The situation when you open the refrigerator door and feel warmth instead of the usual cold always causes panic. Products can go bad in a matter of hours, and repairs often require calling a professional. However, before calling the service center, you need to conduct an initial self-diagnosis to understand the scale of the problem.
In this article we will analyze an algorithm of actions that will help determine why the unit has stopped freezing. We will cover both simple causes that do not require intervention, as well as complex technical faults such as a refrigerant leak or compressor failure. Correct diagnosis will save you time and money.
Initial visual assessment and analysis of symptoms
The first thing to do is to carefully examine the interior of the chambers. Pay attention to the condition of the products and the presence of condensation. If food in the freezer compartment begins to thaw, and condensation appears on the walls of the refrigerator compartment, this is a sure sign that cold circulation is impaired. Check whether the light inside is on when the door is open. Sometimes the problem is trivial: the refrigerator simply defrosted because it was accidentally turned off or the plug came out of the socket. Make sure that the appliance is plugged in and that there are no error indicators on the control panel (if there is one). cold circulation is disrupted.
Check if the light inside is on when the door is open. Sometimes the problem is trivial: the refrigerator simply defrosted because it was accidentally turned off or the plug came out of the socket. Make sure that the device is plugged in and that there are no error indicators on the control panel (if equipped).
⚠️ Attention: If you notice that the inside of the refrigerator smells like burnt plastic or you hear a crackling sound, immediately unplug the appliance. Operation of such equipment can lead to a fire or permanent failure of the electronics.
It is also worth checking the tightness of the door. If the rubber seal (cuff) is worn out, dirty or deformed, cold air will escape and warm air will flow inside. This causes the compressor to wear out, but does not provide the required temperature.
Checking the operation of the compressor and start relay
The compressor is the “heart” of the refrigerator, ensuring the movement of refrigerant through the system. To check its operation, you need to listen to the sounds coming from behind the unit. A working motor works cyclically: it turns on, hums for a certain time, then turns off to rest.
If you hear that the motor is trying to start, makes a click and immediately stalls, or hums for only a couple of seconds and goes silent, the problem lies in starting relay or the compressor itself. In modern models with an inverter motor, the sound of operation can be almost inaudible, so you should put your hand on the motor housing - it should vibrate slightly.
In some cases, the compressor works continuously without turning off, but there is still no cold. This may indicate a freon leak or a blockage in the capillary tube. The motor tries to compensate for the lack of pressure by operating at its limit, which often leads to overheating and burning out the windings.
What is a starting relay?
A starting relay is a small mechanism that supplies a pulse of current to the motor winding to start it. If the relay is faulty, the compressor cannot gain the required speed and hums in vain, after which the thermal sensor turns off the power to avoid a fire.
Diagnostics of the defrosting system and evaporator
In refrigerators with a system No Frost or Full No Frost for the outlet The heat is provided by an evaporator hidden behind the rear plastic panel. If the defrosting system (heating element, defrost sensor or timer) fails, a “coat” of ice grows on the evaporator.
Ice blocks the ventilation ducts, and cold air simply cannot flow into the main chamber. As a result, the freezer may still freeze somehow (if the ice has not reached it), but the refrigerator compartment will be warm. You can check this by carefully removing the back panel inside the freezer.
- ❄️ Find the evaporator and estimate the amount of ice - normally there should not be any.
- 🔌 Check the integrity of the defrost heating element using a multimeter for an open circuit.
- 🌡️ Make sure that the defrost temperature sensor is not “stuck” in the “frozen” position.
If you find a huge lump of ice, defrost the refrigerator completely, leaving it turned off with the doors open for 10-12 hours. After defrosting, turn on the appliance. If it started to freeze normally, but after 1-2 weeks the problem recurred, it means that one of the elements of the defrosting system is faulty.
☑️ Checking the No Frost system
How to detect a freon leak or blockage
Refrigerant (freon) circulates in a closed loop. If a microcrack has formed in the system, the gas gradually evaporates. The main sign of a leak is the compressor runs non-stoptrying to increase the temperature, but there is no effect. In this case, the motor itself may be hot, and the condenser (grid at the back) may be barely warm or cold.
A clogged capillary tube gives similar symptoms, but is often accompanied by unusual sounds: gurgling, hissing or whistling inside the tubes. This occurs because freon has difficulty passing through the blocked area. Often the blockage is caused by moisture entering the system or wear products of the compressor.
| Symptom | Probable cause | Condenser temperature |
|---|---|---|
| Humming constantly, no cold | Leakage freon | Warm only at the motor |
| Clicks and turns off | Faulty compressor/relay | Cold |
| Noisy, gurgles, freezes weak | Clogged capillary system | Uneven heating |
| Rarely turns on, enough cold | Thermostat malfunction | Normal |
It is impossible to refill the refrigerator yourself or remove the blockage without special equipment (vacuum pump, scales, pressure gauge station). These works require qualifications and a license to work with fluorine-containing gases.
Checking the thermostat and control electronics
Thermoregulator (thermostat) is a device that commands the compressor to turn on or off depending on the temperature inside the chamber. If it is faulty, the contacts may not close, and the motor simply will not start, even if the refrigerator is warm.
In mechanical models, the thermostat can be checked by closing its contacts directly (bypassing the regulator itself). If after this procedure the refrigerator “came to life” and began to freeze, then the regulator needs to be replaced. In electronic models, thermal sensors are responsible for temperature control. control module and temperature sensors.
⚠️ Attention: When checking electrical circuits, be sure to unplug the refrigerator from the outlet. Working with live electricity is life-threatening.
If the electronic control module is malfunctioning, it may not supply voltage to the compressor or fan. This is often accompanied by blinking indicators on the front panel. In such cases, it may be necessary to reflash or replace the board.
The influence of external factors and proper operation
Sometimes the refrigerator is working properly, but cannot create cold due to improper operating conditions. For example, if the device is placed close to a wall or in a niche without gaps, heat transfer is disrupted. The condenser does not have time to cool down, and the operating efficiency drops.
It is also important to consider the room temperature. Most refrigerators are designed to operate at ambient temperatures between +16°C and +32°C. If the room is colder (for example, in an unheated country house in winter), the oil in the compressor thickens and it cannot start.
- 🚪 Do not place the refrigerator next to a radiator, stove or in direct sunlight.
- 🧊 Do not load warm food into the chamber - this creates unnecessary load.
- 🌬️ Provide a gap of at least 5-10 cm around the body for ventilation.
Frequent and prolonged opening of doors also prevents the temperature from rising. If the house is hot and you constantly look into the refrigerator, it may simply not cope with the heat flow, especially if the seal is not ideal.
Is it possible to turn on the refrigerator on the balcony in winter?
Technically, you can start it, but manufacturers do not recommend doing this. The oil thickens, the plastic becomes brittle, and moisture from the air can condense inside the system, causing corrosion or a short circuit.
Frequently asked questions (FAQ)
Why does the refrigerator hum, but does not freeze, and what to do?
If the motor is humming, but there is no cold, perhaps there is a freon leak, the capillary tube is clogged or the compressor is broken (does not create pressure). You need to touch the condenser on the back: if it is cold while the engine is running, most likely there is no freon. A call from a technician is required.
How long does it take for the refrigerator to get cold after defrosting?
Usually the process of reaching operating mode takes from 2 to 6 hours. You should not load groceries at this time. If after 6–8 hours of active operation of the compressor the temperature does not drop, it means there is a malfunction.
Is it possible to check the freon level yourself?
No, it is impossible to visually determine the freon level. Indirectly, a leak is indicated by the lack of heating of the condenser grid (it should be warm) and the continuous operation of the compressor. Accurate diagnosis is carried out only with a pressure gauge.
What to do if ice is frozen in the No Frost refrigerator?
It is necessary to completely defrost the unit (at least 24 hours). If, after switching on, ice appears again after 1–2 weeks, it means that the defrosting system (heating element, sensor or timer) is faulty. Operation with ice will lead to compressor failure.
Why does the upper chamber freeze, but the lower one does not?
In two-compressor models, this means a breakdown of the lower compressor or its control circuit. In models with one motor and the No Frost system, the air supply channels are probably clogged or the fan that disperses the cold is not working.