or almost invisible;
  • a tap or several at the entrances to the battery or exit from the heater was depressed.

Cranial depressurization on the battery can lead to a drop in the pressure of the heating system

Why does the boiler do not keep water pressure and what to do when gas pressure drops?

Sometimes it happens that your boiler drops the pressure and turns off. Consider several reasons why the boiler does not keep pressure in the heating system and how it can be corrected.

If constantly, even after recharge, there is a decrease in pressure, you may have radiators in the heating system leak. At first glance, you may not find this, since it will flow invisible if the batteries are hot and moisture on them evaporates.

Take a paper towel and wipe it with the joints, connection of the cranes, joints. Look at the floor, perhaps you can detect dried puddles. If nothing is found, you can use the compressor.

The batteries are cut off from the boiler using valves, water is drained from the radiators, the compressor is connected using hoses to the drain cranes and air is pumped. In places where there are fistulas, or another defect, you will hear a characteristic sound.

With the help of pacley or sealant, eliminate the course if the tap is to blame, replace it. If your heating system is mounted in the wall and wet spots are not manifested on it, you will have to contact specialists, since you can find a leak only with the help of a thermal imager. Thermal imager will be able to detect problem areas. To eliminate the leak in this case, you will have to open the problem area.

Another reason for the low pressure in the system can be incorrectly selected unit capacity. The main parameter when calculating is the volume of the premises and the presence of standard radiators. If you have ordinary pipes instead of radiators, the volume of fluid in them will be larger, respectively, and the volume of expanded fluid will also be larger.

Low water pressure in the boiler. what to do?

If there are no leaks in the radiators, then the reason why pressure disappears is in the boiler. Because of what this happens and how to raise (type, pump up, increase) pressure? If you often pump water, and the boiler does not keep pressure, there is a chance that microcracks have formed in the heat exchanger. When the boiler is heated, the cracks increase and the leak occurs. The intervention of a specialist is urgently required or a fistula can be eliminated with your own hands.

The reason for the appearance of microcracks is the wear of the heat exchanger, frequent washing with reagents, the poor quality of the metal from which it is made, the hydraulic boards with a sharp increase in the pressure in the highway. They happen, as a rule, after accidents in water lines.

Places where there are microcracks can be determined by the layer of scale. If you remove the heat exchanger is not difficult, you can try to seize them. Bittermic heat exchangers are almost impossible to repair due to design features, it will have to be changed.

In the boiler does not rise (does not gain) pressure when the fuel tap flows. If the pressure in the trunk is higher than the pressure in the boiler, the liquid through the recharge crane increases the pressure in the boiler to a critical point, there is a discharge through the safety valve.

As a result of this, the pressure is reduced, the water from the heating system transfers the liquid in the water supply and the heating system. Close the tap, check the tightness of its connection or change, in case of malfunction.

The pressure up to 0 with a three.way valve fails turns off (falls). Large pieces of scale or rusts that prevent the duct can enter the valve, clean the valve.

The problem with the expansion tank can cause pressure change. When heated, the volume of water in the system increases, this excess enters the expansion tank. Inside the tank is a rubber membrane.

The space between the outer wall and the membrane of the tank is filled with gas. Excess fluid fills the membrane and the pressure is discharged in the heating system. GAZ aligns excess pressure.

After the temperature drops, the liquid enters the system again. With a gas leak, this does not happen. The reason for the incorrect operation of the compensation tank is a worn nipple, which needs to be replaced. Worse when the membrane broke, you will have to change the tank itself.

To pump air into a compensation tank, you can use a car pump. How to add (give, pump up) pressure in an expansion tank?

When the turned off the boiler has cooled, it is necessary to carry out the following actions in the exact sequence:

  • Block all valves and taps of feed and reverse flow.
  • Drain all the water from the boiler using a drain valve until the “zero” manometer is read.
  • Measure the pressure in the compensation tank, there should not be water there.
  • Attach the pump to the spool of the expansion tank, pump up air until the water flow from the drain fitting is stopped.
  • Release air. Air release from the system
  • Pump again to the value on the pressure gauge, which is indicated in the passport to the unit.
  • Block the drain fitting.
  • Open the valves of the feed and return, turn on the unit.

If, when pumping air, the pressure quickly drops and the air goes through the connection tubes, this means that the membrane was torn.

Below are passport data in the expansion tank of some wall models.Manometer failure. this can happen if a pipe is clogged, which connects the manometer with the unit. Clean if it did not help, change the pressure gauge.

What to do when gas pressure disappears?

The drop in gas pressure can occur for the following reasons:

  • Increasing the load on the gas line on severe frosts and holidays, connecting additional consumers to the highway. Contact the gas service with a request to increase the pressure of gas.
  • The gas filter clogged. clean the filter.
  • The gas hose has clogged, change to a new.
  • The nozzles clogged. Clean them using a brush.
  • The gas valve is faulty. If the situation does not change after its disassembly and cleaning, replace it with a new.
  • Old pipes on the gas highway rusted, there is a leak. inform the gas service.

What to do if the gas supply problem occurs constantly. some users connect a gas cylinder between a gas pipeline pipe and a boiler using it as a receiver.In this case, when the unit is turned on, the gas will come directly from the cylinder, without creating a vacuum in the gas pipeline.

Why does the pressure fall in the heating boiler Navien

A pressure in the expansion tank is an indicator for which the device is used.

Control and stable work, ensure the long.term operation of the heating system.

Pressure in a gas boiler can fall for various reasons.

The reasons why the pressure falls in a double.circuit gas boiler

It is difficult to detect malfunctions if you do not use professional equipment. Frequent reasons are:

  • Lack of food.
  • Coarler leak.
  • Disorder of the expansion tank.
  • Incorrect calculation of the system, respectively, the installation of inappropriate equipment.

Reducing pressure leads to stopping operation. This is due to the fall of the level: fluids in a device that cannot hide into it, or gas, which leads to automatic shutdown. To prevent such provisions, maintenance is periodically carried out, including the diagnosis and repair of damaged components.

Disconnecting electricity

If the boiler eats from electricity, then it is able to work for some time without it. But a long absence will lead to a stop of operation, which will cause a drop in pressure in the system. The solution to the problem is to install backup power. It is expensive, but effective. Or a more capacious battery for the boiler is bought.

Leak in the heating system

During the work of the circuit, the pipeline gradually becomes unusable: scale and rust accumulate. This problem is solved by cleaning the pipes.

But also may occur, for example, when the crack is formed. Due to the loss of the coolant, the pressure decreases.

The malfunction is eliminated in two ways: individual points are smeared or the pipeline is replaced.

Air exit from the expansion tank

If violations occur from the device, gas may leave. This will lead to a decrease in its pressure and increase the similar indicator of water. To eliminate the problem, you need to find and light a leak, then make up for losses. The reasons are also the problems with the tap tap. In this case, you will have to replace the device in its entirety.

If there are no leaks. general reasons

Among other malfunctions, air traffic jams are distinguished, which must be removed. They cause noise, tie vibration. The latter shakes the system, which exacerbates the situation, expanding the leaks and weakening the compounds. And the formation of corrosion is also accelerated, cold areas in the pipes occur.

Attention! Gas plugs are also formed if the circuit is incorrectly filled with water, when clogs, valve operational disorders.

There may not be a drop in pressure, but the pressure gauge shows a low indicator.

The reason for this is a malfunction of the measuring device.

It is quite difficult to detect it: it is necessary to invite a specialist with professional equipment that can accurately determine the values.

And also the problem arises in devices that regulate the heating system automatically.

Features of the boiler Navien

In these units, the problem, most often, is in leaks, especially when using fluids with high m glycol. Antifreeze is very fluid, so it penetrates the smallest cracks. Sometimes they are not easy to detect, so it is recommended to invite a specialist who will carefully check the entire strapping. The discovered leaks must be fixed, then again fill the expansion tank and clean the pipes from the air.

And also the pressure is slightly reduced as the coolant cools down. Usually, after turning on the boiler, this problem is solved independently. If the fluctuations are significant, diagnosis is required. The latter can lead to repair or replacement of equipment.

To fix, it is enough to perform actions similar to the described above. In rare cases, if it is impossible to solve the problem, you will have to purchase and install a new heating device.

Wall gas boiler of the Deluxe 13a model, open combustion chamber, manufacturer. Navien, South Korea.

Why is the pressure in the wall boiler rises

In rare cases, the situation arises when the testimony of the pressure gauge suddenly doubles. This may be due to one of the three factors:

  • The meter broke and shows the wrong numbers.
  • The fuel tap does not withstand pressure and begins to drip.
  • Secondary heat exchanger failed.

The problem is more noticeable near the reset valve. If the device has become unusual: to throw part of the water with the air, most likely in the system increased pressure. In this case, you need to look at the testimony of the manometer.

To solve the problem, Maevsky’s crane opens on the radiator and the pressure is reset to the normal. Then they observe the indicators for some time: if they grow, then the problem is not in the measurement device.

The pressure in the double.circuit gas boiler of heating is growing

As a result of an increase in pressure on the boiler, above the nominal, periodic triggering of the locks occurs, and excess coolants from the safety valve are tired.

The heating system is not designed to work in mode when all its components experience excessive load. Overloads can lead to negative consequences due to the failure of expensive elements.

Therefore, the reason why pressure grows in a dual.circuit boiler must immediately eliminate. For users of the autonomous heating system, a list of probable malfunctions is presented that can lead to increased pressure, and ways to eliminate them.

Why should you follow the pressure in the boiler

The work of the boiler is accompanied by changes in the pressure in the circuit, which should be kept within the established limits. This means that when the boiler is turned on, the manometer should show the minimum value of the bar, and in the process of operation the pressure cannot exceed the permissible mark. Thus, three varieties of pressure are determined:

  • Dynamic pressure is the voltage of the coolant circulating in the heating circuit;
  • statistical pressure. is measured in idle and determines the load provided by the coolant on the heating circuit;
  • Maximum pressure is the limit of the permissible load at which the normal operation of the system is allowed.

If the pressure in the gas boiler is growing, then the consequence of the normal operation of the system becomes a consequence, water releases are periodically carried out through a discarding valve or from an expansion tank.

Reasons for increasing pressure in case of boiler damage

It is difficult for a person who has no experience in servicing heating systems to independently determine the true reason why the pressure in the heating boiler rises. However, to obtain an idea of ​​possible malfunctions, a list of probable causes is presented.

  • Increasing pressure to 1 atm. may occur as a result of depressurization of the heat exchanger. Such consequences are the formation of cracks in the case during prolonged operation. The appearance of cracks can be the result of a factory marriage or weak strength of the material, the consequences of a hydraulic impact or wear of equipment. In this case, the volume of the coolant systematically begins to replenish. However, visually determining the place of leakage is not possible due to instant fluid evaporation with a working burner. This malfunction leads to the replacement of the heat exchanger.
  • An increase in pressure can occur with an open valve on a fuel. Weak pressure inside the boiler contrasts with increased pressure in the pipeline. This leads to the receipt of the additional volume of water through the open valve. Thus, water pressure will gradually increase until the moment of discharge. If in the pipeline the magnitude of the pressure decreases, then the supply of water into the boiler is overlapped by the coolant, reducing the pressure in the circuit. The fabric valve must be kept in a closed state, and if it is broken, replace.
  • pressure can occur due to a three-way valve malfunction. Such a breakdown leads to admission to the water contour from the expansion tank. The CRA periodically collects on the valve, which can cause its breakdown. This element must be periodically cleaned, and in the event of a malfunction, replaced. To prevent pollution from the water supply, you can install a simple corner filter.
  • If all the signs indicate that the pressure in the circuit rises, and the arrow of the manometer does not respond, this means that it has failed. The broken device deprives the method of monitoring the operation of the system and needs to be replaced.

Excess pressure in the heating circuit will be determined according to the testimony of the manometer, if the indicator exceeded the permissible mark, it is necessary to immediately take measures. In addition to the pressure gauge, the safety valve from which water will begin to flow if the pressure rises to exceed the permissible norm.

Why is the pressure rises in the heating boiler

Filling out the heating circuit is carried out subject to the exact sequence of actions, the deviation from the rules leads to failures in the operation of the system. At the seasonal launch of the system, it is necessary to set up adjustable auxiliary elements and fix the position of the valves in the correct position.

Air traffic jam

In case of malfunctions in the operation of the heating system expressed in an arbitrary increase in pressure, the temperature of the coolant sometimes decreases and the boiler blocking occurs. As a result, in such situations, there is an unbalanced in the functioning of the system, leading to the refusal of expensive elements.

Such consequences can lead to a disagreement of the contour, and the resulting traffic jams recognize the common cause why the pressure in the boiler is growing.

The occurrence of air plugs can occur due to a number of reasons:

  • equipment malfunction;
  • the launch of the system is made with violations;
  • Refusal of automation;
  • Crack formation in the heat exchanger case.

The above consequences become the result of neglect of the established rules for the operation of the heating system.

navien, boiler, does, keep

The following actions can lead to the indicated breakdowns:

  • Filling out the contour of the hot water is made from the upper point;
  • When starting, accelerated filling the system with water is made;
  • There was no check before launch, which needs air vents, as well as each crane of Mayevsky;
  • no air descent from radiators after repair was made;
  • The vibrating impeller, which is equipped with a circulation pump, slowly pumps air, causing a circulation problem.

Such problems are eliminated by discharging the pressure from the heating circuit. Next, the contour is filled with water carried out from the lower point. It is important to consider that in the process of filling the system it is necessary to keep the cranes open that lower the air. Filling is gradually without unnecessary rush, and the emergence of water at the top of the system is the signal of the end of the process.

Why does pressure drop in a gas boiler? Frequent causes and methods of elimination

To ensure heat supply and heating water in an individual residential building, owners most often install gas boilers with closed circulation of the coolant. For the installation and operation of a gas boiler, it is necessary that the gas pipeline passes nearby. If there are no gas supply networks nearby, liquefied oil gas in the cylinders can be used for heating.

Double.circuit design allows you to increase the pressure of the working environment in the system of the system. Reducing pressure contributes to the occurrence of problems during the operation of the heating system. Let us consider in more detail what the reasons are, and in what ways this unpleasant problem can be eliminated.

During operation, a gas boiler can fail in work

Norm and control

The heat supply system adversely affects both excessively high and low pressure measured in the atmospheres. over, the normal level is 1.5-2 atmospheres.

Healthy! In multi.storey buildings with central heating, this norm is slightly higher, since here the pipes should withstand hydraulic shocks.

Types of pressure in the system

In double.circuit heating systems, the pressure is divided into the following types:

  • static. is formed under the influence of gravitational forces on the coolant; rises by 0.1 bar with an increase in height by one meter;
  • dynamic. created by forced operation of the pump unit or an increase in temperature when moving the working environment;
  • working. static uniform;
  • Excessive. the difference between atmospheric and measured;
  • Absolute. excessive atmospheric;
  • nominal. indicated by the manufacturer in technical documents for a gas boiler;
  • maximum. maximum permissible, threshold value that the device is able to endure;
  • maximum (assressing). a value at which the device is tested; may exceed the working level one and a half times.

Control devices

Gas boilers contain various components responsible for the regulation of equipment parameters and maintaining it in working condition. This system requires constant monitoring of the functioning of the system. To control fluid pressure, pressure gauges and thermomanometers are used.

Interesting! Thermomanometers allow to additionally control the temperature level.

In some systems, instead of conventional arborers, electronic sensors are used. The sensors transmit the received information to the electronic unit, which processes them and displays them on the screen.

Water pressure control is provided by the sensor installed in the system. manometer

If there is no manometer in the heating unit, then it is provided for a security group, which consists of the following components:

  • The manometer itself or thermomanometer itself.
  • Air descent to ensure an obstacle to the disgrace of the circuit.
  • A safety valve for dumping the pressure of the coolant with its strong increase.

Reasons for a drop in pressure and solution options

A pressure drop can adversely affect the normal operation of the heat supply system. In this situation, water stops entering the unit, and it automatically turns off. Therefore, it is important to provide timely maintenance, inspection and repair.

The causes of pressure falling can be different, consider the most common of them.

The pressure in the system drops when hot water is turned on

This problem is a fairly common. This phenomenon is explained by the special design of boiler rooms.

According to experts, that in reality it is just a manometer reflects incorrect meaning. The pressure of the pressure can contribute to the air leaks in the circuit or the incorrect operation of the three.way valve.

For information! If when opening a tap with hot water, the normal operation of the system is not restored over time, then the pressure is reduced, and the problem really exists.

Pressure drops due to leaks

To eliminate this type of malfunction, the owner needs to diagnose and inspection of the entire heating system, since the liquid can go through any node.

The cause of the leak may be a loosely clamped connection, the wear of heat exchangers, cracks in pipes and batteries. Most often, the tightness level is checked when the circuit is launched into operation, however, the tightness can violate during operation itself.

Nodes that need to be inspected and checked in the first place:

The discovered problems must be eliminated, after which the system will be fed with liquid until the normal pressure level is restored.

Air traffic jams

The formation of cracks and depressurization of the heat supply system leads not only to leaks, but also to the opposite effect. suction of air masses in the outline. The result of this is the formation of air bubbles.

Reduced pressure can occur due to air traffic jams

Bubbles are also formed with incorrect filling of the circuit, so air traffic jams appear in it, causing a significant drop in pressure.

Recommendation! This problem is solved through ordinary defaulting the system, thanks to the installation of descent.

Explanatory tank problem

There are cases of problems with expansion tanks. A gap is formed here or the nipple can pass air. The inner side of the tank consists of two compartments separated by a membrane. There is air in one department, and the other is filled with the coolant. When heated by a liquid working environment, its expansion occurs, and it presses on the membrane with greater force. The membrane, in turn, affects the compression of the gas mixture.

Когда оборудование функционирует длительное время, ниппель изнашивается и начинает пропускать воздух, что и приводит к снижению давления.

The problem with the expansion tank can cause pressure change

Why does the boiler do not keep water pressure and what to do when gas pressure drops?

Sometimes it happens that your boiler drops the pressure and turns off. Consider several reasons why the boiler does not keep pressure in the heating system and how it can be corrected.

If constantly, even after recharge, there is a decrease in pressure, you may have radiators in the heating system leak. At first glance, you may not find this, since it will flow invisible if the batteries are hot and moisture on them evaporates.

Take a paper towel and wipe it with the joints, connection of the cranes, joints. Look at the floor, perhaps you can detect dried puddles. If nothing is found, you can use the compressor.

The batteries are cut off from the boiler using valves, water is drained from the radiators, the compressor is connected using hoses to the drain cranes and air is pumped. In places where there are fistulas, or another defect, you will hear a characteristic sound.

With the help of pacley or sealant, eliminate the course if the tap is to blame, replace it. If your heating system is mounted in the wall and wet spots are not manifested on it, you will have to contact specialists, since you can find a leak only with the help of a thermal imager. Thermal imager will be able to detect problem areas. To eliminate the leak in this case, you will have to open the problem area.

Another reason for the low pressure in the system can be incorrectly selected unit capacity. The main parameter when calculating is the volume of the premises and the presence of standard radiators. If you have ordinary pipes instead of radiators, the volume of fluid in them will be larger, respectively, and the volume of expanded fluid will also be larger.

Low water pressure in the boiler. what to do?

If there are no leaks in the radiators, then the reason why pressure disappears is in the boiler. Because of what this happens and how to raise (type, pump up, increase) pressure? If you often pump water, and the boiler does not keep pressure, there is a chance that microcracks have formed in the heat exchanger. When the boiler is heated, the cracks increase and the leak occurs. The intervention of a specialist is urgently required or a fistula can be eliminated with your own hands.

The reason for the appearance of microcracks is the wear of the heat exchanger, frequent washing with reagents, the poor quality of the metal from which it is made, the hydraulic boards with a sharp increase in the pressure in the highway. They happen, as a rule, after accidents in water lines.

Places where there are microcracks can be determined by the layer of scale. If you remove the heat exchanger is not difficult, you can try to seize them. Bittermic heat exchangers are almost impossible to repair due to design features, it will have to be changed.

In the boiler does not rise (does not gain) pressure when the fuel tap flows. If the pressure in the trunk is higher than the pressure in the boiler, the liquid through the recharge crane increases the pressure in the boiler to a critical point, there is a discharge through the safety valve.

As a result of this, the pressure is reduced, the water from the heating system transfers the liquid in the water supply and the heating system. Close the tap, check the tightness of its connection or change, in case of malfunction.

The pressure up to 0 with a three.way valve fails turns off (falls). Large pieces of scale or rusts that prevent the duct can enter the valve, clean the valve.

The problem with the expansion tank can cause pressure change. When heated, the volume of water in the system increases, this excess enters the expansion tank. Inside the tank is a rubber membrane.

The space between the outer wall and the membrane of the tank is filled with gas. Excess fluid fills the membrane and the pressure is discharged in the heating system. GAZ aligns excess pressure.

After the temperature drops, the liquid enters the system again. With a gas leak, this does not happen. The reason for the incorrect operation of the compensation tank is a worn nipple, which needs to be replaced. Worse when the membrane broke, you will have to change the tank itself.

To pump air into a compensation tank, you can use a car pump. How to add (give, pump up) pressure in an expansion tank?

When the turned off the boiler has cooled, it is necessary to carry out the following actions in the exact sequence:

  • Block all valves and taps of feed and reverse flow.
  • Drain all the water from the boiler using a drain valve until the “zero” manometer is read.
  • Measure the pressure in the compensation tank, there should not be water there.
  • Attach the pump to the spool of the expansion tank, pump up air until the water flow from the drain fitting is stopped.
  • Release air. Air release from the system
  • Pump again to the value on the pressure gauge, which is indicated in the passport to the unit.
  • Block the drain fitting.
  • Open the valves of the feed and return, turn on the unit.

If, when pumping air, the pressure quickly drops and the air goes through the connection tubes, this means that the membrane was torn.

Below are passport data in the expansion tank of some wall models.Manometer failure. this can happen if a pipe is clogged, which connects the manometer with the unit. Clean if it did not help, change the pressure gauge.

What to do when gas pressure disappears?

The drop in gas pressure can occur for the following reasons:

  • Increasing the load on the gas line on severe frosts and holidays, connecting additional consumers to the highway. Contact the gas service with a request to increase the pressure of gas.
  • The gas filter clogged. clean the filter.
  • The gas hose has clogged, change to a new.
  • The nozzles clogged. Clean them using a brush.
  • The gas valve is faulty. If the situation does not change after its disassembly and cleaning, replace it with a new.
  • Old pipes on the gas highway rusted, there is a leak. inform the gas service.

What to do if the gas supply problem occurs constantly. some users connect a gas cylinder between a gas pipeline pipe and a boiler using it as a receiver.In this case, when the unit is turned on, the gas will come directly from the cylinder, without creating a vacuum in the gas pipeline.

The pressure of gas in the boiler drops. What do we have to do?

A fairly common problem when using double.circuit gas boilers, when hot water is turned on, and the pressure inside the boiler begins to drop sharply. The pressure drop occurs almost to zero, and warm water has a pungent odor. Sometimes it even happens that due to the error in reducing the pressure of the heating boiler, it automatically turns off.

Another case is that the pressure drop is observed with the temporary cessation of water supply in the house, after which the boiler fuses do not allow to start it again. When trying to turn it on, the tank will give an error about pressure problems, and simply will not turn on.

In general, the drop in pressure in the boiler is very harmful to the boiler and water supply systems, so you need to immediately diagnose the problem, and then proceed to its immediate solution. What is the matter and what to do, read below.

What is the problem of pressure reduction?

There are many reasons why such a malfunction can happen. Among the most likely, problems with the tank are distinguished, sometimes various damage to the heat exchanger. However, in most cases, the cause of pressure falling in a gas boiler lies in the non.working state of the tap tap. It can be not loosely closed, or it may be completely faulty. Even small mechanical damage to the crane can cause pressure falling. Otherwise it is called a connected valve or a crane of filling.

It is put mainly on combined or double.circuit boilers. The fact is that the water supply system and the heating circuit are reported through an open or faulty filling valve, and this should not happen. The consequence of this is the leveling of pressure, since the two systems are interconnected. Typically, inside the water supply, internal pressure is much larger than should be in the heating system.

Therefore, this pressure is quickly dissipated through the hole, and in the end it turns out that in fact the boiler and the water supply will have the same pressure.

At the same time, the boiler continues its work, but pressure indicators remain the same, since the water, expanding due to heating, flows into the water supply. It is worth only to turn on hot water, as the pressure will fall right there. That is, due to the failed crane, the boiler and water supply are essentially communicating vessels trying to balance each other.

This explains the sharp unpleasant odor, because the water, before leaving over the crane, passes through the water supply in which the already used water is merged. But you just have to turn off hot water, as pressure in the entire system returns to normal. It returns to the state in which it is when it enters the house of cold water.

But the pressure in the boiler remains low, since the water fills the boiler through the same tap tap.

It follows that this problem makes the tank constantly fill up and devastate. This is very harmful to the entire system, and there are two reasons for this:

  • Oxygen that water supply brings with it. He oxidizes all the pipes, which leads to their malfunctions. Metal corrosion very negatively affects it, which in the end can lead to serious problems. The pipes subject to corrosion are destroyed and after some time the water begins to pass through them. Repair can be very expensive, as you have to replace all equipment. The constant duct of fresh water reduces the service life of the equipment five to ten times.
  • Salt, in large numbers contained in the same water. They lead to the formation of scale, and this is also not useful for the boiler. It will be almost impossible to clean this scale from the pipes without damaging them. Leading manufacturers of heating equipment strongly recommend that the feeding is not more than the volume of the boiler, increased three times.

How to solve the pressure problem?

The very first thing to do in such cases is to check the valve. Before starting the check, make sure that the tap tap is closed as tightly as possible. Check what will happen when a gas boiler is in a turn off. To do this, disconnect it from the mains. The same thing happens even in the state. one solution is to call a service that will replace the crane. It is not recommended to replace the crane yourself at home, since special equipment may be required to perform this work.

If the pressure is reduced only while the boiler is turned on, and this does not happen during the use of warm water, but only when the boiler is turned on, then the cause of the breakdown is most likely in the expansion tank. It is easy to eliminate the malfunction itself, at home. Find a malfunction enough by an external inspection, most often it is some kind of scratch or a small hole, then pour it with special glue. If the hole is large, then the help of specialists or a complete replacement of the expansion tank will be required to repair.

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