The situation when you open the refrigerator door, and instead of pleasant cold you are greeted by warm air at room temperature, is critical for the safety of food. If the thermometer shows about 20 degrees, this means that refrigeration circuit has completely stopped performing its function, and the camera has turned into an ordinary closet. In most cases, such a temperature jump does not occur instantly, but is the result of gradual degradation of the system or a sudden failure of a key node.
The first step is to assess the scale of the problem: is one compartment not working or has the temperature increased throughout the entire device? In modern two-chamber models with a system No Frost failure of one evaporator can lead to defrosting of the entire volume, while in old single-compressor units with a drip defrosting system, heat from the freezer can partially compensate for the lack of cold in the main chamber, but not to a level of 20 degrees. A temperature of 20°C indicates complete equalization of the internal climate with ambient temperature, which indicates long-term downtime or a serious malfunction.
Do not panic, but you need to act quickly, since under such conditions bacteria begin to multiply exponentially. Further actions will depend on whether the sound of the motor is heard, whether the light is on and whether there is any extraneous noise. Below we will analyze a detailed algorithm of actions that will help you diagnose the breakdown and, possibly, fix it on your own, without immediately resorting to the costly services of service centers.
Primary diagnostics and power check
Before disassembling the unit or calling a technician, it is necessary to exclude trivial, but often overlooked reasons for the lack of cold. If the refrigerator is 20 degrees, this may mean that the compressor simply does not receive the command to start or physically cannot turn on due to a lack of voltage. Check whether the plug is firmly inserted into the socket and try connecting the device to another power source to exclude a malfunction of the electrical network itself.
Pay attention to the control panel: if the indicators do not light up, the problem may lie in a power surge that knocked out the machine or damaged it. control module. In some models of refrigerators Indesit or Atlant during power surges, the fuse on the board burns out, which is why the unit stops responding to any commands, while remaining connected to the network.
⚠️ Attention: If you smell a burning smell or see blackening in the outlet area or on the plug, stop trying to turn it on immediately! This may indicate a short circuit in the wiring of the refrigerator itself, which creates a risk of fire.
It is also worth checking the condition of the power cord along its entire length. Often, pets or mechanical damage damage the integrity of the insulation, which leads to an open circuit. If the cable is visually intact, but the refrigerator does not turn on, the connector or the internal wiring of the device may be faulty.
☑️ Primary electrical check
Analysis of the operation of the compressor and start relay
The compressor is the heart of the refrigerator, and if it doesn’t work, there will be no cold anywhere. Go to the unit and listen: if you hear a quiet hum, which ends abruptly with a click, and repeats every few minutes, this is a classic symptom of a malfunction start relay or jamming of the piston group. In normal mode, the motor should operate cyclically, but the operating cycles should be long enough to cool the chambers.
If the compressor is silent, but the light inside is on, and you are sure that there is electricity, the problem may be in the thermostat or electronic module, which simply does not send a signal to start. In older models with mechanical control, the thermostatis responsible for this process, which physically opens the contacts when the desired temperature is reached. If its capillary tube is damaged or has lost sensitivity, the circuit will not close.
In modern inverter models, the situation is more difficult to diagnose, since there is no characteristic click of the relay. If the inverter compressor does not start, an error code often lights up on the display, which can be deciphered in the instructions. For example, for refrigerators Samsung or LG the combination of blinking indicators may specifically indicate an error in the inverter board.
How to check the starting relay yourself?
To check the relay, it must be removed from the compressor (after first disconnecting the refrigerator from the network!). Shake the relay: if it rattles inside like a rattle, it means it is broken and needs to be replaced. This is the most common and cheapest reason why the motor cannot start.
Problems with the refrigerant: freon leak
If the compressor runs continuously without turning off, hums smoothly, but there is no cold, and the temperature in the refrigerator is 20 degrees, most likely it has occurred refrigerant leak. Freon circulates in a closed loop, and if a microcrack forms in the tubes, the gas escapes and the pressure in the system drops to atmospheric pressure. Without pressure, the refrigerant cannot boil and take away heat.
A leak can occur in several places: in the foamed part of the case (where the tubes run inside the walls), in the condenser on the rear grille, or in solder joints. Often a sign of a leak is a bulging back wall inside the refrigerator compartment or the appearance of rust on the metal trim at the back of the unit. In dual-circuit systems, the leak can only be in one circuit, so the freezer may freeze, but the main chamber cannot.
| Symptom | Probable cause | Required actions |
|---|---|---|
| The compressor is hot, but not starts | Motor jamming or winding burnout | Replacing the compressor |
| The compressor runs constantly, there is no cold | Freon leakage or capillary blockage | Searching for leaks, evacuation, refilling |
| A gurgling or hissing sound is heard | Freon residues in the system or air | Diagnostics of circuit tightness |
| Condenser (rear grille) is cold | Lack of refrigerant circulation | Checking the compressor and filter drier |
It is impossible to eliminate a freon leak on your own, since this requires special equipment: a vacuum pump, a pressure gauge station and scales for gas dosing. Attempts to simply “add” freon without finding and eliminating a hole in the system will give only a temporary effect, after which the gas will leave again.
Malfunctions of the defrosting system (No Frost)
In refrigerators with the system No Frost a temperature of 20 degrees can occur due to the fact that the evaporator is completely clogged ice and "fur coat". In such models, the cold is produced in a hidden evaporator, and a fan circulates air through the chambers. If the defrost system (heating element, timer, defrost thermostat or sensor) fails, ice blocks the channels and cold air stops flowing into the chamber.
To test this hypothesis, carefully inspect the back wall inside the refrigerator compartment. If you see ice, lumps of ice, or just the wall feels warm to the touch, although the compressor is running, it means the air circulation is impaired. In this case, the fan may either hum, trying to break through the ice plug, or not work at all due to freezing of the blades.
Often in such cases, completely defrosting the refrigerator within 24 hours helps. This will allow the ice to melt and clear the channels. If after switching on the cold appeared, but a week later the situation repeated, it means that one of the elements of the defrost system (most often defrost heating element or the defrost sensor) is faulty and requires replacement.
⚠️ Attention: Never try to pick out ice with a knife or sharp objects! You can break through the aluminum evaporator, which will lead to an instant release of freon and expensive repairs comparable to buying a new refrigerator.
Clogged capillary tube
Another technical reason why there may be 20 degrees in the refrigerator is clogged capillary tube. This is a thin copper tube in which the refrigerant is throttled. Over time, oil oxidation products, paraffin or moisture can accumulate inside it, turning into an ice or mud plug.
The symptoms of a blockage are very similar to a freon leak: the compressor works constantly, trying to pump gas, but there is no cold. However, if you put your hand on the condenser (the grill at the back), you will notice that it is heated unevenly: part is warm, and part remains cold. Also, the compressor itself may overheat more than usual due to operation in overload mode.
To eliminate this malfunction, a refrigeration technician is required. The procedure includes purging the system with high pressure nitrogen, replacing the filter drier and refilling with freon. It will not be possible to clean the capillary yourself without equipment, since it requires the creation of excess pressure, which is dangerous at home.
The influence of external factors and operating rules
Sometimes the cause of warm air lies not in a breakdown, but in improper operation. If the refrigerator is located close to a wall or in a niche where air circulation is impaired, the condenser cannot efficiently transfer heat. As a result, heat transfer it is broken, and the unit stops cooling, especially in the hot season.
It is also worth checking the rubber seals on the doors. If they are worn out, dirty or the door is warped, warm air from the room constantly enters the chamber. The compressor tries to compensate for heat loss, working hard, but cannot cope with the volume, and the temperature rises to room temperature.
Check whether the refrigerator is loaded too tightly. If the products block the outlet openings of the air ducts (in models with No Frost), the cold simply cannot spread throughout the chamber volume. Air should circulate freely between the products.
How to check the tightness of the door?
Pinch a sheet of paper between the door and the body in different places around the perimeter. If the sheet is removed too easily without resistance, it means that the seal does not hold in this place and requires replacement or adjustment.
Frequently asked questions (FAQ)
Is it possible to store food if it was 20 degrees in the refrigerator?
Unfortunately, if the temperature was kept at 20 degrees more 2-4 hours, most perishable foods (meat, dairy products, fish) have already begun to spoil. Bacteria multiply very quickly at this temperature. It is better to throw away meat and fish, vegetables and fruits can be thoroughly washed and inspected, but the risk of poisoning remains high.
How long will it take for the refrigerator to get cold again after repair?
After eliminating the malfunction (filling with freon, replacing the compressor), the refrigerator usually takes from 2 to 6 hours to return to operating mode. At this time, it is not recommended to load it with food so as not to create an additional heat load.
Why does the refrigerator not turn on after defrosting?
If after defrosting the refrigerator is silent, the thermal compressor protection relay may have tripped due to overheating, or moisture has gotten into the electrical contacts. Let the unit stand unplugged for a few more hours in a dry room. If this does not help, the starting relay or the compressor itself could burn out.
Is the smell of freon dangerous if there is a leak?
Modern refrigerants (isobutane, freon R600a) themselves are not toxic to humans in small concentrations, but they are flammable. However, if the leak occurs due to the burnout of the evaporator tube along with the oil, there may be combustion products in the air that are harmful. Be sure to ventilate the room.