The situation when Indesit refrigerator stops defrosting often takes the owner by surprise. An ice crust begins to grow on the back wall of the chamber, which over time turns into a huge snowdrift, occupying a useful volume. In some cases, the ice completely blocks the access of cold air, and the food begins to deteriorate, although the compressor continues to work without interruption.
Modern models operating on the system No Frost, or combined options with drip defrosting, rely on complex automation. If this mechanism fails, the defrosting process stops. Temperature violation in this case, it is only a symptom and not the root cause.
It is important for the owner not to panic and understand that the problem most often lies in one of the elements of the defrosting system. Independent diagnostics helps to save time on calling a technician or completely eliminate the fault yourself if you have basic skills in working with a multimeter.
How the defrost system works in Indesit refrigerators
To understand why the failure occurred, you need to briefly consider operating principle. Refrigerators Indesit use cyclic defrosting of the evaporator. The compressor pumps refrigerant, which cools the evaporator, hidden behind the rear panel. During operation, moisture from the air settles on it, turning into frost.
Periodically, usually every 8-12 hours, automation gives a command to turn on the heating element. The heating element heats the evaporator, the ice melts, and the water flows into a special tray. After the cycle is completed, the heating is turned off and the cooling cycle resumes.
If this well-functioning mechanism is disrupted, the ice stops melting. Evaporator grows with a fur coat, heat transfer worsens, and the temperature in the chamber rises. The system can run idle, trying to achieve the set parameters, but due to the ice insulation this becomes impossible.
Why does the ice not melt immediately after turning on?
Ice has excellent thermal insulation properties. If a thick layer of ice has already formed on the evaporator, briefly turning on the heating element may not be enough to completely remove it. Time or mechanical assistance is required in the form of careful manual defrosting.
Main causes of malfunction of the defrosting system
There are several key components, the failure of which leads to the problem described. Most often, the culprit is one of the elements of the defrost circuit. Statistics from service centers show that breakdowns are distributed unevenly.
The first candidate for inspection is Defrost heating element. This is a nichrome spiral, which over time can burn out, like a regular light bulb. An open circuit leads to the fact that heating simply does not occur, and the ice coat grows with each cycle.
The second important element is defrost sensor (thermostat). It controls the temperature of the evaporator. If the sensor is “stuck” in the “cold” position, it does not give a command to turn on the heating, even if the ice is already frozen. Or, on the contrary, it turns off the heating element too early, preventing the ice from melting.
- ❄️ Faulty heating element: physical break of the heating coil, lack of resistance when dialing.
- 🌡️ Sensor defect: incorrect temperature readings, oxidation of contacts, violation of tightness.
- ⏱️ Timer or module failure: electronics does not send a signal to start the defrost cycle at the right time.
- 💧 Drainage clogged: water does not drain, freezes in the channel and blocks further flow, creating plug.
Diagnostics of the evaporator heating element and temperature sensor
Checking the heating element is the first step that you can do yourself. This will require access to the evaporator, which is usually hidden behind a plastic panel on the back wall of the freezer. You will need to remove the mounting screws and carefully unclip the latches.
After gaining access, visually inspect TEN. There should be no swelling, cracks or signs of corrosion. However, visual inspection is not always indicative. Accurate diagnostics can only be carried out using a multimeter switched to the resistance measurement mode (Ohms).
The normal resistance of a working heating element varies between 200–400 Ohms. If the device shows one or infinity, the circuit is broken and the part requires replacement. The temperature sensor is checked in a similar way, but its resistance depends on the ambient temperature and is usually several kOhms at room temperature.
⚠️ Attention: Be extremely careful when removing the plastic panel. Plastic becomes brittle in the freezer. Do not use sharp tools to pry off frozen latches - it is better to warm them up a little with a hairdryer or wait for defrosting.
☑️ Diagnostics of the defrost system
Problems with the defrost timer and the electronic module
In older models Indesit a mechanical timer was responsible for switching the “cooling/defrosting” modes. This is a clockwork device that physically switches contacts. Over time, the gears wear out, and the timer may get stuck in the cooling mode without starting the defrost cycle.
In more modern models, this function is taken over by electronic control module. If the triac responsible for supplying voltage to the heating element burns out, or the logic of the board’s operation is disrupted, defrosting will also not begin. Diagnostics of the module requires deep knowledge of electronics.
Often the problem lies not in the board itself, but in the oxidized contacts of the connector. Moisture penetrating inside the housing can cause corrosion of the contacts connecting the module to the heating element and the sensor. In this case, it is enough to clean the contacts or replace the chip.
| Component | Fault symptom | Check method | Probability of failure |
|---|---|---|---|
| Heating element defrost | The ice does not melt, the resistance is infinity | Discussion with a multimeter | High |
| Defrost sensor | The cycle does not start or is interrupted early | Resistance measurement | Average |
| Timer/Module | No mode switching | Checking the output voltage | Low |
| Drainage system | Water is at the bottom, ice plug | Visual inspection of the hose | Medium |
Clogged drainage system and the formation of ice plugs
Sometimes the defrosting system works properly: the heating element heats, the ice melts, but the water has nowhere to go. The drain hole that drains water into the container above the compressor may become clogged with dirt, debris, or mold. As a result, the water freezes right in the channel, forming an ice plug.
With each cycle, this plug grows until it completely blocks the drain. Water begins to accumulate at the bottom of the freezer and freeze, forming a layer of ice under the food drawers. This is a common reason why the refrigerator refrigerator seems to be faulty, although the electronics are working properly.
To fix the problem, you need to clean the drainage hole. This can be done using a soft wire, a brush or a syringe with hot water. It is important not to damage the walls of the drainage tube with sharp objects.
In some cases, full disassembly internal space is required to access the junction of the drainage with the evaporator. If the ice plug is deep, steaming with a steam generator or careful pouring with warm water may be required.
The influence of improper operation on defrosting
The reason does not always lie in the breakdown of parts. Often users themselves create the conditions for system failure No Frost. For example, loading hot foods into the chamber dramatically increases the humidity. The defrost system may not be able to cope with this amount of moisture, and ice begins to accumulate faster than it melts.
A poorly closed door or worn seal also leads to a constant flow of warm, moist air. The compressor wears out, and a new coat is constantly formed on the evaporator. In such conditions, even a working defrosting system may not be able to keep up.
Another common mistake is placing the refrigerator close to the wall or in a niche without gaps. Impaired air circulation around the condenser (black grille at the back) leads to overheating of the system and malfunction of the automation.
⚠️ Attention: Never try to pick off ice with a knife or other sharp objects. One awkward movement can break through the evaporator channels with freon. Repair in this case will become economically unfeasible.
Frequently asked questions and answers (FAQ)
How long should defrosting last in an Indesit refrigerator?
In normal mode, the defrost cycle lasts from 15 to 30 minutes. During this time, the heating element should completely melt the frost on the evaporator. If the process takes longer, the sensor may be faulty or the power of the heating element has dropped.
Is it possible to operate a refrigerator with defrosting not working?
For a short time - yes, but not for long. Constant operation of the compressor without rest will lead to its overheating and failure. In addition, an ice coat will worsen the cooling of food, which will lead to spoilage.
Why does the refrigerator not freeze again after defrosting?
Perhaps there is air left in the system after defrosting, or a power surge has occurred that has damaged the compressor starting relay. It is also worth checking whether the capillary is pinched by ice deep in the system.
How often do you need to defrost a No Frost refrigerator manually?
Technically, the system No Frost does not require manual defrosting. However, manufacturers recommend that once a year (or if an unpleasant odor appears) completely turn off the unit, wash it and let it stand turned off for 10-12 hours for prevention.