The situation when the refrigerator compartment is warm, food begins to spoil, and the freezer continues to freeze as if nothing had happened, causes panic in any home cook. This is a classic symptom indicating poor refrigerant circulation or problems with temperature control. Often, equipment owners immediately prepare for expensive repairs, but in some cases the problem is solved relatively quickly.
To understand why The refrigerator does not workit is necessary to take into account its design features. In single-circuit systems, the freezer compartment is primary, and the cold is transferred to the main compartment through a special channel. If this channel is clogged with ice or air, circulation stops. In dual-circuit models, the situation may be more complicated, since different system components may be responsible for different zones.
You should not immediately open the back wall or call a technician without carrying out an initial diagnosis. Sometimes the reason lies in simple freezing of the evaporator due to a loosely closed door or a malfunction of the defrost sensor. Our task is to consistently eliminate simple options before moving on to complex compressor repair or replacement of freon.
Problems with the No Frost system and evaporator freezing
The most common reason why the main chamber is warm, but there is cold in the freezer, this is a violation of the defrost system in models with No Frost. In such refrigerators, the evaporator is hidden behind a plastic panel, and if the defrost system fails, ice blocks the air supply channels. As a result, the fan moves air, but it simply cannot pass through the ice plug to the shelves of the refrigerator compartment.
The freezing process can take from several days to a couple of weeks, depending on the moisture content of the food and the frequency of opening the doors. At first, you may notice that your refrigerator starts to run longer and louder as it tries to get up to temperature. Then a “snow coat” will appear on the back wall of the main chamber, and the temperature will begin to rise. It is critically important to understand that clogged air ducts ice is not a breakdown of the compressor itself, but a failure in temperature control.
⚠️ Attention! If you find a thick layer of ice on the back wall of the refrigerator, do not try to pick it out with a knife or sharp objects. You risk puncturing the evaporator, which will lead to an immediate release of freon and costly repairs.
Restoring operation often requires complete defrosting of the equipment within 24 hours. This will allow the ice to melt and clear the channels. If after turning on the refrigerator began to freeze normally again, then the problem was cyclic freezing. However, if after a week the situation repeats itself, it means that one of the elements of the defrosting system is faulty: the heating element, timer or sensor.
Malfunctions of the thermostat and temperature sensors
The refrigerator electronics rely on sensor readings. If thermostat fails or starts transmitting incorrect data, the compressor may shut down too early. In this case, the freezer, which has a smaller volume and is often located closer to the source of cold, manages to freeze, and in a large volume of the refrigerator compartment the temperature simply does not drop to the desired values.
In modern models with electronic control, air sensors are responsible for this. They can “lie” due to oxidation of contacts or internal damage. You can check a mechanical thermostat by temporarily closing its contacts (if you have the skills of an electrician), but with electronic modules everything is more complicated. Often it is necessary to replace the element with a new one, since (calibration) at home is impossible.
It is also worth checking the settings. Sometimes users accidentally mess up operating modes by setting the minimum cooling power. In the control interface, the “Holiday” or “Eco” indicator may be lit, which specifically limit the operation of the refrigerator compartment to save energy, keeping the freezer active.
How to check the thermostat with a multimeter?
To check the mechanical thermostat, it must be removed and “ringed” with a tester. At room temperature the contacts should be closed (resistance close to zero). If you put the sensor in the freezer, the circuit should break. Lack of response indicates a malfunction of the part.
Freon leakage and blockage of the capillary system
A more serious reason why the refrigerator does not freezeis related to the refrigerant. Freon circulates in a closed circuit. If a micro-leak occurs (for example, due to corrosion of tubes or a factory soldering defect), the gas pressure is not enough to cool the entire volume. Since the freezer chamber is located at the beginning of the circuit, it receives cold first, and the refrigerant simply “does not reach” the main chamber in the required state.
The second option is a blockage of the capillary tube. An ice plug from moisture or a blockage from wear products of the compressor oil may form inside the system. This physically blocks the freon flow. The symptoms are similar: the compressor works almost non-stop, trying to build up pressure, but there is no cold. In this case, the condenser (grid at the back) may be barely warm or cold in the lower part.
| Symptom | Probable cause | Nature of compressor operation |
|---|---|---|
| The refrigerator is silent | Malfunction of the thermostat or start relay | Does not turn on at all |
| Hums constantly | Freon leak or capillary blockage | Works without interruption |
| It hums for 2-3 minutes and clicks | Failure of the compressor (interturn short circuit) | Tries to start and stalls |
| It hums, but there is no cold anywhere | Full freon leak | Operates normally |
Diagnostics of a leak requires special equipment - a leak detector or a pressure gauge manifold. Visually, you can notice oily stains on the tubes at the back or bottom of the refrigerator where the compressor is located. If you see traces of oil, this is almost guaranteed leakage in the place of corrosion or microcracks.
Problems with the fan and clogging of air ducts
In refrigerator systems No Frost for forced The fan circulates the air. It is located in the freezer and drives cold air through a duct into the refrigerator compartment. If the fan stops, the cold remains in the freezer (where it is created by the evaporator), but does not enter the main compartment.
The reasons for stopping the fan can be different:
- ❄️ Mechanical jamming of the blade with a piece of ice or product packaging.
- ❄️ Exit the fan motor is faulty (the winding is burnt out).
- ❄️ Broken wiring or oxidation of connector contacts.
- ❄️ Blocking the fan operation by the door opening sensor (if it is faulty).
To check the fan, you need to open the freezer door. On many models, when the door is opened, the fan should stop (the limit switch is activated). If you press the limit switch with your finger (simulating a closed door), the fan should start working. If you hear a hum, but the blades do not spin, the fan is jammed. If there is silence, check for voltage at the terminals.
Failure of the compressor and start relay
The compressor is the “heart” of the refrigerator. If it does not work correctly, the entire cooling cycle is disrupted. However, if the freezer is working, it means that the compressor is still pumping freon, although perhaps with less efficiency. Most often in such cases they talk about a loss of compressor performance.
The starting relay is a device that helps the compressor start. If it is burnt or stuck, the compressor may hum but not start, or start and immediately stall. In this case, the freezer will also stop freezing quite quickly. But if the freezer works stablyIf the refrigerator is not, then the relay is most likely in good order, since it ensures the operation of the entire unit.
There is a concept of “weak compressor”. This is a condition when the piston group is worn out and the compressor cannot create the necessary pressure to pump freon through both circuits (if there are two of them) or along the entire length of one circuit. In this case, only replacing the compressor with a new one helps, since repairing the old one is not economically feasible.
⚠️ Attention! Replacing a compressor is a complex procedure that requires evacuation of the system and charging with freon under pressure. This work can be done efficiently only in a service center using professional equipment.
Diagnostics and procedure for detecting a problem
In order not to make mistakes and not to aggravate the situation, act consistently. There is no need to immediately disassemble the refrigerator if you are not confident in your abilities. Start with simple steps that any user can follow.
The first thing to do is listen to the operation of the unit. Is the compressor humming? Is the fan working? Are there any extraneous sounds? Then check the temperature in different zones. If you have a thermometer this will be ideal. Place it in a glass of water on the middle shelf of the refrigerator for 2-3 hours.
☑️ Primary diagnostics of the refrigerator
If after complete defrosting (24 hours with the doors open) the problem does not go away, then it is a technical fault. In this case, you need to call a technician to diagnose the device. You cannot get into the system with freon on your own without pressure gauges and a vacuum sealer.
Frequently asked questions (FAQ)
Is it possible (to continue using) refrigerator, if the top does not freeze, but the bottom works?
Can be used temporarily while you are waiting for the technician or defrosting. However, food in the refrigerator will quickly spoil, which can lead to food poisoning. In addition, if the cause is a freon leak, the compressor will work hard, trying to compensate for the lack of cold, which can lead to its complete combustion.
How much does a repair cost if the cause is a freon leak?
The cost consists of the work of the technician, the cost of freon, filter-drier and soldering. On average, this is 30-50% of the cost of a new budget-class refrigerator. If the refrigerator is old, sometimes it is more profitable to buy a new one than to repair the old one.
Why did the refrigerator work after defrosting, but after a week it stopped again?
This is a sure sign of a malfunction of the defrosting system. Most likely, the heating element of the evaporator burned out, or the defrost sensor or timer failed. Ice accumulated again and blocked the channels. Diagnosis and replacement of the faulty element of the No Frost system is required.
Could incorrect installation of the refrigerator be the cause?
Yes, if the refrigerator is too close to the wall or radiators, the heat transfer of the condenser is disrupted. The compressor overheats and can be switched off by protection before it has time to reach the desired temperature. The gap on the sides for ventilation is also important.