If you notice that the pressure in your Indesit refrigerator chamber has stopped decreasing, and a thick layer of ice has formed on the back wall, the problem may lie in the defrost system. In modern models with No Frost technology or a drip defrosting system, a special element is responsible for heating the evaporator - a heating element (tubular electric heater). Its failure is one of the most common causes of loss of cold, which can be diagnosed independently, having a basic set of tools at hand.
Failure to operate this unit leads to the evaporator becoming overgrown with a “fur coat” that blocks air circulation, and the compressor begins to wear out, trying to compensate for the lack of cold. In this article we will analyze in detail how to identify a malfunction, what tools are needed for diagnostics of the heating element and what design nuances Indesit you should pay special attention to before starting work.
Symptoms of defrost heater malfunction
The first sign that Defrost heating element has stopped performing its function is visual observation of the condition of the evaporator. If you remove the plastic panel in the freezer and see that the radiator is completely or partially covered with ice, this is a direct signal of a malfunction in the defrost cycle. However, ice can also appear for other reasons, so it is important to pay attention to the accompanying symptoms.
Often the breakdown is accompanied by incorrect operation of the temperature sensors or timer, but it is the heating element that burns out most often due to the natural wear of the nichrome spiral. In refrigerators Indesit with electronic control, error codes may light up on the display, indicating problems with the temperature in the freezer.
- 🧊 A dense layer of frost or ice is visible on the back wall of the freezer even after complete defrosting.
- ❄️ The refrigerator hums louder than usual, since the compressor works almost non-stop.
- 🌡️ The temperature in the main chamber is higher than normal, food begins to spoil faster.
- 💡 The indicators on the control panel blink or show incorrect values.
It is worth noting that Ignoring these signs can lead to more serious consequences, such as compressor failure or destruction of plastic housing elements due to ice expansion. Therefore, when the first symptoms are detected, it is recommended not to delay checking the heating element.
⚠️ Attention: If you find that water periodically appears under the refrigerator, this may indicate not only a malfunction of the heating element, but also a clogged drainage hole, which could also freeze due to lack of defrosting.
Necessary tools and preparation for diagnostics
Before proceeding with disassembling and checking electrical circuits, it is necessary to ensure safe working conditions. Diagnostics of heating elements involves interaction with live electrical components (at the stage of checking the circuit) and mechanical disassembly of refrigerator components. To carry out the work, you will need a minimum set of home craftsman.
The main tool will be a multimeter (tester) capable of measuring resistance in Ohms. Without this device, it is impossible to check the integrity of the nichrome thread inside the heater tube. You will also need screwdrivers (Phillips and flathead) to remove panels and fasteners.
☑️ Tools for checking the heating element
It is important to prepare the work area: move the refrigerator away from the wall, providing access to the back, and cover the floor with rags in case water drips during defrosting. Before starting any electrical manipulations Indesit refrigerator the power must be completely de-energized.
Disassembly procedure and access to the evaporator
Access to the heating element in different models Indesit may differ, but the general principle is the same. In No Frost system refrigerators, the heating element is usually located at the bottom of the freezer, under the plastic panel behind which the evaporator is hidden. In some models, access is provided through the rear wall of the chamber.
First you need to completely defrost the unit. Even if you plan to just check the heating element, the presence of ice will make it difficult to remove the panels and may cause the plastic latches to break. After defrosting, remove the freezer shelves and drawers.
Carefully remove the screws securing the back or bottom panel. In Indesit No Frost models it is often necessary to remove air channels and sensors that may interfere with access to the heater. Proceed with caution, as plastic becomes brittle in the cold.
⚠️ Attention: Do not use sharp objects (knives, screwdrivers) to chip the ice on the evaporator. You may damage the circuit tubes or puncture the insulation of the wires, which will lead to a freon leak or short circuit.
After removing the panels, you will see the aluminum evaporator radiator. In its lower part, often in the form of a curved tube or rod, the desired one will be located heating element. It must be connected to two wires protected by heat-resistant insulation.
Indesit design features
In some Indesit models (for example, BIA or C series), the heating element can be integrated into the plastic casing of the evaporator. In such cases, replacement requires carefully snapping off the latches. Do not pull the wires - first release the heater body from the seats.
Checking the heating element with a multimeter: step-by-step instructions
The most reliable way to determine the performance of the element is to measure its electrical resistance. To do this, switch the multimeter to resistance measurement mode (indicated by the Ω symbol), selecting a limit of 2 kOhm (2000 Ohm) or automatic mode.
Disconnect the power terminals from the heating element. If the wires are connected through a connector, simply unplug it. If twisting or soldering is used, you may need to carefully disconnect the contacts after photographing the connection diagram. Apply the multimeter probes to the heater contacts.
| Indication on the multimeter | Value | Action |
|---|---|---|
| Infinity (1 or OL) | Open circuit | Replacement of heating element |
| 0 Ohm | Short circuit | Replacement of heating element |
| 200 - 600 Ohm | Normal (working condition) | Checking other components |
| Unstable readings | Failure of contact inside | Replacing the heating element |
Normal resistance a working heating element for refrigerators Indesit is usually from 200 to 600 Ohms, depending on the power of the element (usually 300-400 W). If the device shows one on the left (infinity), it means that the nichrome thread has burned out and the circuit is broken.
It is also necessary to check the breakdown on the housing. Press one probe to the contact of the heating element, and the other to the metal tube or heater body. The multimeter should show infinity. If there is any resistance, then the insulation is broken, and operating such an element is strictly prohibited due to the risk of electric shock.
Diagnostics of associated elements of the defrost system
It often happens that the heating element itself is working, has normal resistance, but does not turn on. In this case, the problem lies in the control circuits. In Indesit refrigerators, a defrost thermostat (defroster) and, in some models, a timer or an electronic control module are responsible for turning on the heater.
The defrost thermostat is a bimetallic plate that opens the circuit when a certain temperature is reached (usually around 10-15°C) to prevent overheating. In a cold state (in the presence of ice) it should be closed. Check it with a multimeter: when cold, the resistance should be 0 Ohm (closed), and when heated (you can warm it up with a hairdryer) it should open.
- 🔌 Check the integrity of the wires going to the heating element - they often fray or burn out at the bend points.
- 🧠 Make sure that the control module a signal comes about the need for defrosting.
- 🌡️ Check the evaporator temperature sensor - if it is “lying”, the module may not give a command to turn on the heating element.
If all elements of the circuit are working, but the heating element does not heat, the control unit itself may be faulty. However, before sinning with electronics, make sure that the contacts in the connectors are not oxidized and are securely fixed.
Replacing the heating element and assembling the refrigerator
If the diagnostics confirmed a malfunction, replacing the heating element is the only solution. In stores of spare parts for household appliances Indesit you can find original heaters or their high-quality analogues. When purchasing, pay attention to the power (W), overall dimensions and mounting shape.
Install the new element into the seat, carefully straightening the wires so that they do not touch sharp edges or the heater itself. Connect the connectors, observing the polarity (if any) or simply connecting the contacts. Make sure that the heating element sits tightly in its grooves and does not dangle.
Assemble in the reverse order. Reinstall the evaporator (if removed), drainage system, plastic panels and air channels. All screws must be tightened and the latches must be closed until a characteristic click is heard.
⚠️ Attention: Technical characteristics and location of components may vary slightly depending on the specific modification of the refrigerator. Always check the technical documentation of your model, if available, or focus on the visual similarity of the components.
After assembly, plug in the refrigerator. During the first hours of operation, it may work longer than usual, gaining temperature. Monitor the appearance of cold and the absence of ice during the first 24 hours.
Frequently asked questions (FAQ)
You can Is it possible to temporarily operate a refrigerator without a heating element?
Theoretically, the refrigerator will freeze, but only until the evaporator is completely covered with ice. After this, the air circulation will stop and the temperature in the chambers will begin to rise. Ice can also damage the fan or warp the plastic. Long-term operation without a working defrost will lead to compressor breakdown.
Why does a new heating element burn out after a short time?
A common reason is a malfunction of the defrost thermostat. If it does not open the circuit in time, the heating element continues to heat even after the ice has thawed, which leads to its overheating and combustion. Always check the thermostat when replacing the heater.
How much does it cost to replace a heating element in a service?
The cost consists of the price of the spare part and the work of the technician. The heater itself is inexpensive, but the price of the service may vary depending on the region and the difficulty of accessing the evaporator in your model. Indesit.
Is it necessary to change the defrost sensor along with the heating element?
Preventive replacement of the sensor is not necessary if it is working. However, if your refrigerator is more than 10 years old, it makes sense to replace it, since the life of the bimetal plate is also limited.