Refrigerators Indesit, especially models with the system No Frost, are known for their reliability, but Even they are not immune from malfunctions of the automatic defrost system. One of the most common symptoms of a breakdown is the formation of an ice “coat” on the back wall of the refrigerator or freezer, which leads to poor cooling and increased compressor noise. In most cases, the culprit is a failed tubular electric heater, or simply a heating element.
Before calling a technician, you can independently carry out initial diagnostics, which will save time and money. Ring the heating element - this means checking its electrical integrity and the absence of a short circuit using a multimeter. This process does not require in-depth knowledge of electronics, but does require strict adherence to safety regulations and care when disassembling the unit. In this article we will analyze the algorithm of actions in detail.
It is important to understand that a heater malfunction is often accompanied by the failure of other circuit elements, such as defrost thermostat or timer (or an electronic control module). Therefore, simply replacing a burnt part does not always guarantee long-term results. An integrated approach to diagnosing the entire defrost system will help to avoid repeated breakdowns in the near future.
Symptoms of defrost heater malfunction
You can understand that the heating element has stopped performing its function long before the appearance visible ice. The first alarm bell is often an uncharacteristic buzzing or crackling sound coming from the freezer. This indicates that the fan, driving cold air, begins to touch the frozen ice with its blades. In normal operation, evaporator should be clean.
If you notice that the refrigerator is working almost non-stop, and the temperature in the main chamber has no longer dropped to the set values, this is a sure sign of air circulation problems. The ice plug blocks the channels, and the cold simply does not reach the food. In models Indesit with electronic control, error codes may light up on the display, indicating problems with temperature sensors or the defrost system.
⚠️ Attention: Operating a refrigerator with an inoperative defrost system for more than two weeks can lead to compressor failure due to constant overload. Do not ignore the first signs of icing.
Another sign is the presence of water under the refrigerator or in the bottom of the freezer. This happens when ice that should have evaporated melts unevenly or flows past the drainage hole, overflowing the pan. A visual inspection of the evaporator after defrosting often confirms guesses: if ice freezes immediately after switching on, the problem lies in the heating element.
Preparation for diagnostics and necessary tools
For a high-quality check of the heating element, you will need a minimum set of tools that any home craftsman can find. The main device will be multimeter (tester), capable of measuring resistance in Ohms and checking the integrity of the circuit (continuity mode). Without this device, diagnostics will be impossible, since it is impossible to visually determine the internal break of the spiral.
You will also need a standard set of screwdrivers (Phillips and flat-head), a knife for carefully removing the ice (if it interferes with access) and, possibly, a hair dryer to speed up defrosting. Don't forget to prepare a container for draining water and towels so as not to flood the floor during disassembly. Work should only be carried out with the power supply completely disconnected from the mains.
☑️ Preparation for checking the heating element
Before starting work, be sure to wait until the unit is completely defrosted. If ice remains inside, it can damage the plastic parts during dismantling or hide the heater mounting points. Models Indesit are characterized by the use of plastic clips, which become brittle in the cold and easily break if handled carelessly.
Dismantling and access to the heating element in Indesit refrigerators
Access to the heater in refrigerators Indesit usually located in the freezer camera. You will need to remove the back panel that hides the evaporator. Depending on the model, the panel may be secured with screws or snaps. Be careful: in older models, the screws may be hidden under plastic plugs or a layer of ice.
After removing the panel, a view of the evaporator will open. The heating element in refrigerators No Frost is most often located in the lower part of the evaporator, under the aluminum fins, or built into a special trough for collecting condensate. In some modifications, the heater may be located in the upper part or encircled. Carefully bend or remove the fixing brackets to gain visual access to the contacts.
Pay attention to the condition of the wiring. Often the wires approach the heating element from below or from the side. Before disconnecting, it is recommended to take a photo of the connection diagram so as not to mix up the contacts during assembly. Although the heating element is a symmetrical element, it is very easy to confuse it with a thermostat or sensor, and this will lead to new problems.
If access to the heating element is blocked by a large amount of ice, do not try to pick it out with a knife or chisel. You risk damaging the aluminum evaporator tubes or the heating element itself. Use warm water or a hair dryer (at a minimum temperature) to gently melt the ice crust.
Visual inspection and search for external damage
Before using the multimeter, conduct a thorough visual inspection of the removed or open heating element. Look for obvious signs of thermal damage: swelling, blackening of the housing, cracks in the metal tube. If the spiral inside burns out with the formation of an electric arc, traces of soot or melting often remain on the body.
Pay special attention to the places where the contacts exit the heater body. This is where oxidation or destruction of insulation most often occurs. If you see that the contact pads are covered with rust or a green coating, this may be the cause of poor contact, even if the spiral itself is intact. In such cases, stripping the contacts can temporarily restore operation, but it is better to replace the element.
Check the condition of the insulation of the wires going to the heating element. Melted insulation indicates overheating, which could be due to poor contact or short circuit. If the wires look suspicious, they also need to be replaced, since in conditions of high humidity and low temperatures, defective insulation will quickly lead to breakdowns.
⚠️ Attention: If mechanical damage or through holes are visible on the heating element tube, further operation of such a heater is prohibited. This can lead to electric shock when in contact with water or condensate.
Instructions: how to test the heating element with a multimeter
Now let's move on to the most important part - the electrical test. Switch the multimeter to resistance measurement mode (indicated as Ω or 2k/20k). If your device has a “dialer” mode (with a speaker icon), you can use that too, but the Ohms mode will give a more accurate picture of the state of the coil.
Attach the multimeter probes to the two contacts of the heating element. It doesn’t matter which probe you apply to which contact, since the heating element has no polarity. The device screen should display the resistance value. For heaters with a power of 200-400 W used in refrigerators Indesit, resistance in the range from 100 to 400 Ohm is considered normal..
If the device shows one (infinity) or "OL" (Over Limit), this means an open circuit. The spiral inside has burned out, and the heating element must be replaced. If the resistance is close to zero, this indicates a short circuit inside the element, which is also a malfunction. In both cases, the part is inoperative.
It is also extremely important to check the heating element for breakdown on the body. Apply one probe to any contact of the heater, and the second to the metal tube of the heating element (first clean a small area for better contact). The device should show infinity. If you see at least some resistance, it means that the insulation is broken, and using this heater It is absolutely forbidden is life-threatening.
Resistance standards and table of values
Understanding the physical processes occurring inside the heating element helps to more accurately interpret instrument readings. The resistance directly depends on the power of the heater and the voltage in the network. The calculation formula looks like R = U² / P, where U is voltage (220V), and P is power.
Below is a table with approximate resistance values for various capacities of heating elements, which are commonly found in refrigerators Indesit and other brands. Remember that the permissible measurement error can be up to 10%.
| Heating element power (W) | Approximate resistance (Ohm) | Consumption current (A) | Probable malfunction |
|---|---|---|---|
| 200 W | 240 - 265 Ohm | ~0.9 A | Broken spiral |
| 300 W | 160 - 175 Ohm | ~1.3 A | Normal |
| 400 W | 120 - 135 Ohm | ~1.8 A | Short circuit |
| 500 W | 95 - 105 Ohm | ~2.2 A | Breakdown to the body |
| 600 W | 80 - 90 Ohm | ~2.7 A | Insulation wear |
If your measurements differ radically from the tabulated data, this is a reason to think about replacing the element. It is also worth considering that the resistance of a cold heating element may differ slightly from the resistance of a heated heating element, but not so much as to change the order of the numbers. For accurate diagnostics, it is better to compare the readings with the data of a new, similar heater.
Diagnostics of related system elements
Often, replacing the heating element alone does not solve the problem, since the reason for its combustion lies in other elements of the circuit. In a defrost system Indesit the critical element is defrost thermostat (or temperature sensor). It is responsible for turning off the heater when a certain temperature is reached, preventing overheating.
Checking the thermostat is also carried out with a multimeter. At room temperature, its contacts should be closed (resistance close to 0). If the thermostat is “stuck” in the open state, the current simply will not flow to the heating element, and the refrigerator will think that the heater has burned out, although in fact the circuit is broken by the sensor.
It is also worth checking the integrity of the wiring from the control module to the evaporator. Compressor vibration and defrost/freeze cycles eventually lead to chafing of wires or oxidation of connectors. Inspect the wiring harnesses for creases and signs of rodent activity, which often live in the warm niches of refrigerators.
⚠️ Attention: If you are replacing the heating element, be sure to check the defrost thermostat. Installing a new heater in conjunction with an old, “tired” thermostat can lead to rapid failure of the new part.
Assembly and testing after replacement
After successful diagnosis and replacement of the faulty heating element, proceed with assembly. Install the heater into its seat, making sure it fits snugly against the evaporator surface or trough. Poor contact with aluminum will lead to ineffective heat transfer and rapid burnout of the new part.
Connect the wires according to the photographs taken earlier. Make sure the connectors click into place until they click. Replace the back panel of the freezer and secure it with the screws. Do not forget to return the plastic plugs and decorative elements.
Plug in the refrigerator. In the first minutes of work, listen for any extraneous sounds. The No Frost system should start, the fan should start spinning. Remember that full cooling will not begin immediately - the refrigerator will need time (from 2 to 6 hours) to gain temperature and stabilize the operating mode.
During the first 24 hours, observe the operation of the unit. Make sure that no new ice forms on the back wall and that water from the defrost system drains into the drain. If everything went well, you have extended the life of your Indesit for several years without expensive service.
Is it possible to temporarily use a refrigerator without a heating element if you often defrost it manually?
Technically, the refrigerator will freeze, but this is extremely ineffective. Ice will block airflow, the compressor will work hard, trying to compensate for poor heat transfer. This will lead to rapid failure of the compressor. In addition, manual defrosting will be required every 3-5 days, which is inconvenient.
Why did the new heating element burn out a week after replacement?
Most likely, the defrost thermostat was not replaced, which was “stuck” and did not turn off the heating, or a breakdown occurred on the housing due to poor installation. Also, the cause may be a malfunction of the control module, which sent a command for continuous heating.
Which heating element is better to buy for Indesit: original or analogue?
Original spare parts Indesit (often manufactured Thermowatt or Irca) are considered the standard of quality and last longer. However, high-quality analogues from well-known brands also show good results. The main thing is to ensure that the geometric dimensions and power match.
Do you need to lubricate the contacts of the heating element before installation?
You cannot use conventional lubricants. To protect contacts from oxidation in humid conditions, you can use special conductive lubricants or keep the connection tight. The main thing is to prevent moisture from getting into the contact area.