The situation when Indesit No Frost refrigerator stops freezing often takes you by surprise. You open the door, and there the products lose their properties, and there is warmth inside, like in a room. Owners of models with the “No Frost” system are accustomed to the fact that the equipment works quietly and unnoticed, so a breakdown causes panic. However, you should not immediately call a technician, since in many cases the problem can be diagnosed independently.
System No Frost (No Frost) involves forced circulation of air, which is cooled in the evaporator hidden behind the back wall. If this cycle is broken, the cold stops flowing into the chambers. It is important to understand that compressor may continue to hum, creating the illusion of normal operation, although in fact the cooling capacity is zero. In this article we will look at the main components that fail and how to check them.
The first thing you need to do is listen to the operation of the unit. Is the engine humming? Does it click? Is there light inside? These primary symptoms will help narrow down the troubleshooting. If the compressor does not turn on at all and does not make any sounds, the problem may lie in the start relay or electronic control board, and not in the cooling system. Next we will consider in detail each possible failure scenario.
Checking the basic settings and mode work
Before taking up the tools, it is worth eliminating common operating errors. Often, users accidentally change the settings or do not take into account external factors. Temperature mode could have been changed by children or by accidentally touching the control panel. Make sure that the regulator is set to average values, and not to the minimum or the "Vacation" mode.
It is also worth checking the tightness of the fit sealing rubber. If the door does not close tightly, warm air constantly enters and the system cannot cope with cooling. This is especially true for the lower compartments, where warm air descends. In models Indesit with a bottom freezer location, this is a common problem.
- 🔍 Check whether the buttons on the control panel are stuck.
- 🚪 Make sure the door closes tightly and does not skewed.
- ❄️ Make sure that the ventilation holes inside the chamber are not clogged with food.
Refrigeration cycle may take from 2 to 12 hours depending on the ambient temperature in the room. You should not fill the chamber with food immediately after turning it on.
Malfunctions of the defrost system (Defrost)
The most common reason why Indesit refrigerator stops freezing when the compressor is running is a malfunction in the defrost system. In the No Frost system, ice gradually builds up on the evaporator. It must be turned on periodically Defrost heating elementto melt this ice. If this process does not occur, ice blocks the air supply channels.
As a result, the fan drives air, but it does not pass through the frozen evaporator into the chamber. Visually it looks like this: it’s cold in the freezer only at the back wall or in the corner, but it’s warm in the main chamber. Over time, ice can block the fan itself, which will lead to extraneous noise or its complete stop.
The key elements of this system are:
- 🔥 A defrost heating element —a heating element that can burn out.
- ⏱️ Defrost timer (or electronic module)—a device setting the intervals for turning on the heating.
- 🌡️ Defrost sensor (thermostat) - controls the temperature of the evaporator.
Diagnostics often require complete defrosting of the refrigerator for 24 hours. If after this it starts to freeze normally, but after a week the problem returns, it means that one of the elements of the defrost circuit is faulty. Indesit often uses mechanical timers, which wear out over time.
☑️ Diagnostics of the defrost system
Problems with the evaporator fan
In the system No Frost a fan is responsible for circulating cold air. It is located in the freezer, usually behind a plastic panel. If this unit fails, cold air simply does not enter the refrigerator compartment, remaining in the freezer.
Signs of a fan failure are quite specific. You can hear the compressor running, but there is silence where there should be wind noise. Sometimes the fan begins to hum, crackle or jam due to icing of the bushing. In models Indesit there are both axial and turbine fans.
To check its operation, open the freezer door and press the door button (or sensor), simulating its closing. At this moment the fan should start working. If this does not happen, or it works intermittently, it needs to be replaced or the bearing needs to be lubricated.
⚠️ Attention: Do not try to check the operation of the fan if ice is visible on the blades. This may cause the impeller to break. First, complete defrosting is necessary.
Refrigerant leakage (Freon)
If the compressor runs continuously without turning off, and there is no cold anywhere (neither in the freezer nor in the main chamber), there is a high probability freon leaks. The refrigerant circulates in a closed circuit, and if a microcrack forms in the tubes or condenser, the gas evaporates.
Unlike old models, where the leak was often visible by swelling of the wall, in modern ones Indesit with a foamed condenser it is difficult to notice. A symptom may be a hot side of the housing (the condenser heats up unevenly) or, conversely, cold pipes near the compressor.
It is impossible to eliminate the leak on your own. Required:
- 🔍 Find the leak using a leak detector or soap solution (if available).
- 🔧 Solder the tube or replace the circuit.
- 💨 Evacuate the system and fill with new freon.
This procedure requires special equipment and a license. Attempts to simply “refuel” the refrigerator without eliminating the leak will only give a temporary effect for several weeks.
Malfunction of the compressor and start relay
The heart of the refrigerator is compressor. If it doesn't start, there won't be any cold. Often the problem lies not in the motor itself, but in the start-up relay. This is a small part that fits onto the compressor contacts. In models Indesit relays often fail due to voltage surges.
Symptoms: a click is heard, an attempt to start, a hum and a click again (the protection turns off the motor). Or complete silence. If the relay is working properly, but the compressor hums and does not start, the piston group may be jammed.
The table below shows the main symptoms of compressor group malfunctions:
| Symptom | Probable cause | Actions |
|---|---|---|
| Buzzing for 5-10 seconds, clicking, silence | Faulty starting relay | Replacing the relay |
| Buzzing constantly, does not cool | Compressor wedge or leak | Diagnostics by a technician |
| Extremely hot motor housing | Overload or interturn | Replacement of the compressor |
| Quiet hum, no vibration | Break winding | Replacing the compressor |
Clogged capillary tube
Another technical malfunction typical of equipment that has been in use for several years — clogged capillary tube. Oil circulates in the system, which can oxidize over time, or moisture enters the circuit, forming an ice plug in a narrow place.
When clogged, the compressor works with increased load, trying to push freon, but there is no circulation. Condenser (condenser) can be cold or warm only at the beginning. This is a complex malfunction that requires purging the system with nitrogen and replacing the filter-drier.
It is extremely difficult to diagnose this at home without a pressure gauge station. However, if you notice that the filter drier (the small barrel near the compressor) is covered with frost or, conversely, is too hot compared to the other tubes, this is an indirect sign of problems with circulation.
⚠️ Attention: Blowing the system with compressed air from a tire compressor is prohibited! Moisture will remain in the system, which in a week will kill the new compressor.
Electronic control board
Modern models Indesit with displays and complex electronics are controlled by a module. If the board is "buggy", it may not send a command to turn on the compressor or fan. This often happens after power surges in the network.
Signs: indicators are blinking, the refrigerator beeps, does not respond to buttons, or operates in a chaotic mode. In some cases, rebooting helps: disconnect the appliance from the network for 15-20 minutes. If the problem is a software glitch, this may help.
If the reset does not help, diagnostics of the board is required. Power elements or tracks often burn out. Repairing the module is possible in a specialized workshop, but sometimes it is cheaper and more reliable to replace the entire board with an original or compatible one.
Frequently asked questions (FAQ)
Why does the Indesit refrigerator hum, but not freeze?
Most likely, the defrost system is faulty (frozen evaporator) or a freon leak has occurred. The compressor runs idle, trying to cool the volume, but there is no refrigerant or the channels are clogged with ice.
How long does it take to defrost if there are problems with No Frost?
It takes at least 24 hours for complete defrosting and evaporation of moisture from hard-to-reach places. It is better to leave the refrigerator turned off with the doors open for a day.
Is it possible to operate a refrigerator with a faulty fan?
Short-term - yes, but this will lead to uneven cooling and eventual breakdown of the compressor due to overheating. In the refrigerator compartment, food will quickly spoil.
Where can I find a refrigerator model to order spare parts?
The technical sticker with the model (for example, Indesit DF 520) is usually located inside the refrigerator compartment on the side wall or on the rear wall of the case outside.