The situation when you open door, and inside you are greeted with room warmth instead of pleasant cold, which can drive any person into a stupor. Externally, the unit behaves absolutely normally: the light is on, the engine is humming, it seems that refrigeration cycle it is running, but the products begin to deteriorate before our eyes. This is a classic symptom of a hidden malfunction, which can be hidden either in a simple overload or in a complex refrigerant leak.
Before calling a technician or panicking, it is important to conduct an initial diagnosis to understand the scale of the problem. Often the reason lies in little things that you can fix yourself in a matter of minutes, without resorting to complex tools. However, ignoring serious signs, such as a continuous hum or a complete lack of cold in one of the chambers, can lead to expensive repairs compressor.
In this article we will analyze in detail all the possible reasons why the equipment has stopped freezing, and we will draw up a step-by-step action plan to restore the functionality of your equipment.
Primary diagnostics: checking the obvious
The very first thing to do is to exclude the human factor and simple external circumstances. Sometimes we ourselves create conditions under which refrigerator cannot effectively perform its function, even if all nodes are working properly. Remember if you overloaded the shelves with hot pots or if you placed the unit close to the wall, blocking the air supply.
Check the tightness of the door. If the sealing rubber is worn out, dirty or simply deformed, cold air constantly leaves outside, and warm air flows in. In this case, the compressor works hard, trying to compensate for heat loss, but physically does not have time to cool the chamber volume to the specified values.
Also pay attention to the position of the temperature regulator. Perhaps one of the household members accidentally moved the knob, or the settings in the electronic unit were disrupted by a power surge. Make sure that the thermostat is set to the correct position corresponding to the current room temperature.
⚠️ Attention: If you notice that the sealing rubber is severely damaged or torn, operating the appliance with the door open can lead to freezing of the evaporator and failure of the compressor due to constant operation.
Problems with the No Frost system and defrosting
Modern models equipped with the system No Frostoften face the problem of the formation of an “ice coat” on the evaporator hidden behind a plastic panel. Unlike older drip systems, moisture should not freeze on the walls, but if the defrost cycle is disrupted, ice blocks air circulation. As a result, the fan drives air, but it simply cannot pass through the ice jam to the products.
The main culprits in this situation are three elements: a defrost heating element, a defrost sensor or a timer (electronic control module). If the heating element burns out, the ice does not melt. If the sensor is faulty, it does not give a command to turn on the heating. And if the timer is jammed, the system is simply “stuck” in cooling mode, ignoring the need to defrost.
You can diagnose this problem by listening to the operation of the fan. If you hear that it is spinning with effort, or makes a strange sound, or is completely silent when the compressor is running, most likely the channels are clogged with ice. In this case, complete defrosting of the equipment within 10-12 hours helps.
☑️ Checking the No Frost system
It is important to understand that if after defrosting the equipment stops freezing again after 1-2 weeks, it means that one of the elements of the defrosting system has failed and requires replacement. It is difficult to change a heating element or sensor on your own without a multimeter, but you can check their resistance if you have basic skills in working with electronics.
Why can’t you chip off ice with a knife?
Mechanical removal of ice with sharp objects is strictly prohibited. You can damage the evaporator tubes through which freon circulates. Repair in this case will require soldering and refilling, which is much more expensive than replacing the heating element.
Malfunctions of the compressor and start relay
The compressor is the heart of the refrigerator, and if it does not work correctly, cooling is impossible. It often happens that the engine hums, trying to start, but after a few seconds there is a click and it goes silent. This is a classic sign of a malfunction starting relay or motor winding.
The starting relay is responsible for supplying voltage to the starting winding of the compressor at the time of start. If the contacts inside the relay are burnt or stuck, the engine cannot reach the required speed. In more severe cases, the compressor itself may be “jammed” mechanically or have an interturn short circuit, which requires its complete replacement.
Another alarming symptom is when the compressor works constantly, without turning off, but there is no cold. This may indicate a loss of piston performance. The motor is humming, freon seems to be circulating, but the pressure required for effective heat exchange is not enough.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| Buzzing for 5-10 seconds, clicking, silence | Start relay or compressor jamming | Medium / High |
| Works constantly, no cold | Compressor wear or freon leak | High |
| The motor housing gets very hot | Interturn short circuit | High (replacement) |
| Buzzes, but does not start (quiet hum) | Low voltage in the network or compressor failure | Medium |
To check the relay, it must be removed and shaken. If you hear a ringing sound inside (as if from broken ceramics), the part definitely needs to be replaced. This is a consumable material that is inexpensive and can be changed quite easily if you have the skills to work with electrical equipment.
Refrigerant leakage and system blockage
If the compressor runs smoothly, without jerking or clicking, but there is no cold in the chambers at all, there is a high probability of a leak. freon. The refrigerant circulates in a closed circuit, and if a microscopic hole has formed in the tubes or condenser, the gas gradually evaporates. Without a sufficient amount of freon, heat simply is not removed from the chambers.
Often a leak occurs in the foamed part of the housing or in the place where the tubes are soldered, where corrosion could form. It is difficult to notice this visually, but an indirect sign can be the lack of heating of the condenser (the grille at the back or the side walls, depending on the model). Normally, they should be warm or hot.
Another common problem is capillary blockage. A blood clot could have formed in the system from oil or moisture oxidation products, which blocked the narrow passage of the capillary tube. There is freon, the compressor is working, but circulation is impossible. In this case, you can often hear gurgling or hissing inside the unit.
⚠️ Attention: It is impossible to independently find the location of the leak or eliminate the blockage of the capillary without specialized equipment (leak detector, vacuum pump, pressure gauge station). Attempts to simply “add gas” without eliminating the cause will lead to repeated breakdown in a short time.
Malfunctions of the thermostat and electronics
In older models of refrigerators, a mechanical thermostat is responsible for the temperature. If its bellows tube has lost its seal or the contacts have oxidized, the compressor may not receive a signal to turn on, even if the chamber is warm. Or vice versa - work without stopping, without reacting to achieving the desired degree.
In modern models with electronic control No Frost The role of a thermostat is performed by temperature sensors (NTC). Their failure often results in error codes appearing on the display, but not always. If the sensor “lies”, showing that it is -20°C inside, although there is +10°C, the control module simply will not start the compressor.
It is also worth checking the integrity of the wiring. Rodents, vibration, or simply time can cause the contacts going to the sensors or fan to break. Visual inspection of wiring harnesses in accessible locations (usually at the top of the camera or behind the rear panel) can sometimes help locate an obvious break.
Electronics diagnostics require testing the sensors with a multimeter for resistance. Normal readings vary depending on temperature and sensor brand, but are typically in the 2-10k ohm range at room temperature. Infinite resistance or a short circuit indicates a malfunction of the element.
When you need to call a professional technician
Despite the desire to save money, there are situations when intervention an amateur can finally finish off a technique. If the problem lies in a sealed circuit (leakage, blockage, compressor replacement), the system must be evacuated and accurately charged with freon by weight. It is impossible to do this efficiently without special equipment.
You should also contact a specialist if, after defrosting yourself and checking the electrical system, the refrigerator still does not freeze. Professional diagnostics using pressure gauges will allow you to accurately say whether there is freon in the system and what pressure the compressor creates.
You should not take risks if you are not confident in your abilities when working with 220V electricity. Repairing complex electronics (control board) also requires a soldering station and deep knowledge of circuit design, since burnt elements on the board are only a consequence, and the cause may be deeper.
How much does it cost to replace a compressor?
The cost consists of the price of the unit itself (from 3,000 to 8,000 rubles depending on the brand) and labor masters (from 2500 to 5000 rubles). You may also need to replace the filter drier and refill with freon. The total amount is often more than 50% of the cost of a new refrigerator, so sometimes it is more advisable to buy new equipment.
Can a refrigerator be used if it does not freeze?
For a short time - yes, as a storage cabinet. But if the compressor runs constantly, this is a fire hazard and leads to its burnout. If it does not turn on at all, storing food at room temperature is only possible for a short time.
Why does the freezer work, but the refrigerator compartment does not?
Most often this is a problem with the defrosting system (the evaporator is clogged with ice) or a malfunction of the damper that regulates the supply of cold air from the freezer to the main compartment. It is also possible that the second compressor fails (if there are two of them) or a freon leak in the refrigeration chamber circuit.
How long should you defrost the refrigerator if ice is suspected?
The minimum time for complete defrosting is 10 hours, optimally - 24 hours. Ice in the hidden channels of the No Frost system can flow very slowly. Do not try to speed up the process with a hairdryer or hot water, this can damage the plastic and tubes.
What to do if, after defrosting, the refrigerator does not freeze again?
If after 24 hours of inactivity with the doors open, the appliance turned on, worked for a couple of hours and stopped cooling again, the problem is not in the ice. Most likely, the defrost system (heating element, sensor) has failed or a freon leak has occurred. A specialist diagnosis is required.