The situation when food is cooled in the main chamber of the refrigerator, and in the freezer compartment the temperature rises above normal, is one of the most common and alarming for owners of household appliances. This is not just inconvenience, it is a direct threat to the safety of stocks of meat, fish and semi-finished products. Compressor at the same time, it can work in normal mode, creating the illusion of serviceability of the entire system, but the circulation of the refrigerant is disrupted precisely in the low temperature circuit.
Frequently users They notice the problem too late, when the ice in the freezer has already begun to melt and water appears at the bottom. At this point, it is important not to panic and not try to immediately disassemble the unit. Primary diagnostics allows you to understand whether you can solve the problem yourself, for example, by defrosting, or whether you need to call a technician for complex repairs No Frost the system. In this article we will analyze in detail the mechanics of the process and the main causes of failures.
It is important to understand that modern two-chamber refrigerators are complex devices where a failure in one unit affects the operation of another. If thermostat reads the temperature incorrectly, it may not give a command to turn on the compressor while the refrigerator compartment is warm, ignoring defrosting the freezer. Let's look at all possible scenarios from simple to complex.
Primary diagnosis and simple causes
Before sounding the alarm and looking for a service center, it is necessary to exclude banal human errors or temporary failures in the operation of electronics. Sometimes the problem lies not in the breakdown of parts, but in improper operation. For example, if you have just loaded a large amount of warm food into the freezer, the system may not have been able to cope with a sudden change in temperature, and the compressor simply has not yet reached the freezing cycle.
The second common reason is a loose door fit. If the rubber seal is worn out or crumbs are stuck on its surface, warm air constantly enters the chamber. In this case, the refrigerator will work hard, trying to compensate for the heat influx, but due to a leak in the airtightness, the required temperature of -18°C may not be achieved. Check the cleanliness of the seal and the tightness of the closure.
It is also worth checking the temperature settings. Perhaps one of the household members accidentally changed the settings in the electronic control unit or turned the mechanical regulator to minimum. Make sure that the “Super Freeze” mode is not activated for too long, as this can lead to the opposite effect - overheating of the motor and temporary system failure.
⚠️ Attention: If the problem does not disappear after defrosting for 10-12 hours, further operation of the refrigerator with loaded food may lead to their spoilage. Do not delay diagnostics.
Problems with the No Frost defrosting system
In refrigerators with a system No Frost or Frost Free moisture does not settle on the walls in the form of frost, but is removed outside the chamber. The evaporator located behind the rear wall of the freezer is responsible for this process. If the heat removal or defrosting system fails, the evaporator becomes coated with ice, which blocks air circulation. As a result, the cold simply does not reach the food, although the compressor hums.
The main element here is Defrosting heating element (heating element). It turns on on a timer and melts the ice on the evaporator. If the heating element burns out, the ice accumulates, turning into a monolith. Air stops passing through the channels, and the freezer compartment stops freezing, while in the refrigerator compartment it may even be too cold or warm, depending on the model.
The defrosting sensor is also responsible for the defrosting process. It tells the control unit that there is enough ice and it’s time to melt it. If the sensor is “stuck” or fails, the command to turn on the heating element simply does not arrive. Visually, this is manifested by the fact that water does not drip from the drainage hole into a special tray above the compressor during the defrosting cycle.
☑️ Symptoms of a malfunction of the No Frost system
Faults in the thermostat and sensors
The thermostat (thermostat) is the “brain” that decides when to turn on and turn off the compressor. In older models this is a mechanical device with a bellows, in new ones it is an electronic sensor. If the thermostat is faulty, it may “think” that the refrigerator is warm and keep the compressor on, or vice versa - think that the cold is sufficient and not start the freezer cooling cycle.
In two-compressor models, each chamber is responsible for its own circuit and its own thermostat. If you have just such a refrigerator, then a breakdown of the freezer thermostat will lead to the fact that it will stop freezing while the main refrigerator is working normally. Replacing the thermostat is a relatively inexpensive and quick procedure.
In electronically controlled systems (where there is a display on the door), the temperature is controlled sensors. If one of the sensors located in the freezer gives incorrect readings (for example, it shows -10°C when it is 0°C), the controller will not turn on the refrigeration. Diagnosis of such faults is only possible using a multimeter and checking the resistance of the sensor at different temperatures.
Often the problem lies in the oxidation of the sensor contacts due to high humidity. In this case, it is enough to clean the contacts, but if the element itself is damaged, it must be completely replaced with an original or compatible analogue.
Refrigerant leak and problems with the compressor
The most unpleasant situation is a leak freon (of refrigerant). The gas circulates in a closed loop, and if a microcrack forms in the tubes (often due to corrosion or mechanical damage), the gas gradually evaporates. First, the coldest part of the circuit stops reaching the farthest part of the circuit - usually the freezer. The refrigerator may continue to operate, trying to gain temperature, but to no avail.
Signs of a freon leak often include hot side walls of the refrigerator (in places where they should be warm, but not hot) or, conversely, the condenser at the back not heating up. The compressor can work almost without interruption, trying to compensate for the lack of refrigerant, which leads to its overheating and eventual breakdown.
If the compressor itself fails, the situation can develop in two scenarios. Either it hums, but does not pump freon (interturn short circuit, jammed pistons), or it does not turn on at all. In dual-circuit systems, one compressor can drive freon in a small circle (refrigerator only) if the solenoid valve for switching circuits is faulty.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| The freezer does not freezes, the refrigerator is working | Clogged capillary tube | High (requires purging) |
| Ice coat on the back wall | Faulty heating element or timer | Medium (replacement of parts) |
| Compressor hot, cold weak | Freon leak | High (search for leaks, refilling) |
| Extraordinary knocking, hum | Compressor wear | High (unit replacement) |
Is it possible to restore the tightness yourself?
It is almost impossible to independently find and solder a freon leak at home. This requires special equipment: nitrogen for pressure testing, a vacuum pump and a refrigerant charging station. Attempts to simply “add gas” without eliminating the leak will give a temporary effect for a couple of weeks.
Clogged capillary tube
The capillary tube is the thinnest channel through which liquid freon under high pressure enters the evaporator. Its diameter is so small that even a microscopic piece of debris remaining after installation, or a product of oil breakdown, can completely block the refrigerant flow. This phenomenon is called “hydraulic blockage.”
When the capillary is clogged, the pressure in the system changes sharply. The compressor is trying to push freon, working with increased load, but there is no circulation. As a result, the evaporator in the freezer compartment remains warm or only cools at the very beginning (at the entrance), and the main part of the chamber does not receive cold. In this case, the refrigerator compartment can freeze normally for some time until the pressure difference is equalized.
The blockage can be diagnosed by a characteristic sign: the filter drier (the metal cylinder next to the compressor) becomes cold or becomes covered with frost, although it should be warm. Uneven heating of the capacitor may also occur. Removing the blockage requires professional purging of the system with nitrogen under high pressure and replacing the filter drier.
⚠️ Attention: Under no circumstances try to break through the blockage by piercing the pipes or using chemical solvents yourself. This will lead to depressurization of the system and complete failure of the compressor.
Action algorithm: what to do right now
If you find that the freezer is not working, first of all estimate the amount of food. If there are few of them and they are not critical, it is better to transfer them to another place or use the fast freezing mode, if it is still functioning. If there is a lot of food, try to close the door as tightly as possible and minimize its opening to keep it cold.
The next step is complete defrosting. Unplug the refrigerator, remove all food and leave the doors open for at least 24 hours. It is better to keep it turned off for a day so that all the ice in the hidden channels of the evaporator has time to melt. Often after such a procedure, the refrigerator begins to work properly, if the cause was an ice jam.
After defrosting, turn on the empty refrigerator and listen. Will the compressor start? Will the freezer become cold after 30-40 minutes? If it gets cold, you are lucky, the problem was in the defrost system. If after an hour of operation the temperature does not drop and the compressor is hot, the problem is more serious (freon, compressor, blockage).
When you need to call a specialist
There are a number of situations when independent repairs are not only useless, but also dangerous. If you hear the compressor start relay clicking, but the compressor itself does not turn on, or if the engine hums for a few seconds and turns off, these are signs that the start relay or the engine itself is faulty. Here you need to replace parts and, possibly, install a new compressor.
A technician is also needed if a freon leak is suspected. The specialist uses a leak detector, finds the leak, seals it, replaces the filter drier and charges the system with the exact amount of refrigerant according to the model’s technical data sheet. It is impossible to independently determine the type of freon (R600a or R134a) and its dosage without experience.
You should not ignore problems with electronics. If error codes are displayed on the display (for example, F1, E2, etc.), this is a direct signal of a failure of the sensors or control board. Attempts to “treat” the board with shock or heat can lead to a short circuit and fire.
Prevention and extension of service life
To avoid a repetition of the situation, monitor the condition of the seals. Wipe them with a soft cloth and check the fit with a sheet of paper: if the paper is pulled out of the closed door without force, the seal needs to be changed or the hinges adjusted. This will reduce the load on the system No Frost.
Do not load hot or warm foods into the freezer. This creates excess humidity, which instantly turns into ice on the evaporator, accelerating wear on the heating element and timer. Allow the food to cool to room temperature before freezing.
Carry out preventive defrosting regularly, at least once a year, even if you have a system No Frost. This will help remove micro-ice in hard-to-reach places and check the operation of the drainage system. A clean refrigerator works more economically and lasts longer.
Why did the refrigerator work after defrosting, but after a week stopped freezing again?
This is a classic sign of a malfunction of one of the defrost system components (heating element, defrost sensor or timer). Defrosting removes the effect (ice), but not the cause. Ice builds up again, blocking the air channel, and the cycle repeats. The faulty part needs to be replaced.
Is it possible to operate the refrigerator if the freezer does not work, but the refrigerator does?
For a short time - yes, if you set the thermostat to maximum so that the food in the main chamber does not disappear. However, the compressor will work hard, trying to achieve the unattainable, which can lead to its combustion. Long-term operation in this mode is not recommended.
How long should an empty refrigerator cool down after switching on?
Usually it takes 2 to 4 hours to reach the temperature in an empty chamber. The freezer should reach sub-zero temperatures within 1-2 hours. If after 5-6 hours of operation of an empty refrigerator the freezer is warm, there is a technical malfunction.
What does humming, but no cold mean?
If the compressor is humming, but there is no cold, this may mean: a freon leak (the gas is gone, there is nothing to pump), compressor breakdown (it hums, but the pistons are not walk) or clogged capillary system. In any case, diagnostics by a specialist is required.
Why is there ice in the freezer, but the food is warm?
This means that the air circulation is impaired. Most likely, the air duct is frozen or the evaporator is clogged with ice due to a malfunction of the defrost system. Cold is produced, but does not enter the chamber volume to the products. It is necessary to defrost and check the heating element.