In modern refrigerators with the system No Frost or Low Frost the formation of an ice coat on the evaporator is a natural process that is regularly eliminated automatically. The heart of this system is Defrost heating elementa heating element, which is turned on at the command of a timer or electronic module to melt the ice. When this unit fails, the refrigerator stops freezing normally, and ice builds up in the freezer, blocking air circulation.
Finding the place where it is located heateris the first and most important stage of diagnosis. The location of the element may vary significantly depending on the brand, model and year of your unit. In some cases, access to it opens after removing the back panel, in others, complete disassembly of the freezer compartment is required. Understanding the design of your model will help you avoid unnecessary damage to the plastic and save time.
If you notice that a dense layer of ice has appeared on the back wall of the freezer, and food has begun to deteriorate, most likely the problem lies in the defrost circuit. Faulty heating element often accompanied by error codes on the display or a characteristic absence clicks when entering defrost mode. In this material, we will analyze in detail where to look for this element in various types of refrigerators and how to make sure that it is working.
The principle of operation of the defrosting system and the role of the heating element
The automatic defrosting system works cyclically. While the compressor pumps in cold, moisture condenses on the evaporator, hidden behind a plastic panel, and freezes. Periodically, usually every 8–12 hours, defrost timer or the electronic control unit gives a command to stop the compressor and turn on the heater. It is at this moment that defrost heating element it heats up to a certain temperature, turning ice into water, which flows into the drain pan.
Structurally, the heating element is a nichrome spiral enclosed in a metal tube, often with or without quartz filling. Different models use glass heating elements elements in the form of a “hoof”. Their main task is to quickly release thermal energy in a strictly limited space, without damaging the plastic parts or the evaporator itself. If heating does not occur, the defrost cycle is interrupted and ice continues to accumulate.
It is important to understand that the heating element does not work alone. The chain also involves defrost sensor (thermostat), which turns off the heating when a certain temperature is reached, and a fuse that protects the system from overheating. Failure of any of these elements can lead to the fact that the heating element simply does not receive power, even if it itself is working. Therefore, the search for a problem often begins with a visual inspection of the entire bundle.
⚠️ Attention: Before starting any work to find the heating element, be sure to disconnect the refrigerator from the power supply! Working with electrical wiring and wet elements under voltage is deadly.
Typical locations of the heating element in different models
The answer to the question of where the heating element is located directly depends on the design of the evaporator. In most refrigerators Indesit, Ariston and Atlant the heating element is located at the bottom of the freezer, under the evaporator. To get to it, you need to remove the rear plastic panel, behind which the radiator is hidden. The heating element in such models is often mounted on special brackets or inserted into the grooves of the evaporator itself. air duct and a radiator. The heating element in such models is often mounted on special brackets or inserted into the grooves of the evaporator itself.
In technology Samsung and LG with a system Space Pluswhere the ice container is built into the door, and the evaporator is located at the top of the freezer, the heating element can surround the bottom of the radiator or be integrated into the drainage trench. In some models quartz heaters they are installed directly in the drainage hole, preventing it from freezing. Access to them often requires dismantling not only the back wall, but also the upper box.
Refrigerators Bosch, Siemens i Liebherr are often equipped with tubular heating elements that pass through the entire length of the evaporator or are located in its lower part. In dual-compressor models, access may be easier since the evaporator design is more open. In models with a zone Fresh Zone or zero chamber, an additional heating element can be located in the drainage system of the main refrigeration compartment, although this is less common.
Heater search algorithm: step-by-step instructions
The search for a heating element always begins with preparing the workplace and dismantling interfering elements. First you need to completely empty the freezer of food, remove all shelves, drawers and containers. If there is a lot of ice in the chamber, it should be carefully removed so that it does not interfere with visibility and access to fasteners. Using a hair dryer to speed up defrosting is acceptable, but you need to heat the plastic with caution.
The next step is to remove the back panel. It is usually attached to self-tapping screws, which can be hidden under decorative plugs or plastic clips. After removing the panel, aluminum evaporatorwill open in front of you. Carefully inspect its lower part: the heating element most often looks like a curved metal tube or glass bulb located horizontally under the “ribs” of the radiator.
If the heating element is not visually visible, it may be hidden by a layer of ice or thermal insulation. In some models Stinol or old Biryusa the heater can be filled with foam or hidden under a layer of foil insulation. In such cases, increased care is required to avoid damaging the thin evaporator tubes when removing the insulation. The wires to the heating element usually come from the bottom or side and have heat-resistant insulation.
☑️ Finding and preparing to replace the heating element
⚠️ Attention: Do not use sharp objects (knife, screwdriver) to chip ice on the evaporator! One awkward movement can pierce a thin-walled tube, and the refrigerator will have to be thrown away or carried for complex soldering.
Design features of heating elements in popular brands
Different manufacturers use unique engineering solutions, which affects the location and type of heater. For example, in refrigerators Samsung there is often a dual system: one heating element heats the drip receptacle area, and the second (if any) heats the main ice mass. While in LG glass heating elements are popular, which are considered more durable, but more fragile during installation.
In budget models Indesit i Hotpoint simple tubular heaters are often installed in the form of the letter “P” or an arc. Their peculiarity is that they are attached at two points and can be easily removed after unscrewing the screws. However, in the new series of these brands, systems are being introduced where the heating element is built into the plastic casing of the evaporator, which requires replacement of the assembly or complex reassembly.
Double-circuit defrosting systems, found in premium models, deserve special attention. There may be a main heating element for the evaporator and an additional one that prevents the damper from freezing. The location of the second element is often located in the area of the air duct between the chambers, and its search requires removing the top cover of the freezer compartment. valve heater, preventing the damper from freezing. The location of the second element is often in the air duct area between the chambers, and finding it requires removing the top cover of the freezer compartment.
| Brand/Series | Typical heating element location | Heater type | Features of access |
| :--- | :--- | :--- | :--- |
| Samsung No Frost | At the bottom of the evaporator, in the drainage channel | Tubular / Quartz | Removal of the panel and sometimes the fan is required |
| LG Smart Inverter | Encircles the bottom of the radiator | Glass/Tubular | Often attached with clips, fragile |
| Indesit / Ariston | Below the evaporator, horizontally | Tubular ("hoof") | Access through the rear wall, screw mounting |
| Bosch / Siemens | At the bottom, along the tubes | Tubular Nichrome | Dense layout, good light needed |
| Atlant | In the niche under the evaporator | Tubular | Easy access after removing 4-6 screws |
Why do heating elements burn out?
Heating elements fail not only due to burnout of the coil. A common cause is corrosion of the heater housing. Moisture containing salts and chemical elements from products enters the heating element, causing electrochemical corrosion. Over time, the metal becomes thinner, a breakdown occurs on the body or the circuit breaks. Also, the cause may be a malfunction of the defrost sensor, which “does not see” the heat and keeps the heating element on for too long, leading to overheating and destruction.
Diagnostics and signs of heater malfunction
How to understand that the problem is in the heating element, and not in the timer or sensor? The most obvious sign is abundant ice on the back wall of the freezer when the compressor is running. If ice blocks the cold air ducts, the temperature in the main compartment will begin to rise, although the freezer will freeze. At the same time, the heating element itself may be cold at the moment when defrosting should take place.
For accurate diagnosis, a multimeter is needed. After removing the heating element, you need to “ring” it for an open circuit. The resistance of a working heating element is usually from 200 to 600 Ohms (depending on power). If the device shows one or infinity, the spiral has burned out. It is also necessary to check the breakdown on the body: one probe of the multimeter is placed on the contact of the heating element, the other on the metal tube. Unit on the screen means the absence of breakdown, any other values indicate breakdown and the need for replacement.
A frequent mistake is to replace only the heating element without checking the accompanying elements. If the heater burns out, there is a high probability that defrost thermostat it is also “stuck” or has failed. Installing a new heating element paired with a faulty sensor will lead to the fact that the new heater will burn out in a week or, conversely, will heat constantly, melting the plastic.
⚠️ Attention: Technical characteristics of heating elements (power, length, shape) may differ even within the same refrigerator model released in different years. Always check the markings on the old element before purchasing a new one.
Replacing a defrosting heating element: important installation nuances
The replacement process begins with disconnecting the wires. They are usually connected via a connector or twist protected by heat shrink. If twisting is used, it must be carefully cut, the contacts cleaned and prepared for a new connection. Try not to pull on the wires to avoid damaging the insulation, which becomes brittle from the cold. If necessary, use heat-resistant wire to lengthen if the standard length is not enough.
Installation of a new heating element requires fixation in the same positions as the old one. It is important that the heater does not touch the plastic walls of the chamber or the evaporator body directly, unless this is provided for by the design. Special aluminum plates or heat-conducting paste are often used to improve heat transfer. After installing all the fasteners, reassemble the structure in the reverse order, making sure that the wires are not pinched by sharp metal edges.
After assembling and connecting the refrigerator to the network, do not expect instant results. The defrost cycle may not begin immediately, but after several hours of compressor operation. It is better to carry out the first complete defrosting with a new heating element in idle mode (without food) to make sure that the water drains correctly and that there are no foreign odors that may appear from the burnout of the factory lubricant on the new element.
Is it possible to operate a refrigerator without a defrosting heating element?
Technically, the refrigerator will freeze, but very soon (in 1-2 weeks) the evaporator will be covered with an ice shell. This will block the access of cold air to the chamber, the compressor will work non-stop, trying to gain temperature, which will lead to its overheating and failure. In addition, ice can damage the fan blades.
Why does a new heating element burn out after a short time?
Most often, the reason lies in a faulty defrost sensor (thermostat), which does not turn off the heating in time, leading to overheating. The second reason is poor contact in the connection of wires, causing sparking and voltage surges. The third is the low quality of the element being replaced.
Is it necessary to lubricate the heating element with heat-conducting paste?
Yes, if the design involves a tight fit of the heating element to the metal body of the evaporator or an aluminum plate. Thermal conductive paste improves heat transfer from the heater to the metal, preventing local overheating of the coil and speeding up the defrosting process. Use pastes that are resistant to low temperatures.
How often do you need to change the defrosting heating element?
The service life of the heating element is not strictly regulated and depends on the quality of the water (air humidity in the chamber) and the frequency of defrosting cycles. On average, a high-quality element lasts 5–10 years. If your refrigerator is older than 10 years, when replacing the heating element, it is recommended to preventively replace the defrost sensor, since their service life is approximately the same.
Does a malfunction of the heating element affect energy consumption?
The heating element itself consumes little energy (usually 100–300 W) and operates briefly. However, if it doesn't work, the compressor is forced to work harder to try to compensate for the lack of air circulation through the ice block. This can increase energy consumption by 20–30% and significantly reduce the service life of the motor.