How to check the heating element at home
Before you check the heating element you need to know what the indicators should be normal. The normal resistance of the heating element varies in the region of 20 40 Ohm, it depends on how powerful the washing machine. There are more powerful heating elements and their resistance can be up to 60 Ohm. Check the heating element with special tools multimeter or tester. To understand if the element is working or not, you need to measure its resistance or to check its resistance. If the resistance of the heating element is less than 20 ohms, this is an indication that it needs to be replaced.
Take a multimeter and do the following:
Please note! If the heating element is working, the resistance should be above 20 ohms.
If you device does not show resistance, then the reason for this was a broken coil inside the heating element, and it is worth to change it. If the resistance on the device tends to zero. there is a short circuit inside the heater.
If all readings are normal, then you need to check the heater for breakdowns. For example, the coil can work without problems, but the conductive material can be damaged, and it will lead to the fact that the current will pass through other parts of the washing machine, for example through the housing. There are cases when they say the washing machine is electrocuted. This is a serious breakdown that can lead to the failure of other parts, electronic circuit boards, and sometimes even be the cause of injury and fire.
How to check the heating element for breakdowns?
If the device shows any resistance, it means, that there is a breakdown in the heating element and it is necessary to urgently replace it with another FET.
Failure of the heating element can be caused by several reasons:
- A burned-out filament inside the tube;
- Life-threatening short-circuiting of a blown wire connected to the body of the appliance;
- A thick layer of limescale, which hinders the heat transfer process and leads to the overheating of the heating element.
How to check the water heater? First of all, it must be inspected for any damage, cracks. Tearing of the heating element cover indicates bad quality of the part. If you find minor damage or roughness, the device can not be repaired. It just needs to be replaced. If there is no visible damage, it is tested with a multimeter.
How to check the heating element with a multimeter. washing machine, boiler, air
Many common household appliances, whose main function is heating water or air, use tubular electric heaters (TEN) of different capacities as heating elements. If your washing machine or boiler at home does not heat the water, you must calibrate the circuit element with a tester. In this article a master plumber will tell you how to check the heating element with a multimeter.
The washing machine or boiler is equipment, which includes other devices that affect the operation of the entire system in one way or another. These devices are also not eternal, so in the case of malfunctioning equipment in general the owner should not reduce the cause only to the failure of the heating element. It is not uncommon to throw away electric kettles because they began to heat water slowly or shut off too often without bringing the water to a boil. This assumes, of course, burnout coil in the heater, although in fact it turns out that the cause is not in the electrical circuit node, and a thick layer of scum, which is covered the entire tube heater. All you had to do was to clean the heater of limescale and rust.
Before you repair or trash the appliance, you should test the heater to make sure of its fault. Checking will allow you to find the exact cause of why the heating element does not heat, and then you can decide what to do about it.
To understand the inspection process, you should know how a heating element is designed and works. Inside the tube, which is also the body of the device, one or more spirals of material with high resistance are laid out of metal, ceramic or glass. When turning on the heating element in the work an electric current flows in the spiral, the spiral is heated to a high temperature and heats the insulating material between the walls of the metal tube and the spiral. The insulating material is chosen for its thermal conductivity. It must be as high as possible.
In turn, the electrical insulation heats the tube, and the tube heats water or air, depending on the purpose of the household appliance. In all types of modern household appliances in the power circuit of the heating element includes a safety device that protects the heater from overheating.
This safety device may also malfunction, which confirms the recommendation not to rush with the diagnosis of the system until all its devices are checked.
If you have a multimeter, you can do the test of the heater of a broken appliance yourself. But first you will need to find the technical passport of the defective product and find the nominal value of its heater power.
This is important because in order to test an electric heater we need to know its resistance rating, which is calculated from the formula of Ohm’s basic law:
Operating voltage of home electrical network is generally 220 V. Power of the heater can be found from the passport data of the household device (W). The resistance value is obtained in ohms. Now you can start testing the electric heater.
You can check the heater with a multimeter without any difficulty, but you should be aware of some peculiarities of such diagnostics:
- You should only check with a multimeter, the efficiency of which is not in doubt.
- The places where the probes of the multimeter and metal come into contact should be cleaned of lime scale, rust and other impurities.
- The heating element can only be properly checked by completely disconnecting it from the connected wires.
These conditions are mandatory for diagnostic work, otherwise you can get false positive results, or erroneously consider the heating element to be faulty.
It does not matter what kind of multimeter or tester is used to diagnose the heating element. In order to check the heating elements you can use both pointer devices and digital models.
Particular attention should be paid to the integrity of the wires that lead from the multi-meter probe to the device. If checking the heating elements is part of the daily work process and not a necessity for home repairs, you should choose models with an alarm to check the heating element.
When using these devices, you can not be distracted from the process of repairing the product, and to determine the integrity of the electrical circuit by the sound signal.
How to Check the Electric Heating Element in a Washing MachineCheck the washing machine with a multimeter for the electric heater malfunction is simple. Modern models of household devices necessarily notify about the problem with a special sound signal, with the error code indicated on the display of the device.
The coded information can be decoded with the help of the washing machine manual, which describes the most common problems with this device.
If the error code indicates that the heating element of the device is defective, then in order to replace the device and to make sure that there is no error in the self-diagnosis of the device, you should dismantle the heating element. The work should be carried out in this sequence:
- De-energize the electrical device;
- Remove the rear protective cover of the device;
- Disconnect the wires to which the heating element is connected;
- Unscrew the screws that fix the heating element to the casing of the washing machine and carefully remove the heating element.
Check the heating element in the following sequence:
- Switch on the meter, and put it into resistance measurement mode;
- Connect one probe of the multimeter to the threaded terminal on one side of the heating element and connect the other probe to the second terminal of the heating element.
If the coil inside the sheath is intact, the display of the multimeter will show a value from 10 to 100. If the heating element is faulty, the meter will not show any values. If the multimeter is equipped with a buzzer, a highfrequency signal will signal that the heating element is in good condition. No signal indicates the necessity to replace the heating element.
If the coil is in good condition, it is not unreasonable to check the electric current leakage on the body of the heating element. To check the heating element for breakdown, you need to switch the multimeter to the resistance measurement mode to 10 kOhm and connect one probe to the body of the heating element, and the other to one of the main terminals.
The readings on the display of the multimeter should be absent. If a dial gauge is used, the arrow must remain stationary.
If at attempt to check the element for electric current leakage a “breakdown” to the body of the heating element has been detected, it is necessary to refuse further use of this element, even if the washing machine is not equipped with delicate electronic stuffing and the socket has an electric earthing contact.
If the THEN must be checked on washing machines produced in Soviet times, the whole process is carried out in the same way, and the reason for starting the test is the lack of heating of the water in the device.
In the story. 3 ways to diagnose the heating element of the washing machine
Despite the fact that many modern models of water heaters have a special anode rod for protection against corrosion, the heating elements in such devices also fail from time to time.
To be sure that the water heater has ceased to carry out its function for this reason, it is necessary to dismantle the heating element and verify the presence of this “disease.
The procedure to remove the heating element is as follows:
How To Test A Water Heater Element
- The boiler is disconnected from the mains;
- Water is drained from the water heater;
- The lower cover of the device is removed;
- Contact wires are removed;
- Unscrew the bolts holding the THEN to the boiler body;
- The heating element is removed from the housing.
To check the water heater’s heating element can be checked in the same way as the washing machine element. If the heating element is too dirty with lime deposits, or the contacts of threaded terminals were not tightened well enough and in these places there are burnings, it is necessary to carefully clean the metal surface in those places where the multimeter probes will be connected.
In the story. How to Test a Heating Element with a Multimeter
You can use a multimeter to check the heating element of any design, including air, which are less durable than those products that are used to heat water.
Faulty air heating elements can be checked not only with multimeter, but also with visual inspection.
Very often in the places of rupture of an internal spiral of such elements, there is also a deformation of the case, especially strongly subject to such changes sites of the case of the heating element in the places of bending.
Even if when checking with a multimeter you can formally define the serviceability of the heating device, but there are deep damages on the body with the bareness of the protective sealing layer, you should refuse from further use of such a heater, because of the unfavorable prognosis of the further working of the heating device.
In the story. The difference between the air heater (TEN) and the water heater
How to test the heating element with a multimeter and do it correctly is described in detail in this article. The main condition, which should be adhered to by every home electrician is the complete absence of electric current in electrical appliances and devices, during repair and diagnostic activities.
What is the purpose of the inspection?
Electric iron or boiler. this equipment, which includes other devices, in one way or another affect the operation of the entire system. These devices are also not eternal, so in case of equipment failure in general the owner should not reduce the cause only to the failure of the heating element. It is not uncommon to throw away electric kettles because they began to heat water slowly or turn off too often without bringing the water to a boil. In this case is meant, of course, burnout of the coil in the heater, although the fact is that the reason is not in the electrical circuit of the node, but in the thick layer of scale, which covers the entire tube of the heater. All you had to do was clean the outside of the heating element.
Before you start repairing or taking your appliances to the trash, you should check the heater to make sure it is malfunctioning.
Inspection will allow you to find the exact reason why the heating element does not heat, and then you can decide what to do about it.
To understand the testing process, you need to know how a heating element works. Inside the tube, which is also the body of the device, one or more spirals of material with high resistance are laid out of metal, ceramic or glass. When the heating element is turned on, an electric current flows along the coil, the coil heats up to a high temperature and heats the electric insulating material between the walls of the metal tube and the coil. The insulating material is selected with regard to its thermal conductivity. It should be as high as possible.
In turn, the electrical insulator heats the tube, and the tube heats water or air, depending on the purpose of the household unit. In all kinds of modern household appliances in the circuit of the power supply of the heating element includes a protective device that protects the heater from overheating. This safety device can also fail, which confirms the recommendation not to rush to diagnose the system until all its devices are checked.
How to check the heating element with a multimeter
Heating element is a tubular electric heating element that is installed in most modern electric household heaters that use electricity: on electric heating boilers, on the washing machine, on the water heater, on food preparation stoves, on kettles and irons.
These heating elements are designed to work from 2 to 8 years, depending on the type of household appliance. The first indicator usually corresponds to the electric kettle, and the second to the washing machine. However, this time can be significantly reduced due to improper operation of the heating element or a factory defect. After the electrical heating equipment has ceased to perform its direct function of heating, the first thing you need to know its owner is how to check the heating element with a multimeter.
How to Test for Breakdown?
Testing for breakdown. checking the insulation resistance. Ideally, the insulation should not be less than a few meg ohms. The test for a breakdown in either location is carried out with an electric shock from the housing of the washing machine and/or when the RCD is triggered. One probe of the multimeter is placed on any of the contacts, the other is placed on the body of the hot water heater. Resistance below 20 ohms, tending to zero, will indicate a case short circuit. A heating element “punctured” in the case must not be used.
Breakdown occurs when a dielectric layer is burned out from the heated coil, which can be quartz, mica, heat-resistant and heat-resistant clay like the one used to make fire bricks, etc.
This insulator fills the entire free internal part of the heater, not allowing the coil to make contact with the outer steel casing.
Professionals use mega and gigaohmmeters, which operate at 500-2500 volts. The average consumer these high-voltage testers are not always available. Wearing dielectric gloves is recommended.
The breakdown test and the tester, and megohmmeter is carried out on the washing machine with the obligatory disconnection of the terminals and de-energizing the whole machine; in this case, protection from electric shock is not required.
The thing is that ordinary testers give out only a few volts of voltage. it is not dangerous for unprotected hands, if they do not have wounds. It is recommended to switch the tester to the highest measuring range. up to 2 megohms.
How to check the heating element at home
Before you test a heater element, you need to know what the normal readings should be. The normal resistance of heating elements varies in the region of 20 40 ohms, it will depend on how powerful the washing machine. There are more powerful and their resistance can be up to 60 ohms. To check the heating element with the help of special tools. multimeter or tester. To understand if the element is working or not, it is necessary to measure its resistance or to check its resistance. If the resistance of the heating element is less than 20 OhM, this is an indication that it needs to be replaced.
Take a multimeter and do the following:
Pay attention! If the heating element is working, its resistance should be above 20 ohms.
If you device does not show resistance, then the cause is a broken coil inside the heating element and it is worth replacing. If the resistance of the device tends to zero. There is a short circuit inside the heating element.
If all indicators are normal, then you need to check the heater for breakdowns. For example, the coil may work without problems, but the conductive material may be damaged, and this will cause the current to flow through other parts of the washing machine, such as the housing. There are cases when they say the washing machine is electrocuted. This is a serious breakdown, which can lead to the failure of other parts, electronic boards, and sometimes even be the cause of injury and fire.
How to check the heating element for breakdown?
If the device shows any resistance, it means that there is a breakdown in the heating element and it is necessary to urgently replace it with another FET.
Methods for checking the water heater
Testing the heater. To verify the serviceability of the machine, you need to disassemble it, remove the heater and pull it out. Then the surface must be decalcified.
Visually inspect the outer sheath for blistering, cracks and other surface damage. If such damage is found, the heater must be replaced immediately. Such electric heaters can not be repaired.
If there is no external damage found it should be tested with a simple multimeter.
A general concept of the heating element
Included in the design of appliances designed to heat air or water. Heating elements differ in technical characteristics and structural features. The most powerful heating elements are equipped with boilers, designed to heat water in the home.
Structure of a tubular electric heater
Heating element is made in the form of a copper, iron or steel tube, in the cavity of which there is a nichrome spiral. The heating spring is surrounded by sand, which dissipates the heat and prevents overheating. The coil ends are connected to contact rods. The latter are attached to the tube by ceramic insulators. Plates are used to supply the current. Tubular heating elements differ in diameter and shape.
Where it is located
Protective cover must be removed to gain access to the heating tube. To do this, unscrew the bolts, remove the bottom cover. Beneath it there are the places where the temperature sensor and the heating element are installed.
In older models of boilers, the heater is fixed with a nut. newer machines use a clamping plate for holding the workpiece in place.