Wall-mounted gas boiler does not heat water

The first thing you need to do is to understand the basic principles of the gas equipment. A normal two-circuit boiler, designed for heating and hot water supply in the house, consists of three main units.

The first. gas. is responsible for the ignition and subsequent combustion of fuel. The second. water. is designed to supply water, its heating and pressurizing the pipelines. The third node is used to remove products of combustion to the outside.

Turning on the boiler starts a chain of successive operations:

Water circulates through the heat exchanger and is heated;

After reaching the set temperature the gas supply is stopped and the equipment is turned off.

When the temperature in the room falls below a certain level, the sensors are triggered. Boiler equipment is started and the described cycle repeats.

Boiler operating principle

To understand the causes of failure, it is necessary to understand how the boiler works. Two-circuit devices Ariston, Baxi and other models have several units. The gas module ignites and burns, the water module controls the water flow and the line pressure. The smoke exhauster takes the products of combustion outdoors.

boiler, does, heat, water

As soon as you start the boiler, the pump is activated, which pumps water into the system. The gas valve opens. Liquid circulates through the tubes of the heat exchanger and the burner warms the body evenly. Sensors control the heating process. As soon as the temperature reaches the set point, the gas supply is cut off and heating stops.

When the temperature starts to drop, sensors send a signal to the control module. the heating cycle starts again.

When you open the faucet, the flow sensor is triggered. It gives a signal to the board to switch the three-way valve to heat DHW. When the faucet is closed, the valve switches to the heating system. Some models are equipped with a quick start mode. Then the valve periodically switches, heats up both the first and the second heat exchanger.

Overcapacity

In no case should you install a boiler of higher power than required for a particular room. It is necessary to calculate the precise power required. A power shortage or overshoot can adversely affect the operation of equipment. Therefore, if you yourself to calculate the required power you have not succeeded, then you can turn to professionals who will correctly perform all calculations.

But in order to determine the output it is not enough to know the area of the heated space. The power value is affected by the following factors:

But there are many resources on the Internet, where you can find online power calculations. For a rough calculation, you can use these.

But if you bought a heating boiler and you noticed that the output is much higher than required, you need to solve this problem. Firstly, it is necessary to find out how often the boiler can be switched on during normal operation. In order to ensure normal operation for a boiler with higher output, it is necessary to install a four-way mixing valve in the hydraulic system. This option will show excellent results. But you will also have to spend a considerable amount of your money.

If your appliance has a multistage burner, you can try the burner reduction method.

Another way is to connect the boiler to the boiler. In this option, in addition to reducing the capacity of the gas heating boiler, you can provide the house with hot water. In order to determine the capacity of single-circuit and two-circuit heating boiler, you must use different schemes. It is better to choose boilers with the minimum capacity that is required to heat your home.

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In order to correct the problem of frequent switching on of the boiler, as well as to reduce fuel consumption, you can use a thermohydraulic distributor instead of a mixing valve. The cost of course is much higher, but the result is much more effective.

For a better understanding of the situation it is necessary to understand the principle of operation of the boiler. Two-circuit gas wall boilers such as Baxi or Ariston consist of several components. The gas part is responsible for burning the incoming fuel, the water part provides the supply of hot water from the heat exchangers in the heating system, the smoke removal part is responsible for the removal of combustion products outside the home.

Depending on the user’s settings, temperature sensors set the mode of water heating. Sensor on the return pipe turns off the boiler, depending on reaching the desired temperature set for the return. However, the system pump does not stop operating until the temperature of the heat exchanger is reduced.

This is to prevent the water in the boiler from boiling. As soon as the coolant cools to the limit, the electronics will send a signal to turn on the water pumping and the gas valve. The whole process will start all over again. When you open the tap in the mixer in a two-circuit boiler, the flow sensor reacts, which tells the electronics to switch the three-way valve to the mode of heating water for DHW.

When you turn off the hot water tap, it switches back to heating mode. Some manufacturers provide for both heat exchangers to be heated during periodic switching.

Three-way faucet

Such a valve is required to switch the direction of the bypass-battery. If it is the cause of the radiator not heating, the problem can be solved in 3 ways:

  • Without disassembly. In cases where the faucet is easily turned, but there is no switching at all, (no operation of either one or the other), you can try to develop the device by repeated turning movements. In this case, clogs are usually washed away by the flow, going into the riser. The operation of the stop valve is resumed in full.
  • With partial disassembly. No way to turn the valve? Not trying to break. Carefully unscrew the locking screw of the handle, remove it and put the screw back in order not to deform the part during the further operation. Further actions are performed with a wrench. It is not recommended to use round pliers, pliers, etc.д. The reason is the same as with the screw. not to spoil the piston rod. Holding the rod with a wrench slowly rock it back and forth as little as possible. If you can not make minimal movements, slightly loosen the large hex nut that holds the gland packing. If it began to drip. put a small container. Continuing the work by loosening the rod, press the stuffing box packing into place by turning the large hex nut back accordingly. Unscrew the screw, put the handle in, screw the screw in, be happy.
  • In rare cases, when the internal stop is simply torn off, the crane has the ability to turn in circles indefinitely. just choose the handle position that allows normal operation.

Why the boiler Navien Ace does not heat hot water

Wall mounted boiler Navien Ace is the leader in sales in Russia. This title is due to its reliability and ease of installation. The manufacturer of this boiler is a Korean company Navien, which, thanks to the introduction of this model on the market, has become the number 1 seller of boilers. in the Russian Federation.

Thanks to the modern design of the body, boilers Navien Ace look great in any interior. But, like any other mechanism, this boiler sometimes needs repair.

The most common complaint about this model. Boiler Navien Ace does not heat water.

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This manifests itself as follows: cold water into the boiler comes in, and at the outlet of the boiler. Water has either the same temperature, or slightly hotter than at the inlet.

Of course, to use such hot water as uncomfortable as possible, so you need to deal with the problem.

Since we very often hear a complaint about the boiler gas Navien Ice no hot water, we decided to tell you about the ways to solve this problem.

Traditionally. No one solution to the problem of the lack of hot water.

There are three modules responsible for heating of sanitary water in the boiler: a heat exchanger, in which the water is heated directly, a hydraulic unit, which switches the boiler from heating mode to water heating mode, and the water flow sensor. Which understands that cold water has started flowing through the boiler, and it needs to be heated.

In this article, we will describe these three nodes in details, and list the actions that will help in case your gas boiler Navien Ice does not heat water.

There are several main causes of this failure.

In this case, the boiler goes into water heating mode, but there is no hot water from the tap.

If the heat exchanger is clogged, it is necessary to remove the heat exchanger and perform its cleaning. If you notice damage in the heat exchanger itself. it needs to be replaced.

The second reason. is a failure of the three-way valve. In this case, as well as when the heat exchanger is clogged, when the boiler switches to DHW heating mode, Navien Ace does not heat hot water. It is necessary to replace the valve. The main sign of this breakdown is a pressure drop in the system.

The third reason that Navien Ace does not heat water. can be, breakage of the water flow sensor. With this malfunction, the boiler can not detect the flow of water through it. In this connection the boiler does not switch over to a hot water heating mode, but stays in a heating mode.

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

And now let’s troubleshoot the boiler.

How to flush and / or replace the heat exchanger. you can read in another article. Also. In another article we will describe in detail, how to replace and service the three-way valve.

Here we will tell in detail, how to replace or repair the boiler water flow sensor.

In any manipulation with the boiler, before starting the work it is necessary to disconnect the boiler from the mains.

To proceed to disassemble and determine the cause of the boiler failure, it is necessary to close the gas valve.

After that it is necessary to shut off valves on supply and return of heating and water supply and drain water from boiler. To do this: remove the plug from the filter and drain all the coolant from the boiler.

Then, after removing the fasteners from the water fittings, take the make-up pipe aside and remove the hydraulic unit.

The cause of malfunction hydro unit can be hidden in the sensor water flow, namely, the magnet installed inside the hydro unit, could stick or the rod went sideways and fell out of the sensor water flow.

In this regard, the boiler ceases to see the flow of water, resulting in a boiler Navien Ice does not heat hot water. To solve this problem it is necessary to replace the hydraulic unit.

Features of gas boilers Navien

Two-circuit gas heater Nawien among a huge number of competitors stands out for its compactness and attractive design.

Even if poor-quality gas is used, observing the requirements and recommendations of the manufacturer, gas boiler Navien will please the owner with reliable and durable operation of the complex and expensive repairs.

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Gas boiler Navien is able to maintain functionality at a voltage drop of up to 30%, the drop in gas pressure and water in the supply line. NAVIEN boilers, regardless of the type, are equipped with systems that ensure trouble-free operation in various operating conditions. Anti-freeze system will not let the water freeze in cold seasons.

The control system is intuitive and remotely adjustable. Steel heat exchangers are used, guaranteeing high efficiency and long service life.

Air pressure sensor used in the circuit ensures complete combustion of fuel, resulting in lower costs. The water heating mode is activated simultaneously with the opening of the hot water tap. The burner automatically turns on, and when you close the faucet, the system is switched to standby mode. Boiler heats water only for heating system. Winter-summer mode automatically switches the system to DHW or vice versa.

The boiler Navien combustion chamber of the closed type. Coaxial system of smoke removal prevents penetration of combustion products into the living space.

A wide range of temperature settings, both room and hot water, makes a boiler Navien competitive even with representatives from high price categories.

Three-way valve does not work

Depending on the model, this part acts as flow divider, switch, mixer. Loss of performance of the device often leads to overheating, incorrect coolant temperature.

  • Electrical actuator malfunction;
  • Wear of the flow distribution mechanism;
  • Failure of electromagnetic coil;
  • presence of condensate;
  • power surge;
  • Stray currents;
  • Entry of foreign body.

For diagnostics and elimination of the problem, it is recommended to call a suitably qualified gas engineer. Can be blown out on its own, airlock can be released. Repair involves replacing worn seals, non-working elements, or the entire valve.

Boiler Buderus does not heat water

For a clearer understanding of the situation it is necessary to understand the principle of operation of the boiler. Such two-circuit gas wall boilers like Baksi or Ariston consist of several components. In the gas section occurs combustion of the incoming fuel, the water section provides the supply of hot water from heat exchangers in the heating system, the smoke removal part is responsible for removing the products of combustion outside the house.

After starting the boiler the pump is turned on, providing the necessary level of water in the system and opens the valve supplying gas. The coolant moves in the heat exchanger, which is heated by the burner flame. Thermostat controls the temperature regime in the room, temperature sensors monitor readings on the supply and return pipes. Indicators of pressure of fuel, coolant in loops, presence of draft and combustion.

Depending on the user’s settings, temperature sensors set the mode of heating water. Sensor on the return pipe turns off the boiler, depending on reaching the required temperature set for the return. However, the system pump does not stop working until the temperature of the heat exchanger decreases.

This is to prevent the water in it from boiling over. As soon as the coolant cools to the limit, the electronics will send a signal to turn on the water pumping and the gas valve. The whole process will start all over again.When opening the tap in the faucet in a two-circuit boiler, the flow sensor reacts and informs the electronics to switch the three-way valve to DHW heating mode.

When you turn off the hot water tap, the return is switched to heating mode. Some manufacturers provide for heating both heat exchangers during periodic switching.

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