The situation when you open the refrigerator door and feel warm, while in the freezer compartment everything is frozen “to stone”, is a classic sign of a serious technical malfunction. Many users mistakenly believe that if the compressor is humming and the freezer is working, then the problem will solve itself or it is just a matter of thermostat settings. In fact, such an asymmetry in the temperature regime indicates a violation of the refrigerant circulation or a malfunction in the control system.
In normal operation, evaporator should cool both circuits evenly, or cold air should be distributed evenly throughout the No Frost system. When this balance is disturbed, the food in the main chamber begins to deteriorate, unpleasant odors and condensation appear. Understanding the physical processes occurring inside the unit at this moment will help you quickly navigate the nature of the breakdown and not aggravate the situation with incorrect actions.
It is worth noting right away that self-repair in this case is often impossible without specialized equipment, such as a vacuum pump or a pressure gauge station. However, correct initial diagnosis will allow you to accurately describe the symptoms to the technician or decide to call a specialist, avoiding unnecessary costs for unnecessary spare parts. Let's look at the main reasons why refrigerator stops cooling, maintaining frost.
Refrigerant leakage: the most common cause of imbalance
The most likely explanation for the situation is when the freezer is working properly, but there is heat in the refrigerator compartment, partial freon leak. In modern refrigerators with a single compressor, the refrigerant first passes through the freezer circuit, where it releases some of the cold, and then enters the refrigerator circuit. If there is little gas left in the system (for example, 40-50% of the norm), it is only enough for the first stage of circulation.
The compressor continues to work, trying to reach the set temperature, and the freezer copes with this task. However, the refrigerant simply does not reach the main evaporator in the required volume or condition, so no active heat exchange occurs there. You may notice that the compressor is running almost non-stop, trying to compensate for the lack of cooling capacity.
⚠️ Attention: If you suspect a leak, under no circumstances try to solder the pipes yourself or add freon by eye. An incorrect amount of refrigerant or moisture entering the system will cause the compressor to burn out, which will make repairs economically unfeasible.
Often, a leak occurs in the foamed part of the housing or at the pipe connections that are hidden from view. It is rarely possible to visually detect oil stains, so technicians use leak detectors or a nitrogen pressure test method. If your refrigerator is more than 10 years old, the likelihood of microcracks forming in the aluminum of the evaporator increases significantly.
Clogged capillary tube: ice plug or debris
The second most common cause is clogged capillary tube. This unit is a thin copper channel through which freon is supplied to the evaporator under high pressure. If oil oxidation products, moisture or technical debris appear in the circulation system, the tube's patency is impaired. As a result, the pressure in the system drops and the refrigerant cannot circulate effectively throughout the entire circuit.
Often the blockage is seasonal or is associated with moisture ingress during a previous poor-quality repair. Water, freezing at the narrowest point of the capillary, forms an ice plug. This blocks the flow of freon, and the refrigerator stops cooling in the upper compartment, although residual cold from previous operating cycles may still remain in the freezer.
The blockage can be diagnosed by characteristic signs: the compressor is overheating, and the condenser (grid at the back) may be only partially hot or cold. Sometimes you can hear gurgling or hissing, which is replaced by silence, after which the engine starts again.
Is it possible to break through the blockage yourself?
There is a method of “pushing” the blockage with increased pressure, but at home it is extremely dangerous. Without a pressure gauge, you will not be able to control the pressure, which can lead to rupture of pipes or damage to the compressor. In addition, without replacing the filter-drier, the problem will return in a few days.
Malfunction of the No Frost system and fan
In refrigerators with a system No Frost or Frost Free cold is not generated directly in the chambers, but is forced there by a fan from a special hidden evaporator. If you hear that the motor is humming, but cold air does not enter the refrigerator compartment, the problem may lie in the fan stopping If the fan malfunctions or the channels are clogged with ice (due to a breakdown of the defrost heating element or timer) the air flow stops. A freezer located closer to the source of cold can still maintain a low temperature due to static cold, and warm air stops flowing into the main chamber. Often in such cases, you can notice ice on the back wall inside the chamber or under the drawers. or freezing of the air ducts.
If the fan malfunctions or the channels are clogged with ice (due to a breakdown of the defrost heating element or timer), the air flow stops. A freezer located closer to the source of cold can still maintain a low temperature due to static cold, and warm air stops flowing into the main chamber. Often in such cases you can notice frost on the back wall inside the chamber or under the drawers.
- 🌀 Stopping the fan motor: The impeller does not rotate, the air does not circulate, the motor needs to be replaced.
- ❄️ Evaporator freezing: The defrosting heating element does not turn on, ice is blocking the channels, troubleshooting the circuit is necessary defrost.
- 🚪 Loose damper fit: in models with flow control, the damper may jam in the closed position.
To check this version of the malfunction, it is often enough to completely defrost the refrigerator within 24 hours. If after turning on the unit starts to freeze normally, but after 1-2 weeks the problem recurs, then the defrosting system is really faulty and requires replacement of components.
Problems with the compressor: loss of performance
The compressor is the heart of the refrigerator, and its incorrect operation can lead to paradoxical results. In some cases, when compressor valves lose tightness or are stuck, the engine loses the ability to create the necessary pressure to pump freon through the full circuit. The power is only enough to maintain the temperature in the small circuit (freezer), but there is no longer enough pressure for the large circuit (fridge compartment).
Externally, this manifests itself in the fact that the compressor works, vibrates, but the condenser (heat exchanger at the back) remains barely warm or cold, although it should be hot. Also, the engine can quickly heat up and turn off by the thermal relay, not having time to reach the required speed.
Diagnostics of the compressor requires measuring the winding current and discharge pressure. If a loss of performance of the mechanical part is confirmed, compressor subject to replacement. Attempts to revive an old engine with stuck valves usually give a short-term effect.
Failures in the operation of electronics and thermostats
Modern refrigerators are controlled by complex electronics. If you have an electronically controlled model, the reason for the lack of cold in one of the chambers may be a failure of the temperature sensor (thermistor). If the sensor in the refrigerator compartment “lies” and sends a signal to the control module that it is already too cold there, the board will not give a command to open the air damper or turn on the compressor for this zone.
In simpler models with a mechanical regulator, the fault may lie in the thermostat itself. If its sensitive element has moved or the contacts are burnt, the circuit may open prematurely, preventing the refrigerator from reaching operating mode. It’s also worth checking the settings: accidentally turning off the “Vacation” mode or the minimum cooling power can give a similar effect.
⚠️ Attention: Before calling the technician, be sure to check whether you have the “Super Freeze” mode turned on (if you have one) or whether the settings in the menu are not correct. Sometimes the problem is solved by simply resetting the settings to factory settings via
Menu → Settings → Reset.
Comparative table of symptoms and solutions
For ease of diagnosis, we have collected the main symptoms in a table. By comparing the behavior of your unit with the data below, you can with a high degree of probability determine the unit that requires attention.
| Symptom | Probable cause | Action |
|---|---|---|
| The freezer is freezing, the refrigerator is warm, the compressor is running without stops | Freon leak | Call a technician to find the leak and refill |
| The refrigerator hums, then silence, hums again, no cold | Clogged capillary tube | Purge the system, replace the filter-drier |
| You can hear the fan running, but there is no cold, there is ice on the wall | No Frost malfunction (heating element, timer) | Defection of the defrost system, defrosting |
| The compressor is hot, the grille at the back is cold | Loss of compressor performance | Replacement of the compressor |
Algorithm of actions when a malfunction is detected
If you are faced with the problem described, do not panic. The correct sequence of actions will help minimize product losses and speed up repairs. First, make sure that the door is tightly closed and the seal is not damaged, as this may create the illusion that the equipment is malfunctioning.
Then, completely defrost the refrigerator. Unplug it, open the doors and leave it for at least 24 hours (preferably a day). This is necessary to exclude a version with an “air lock” or temporary freezing of the channels. If after turning on the problem returns within 2-5 days, call a specialist.
☑️ Action plan in case of breakdown
Do not try to pick the ice with a knife or other sharp objects if you see ice on the back wall. Damage to the evaporator will turn a simple repair into a complex and expensive procedure to replace the foamed circuit. Take care of your equipment, and it will last a long time.
Why did the refrigerator start working after defrosting, but after a week it stopped working again?
This is a classic sign of a capillary tube being clogged with moisture or a malfunction of the defrosting system. During defrosting, the ice plug melts and the system temporarily returns to normal. However, during operation, moisture or ice builds up again, blocking circulation. The filter-drier needs to be replaced and the system evacuated.
Is it possible to operate the refrigerator if the freezer is freezing and the chamber is warm?
It is possible to operate it, but not for long. The main problem is the compressor operating non-stop, which leads to its overheating and rapid wear. In addition, the food in the refrigerator compartment will begin to spoil. It is better to eliminate the malfunction.
How much does repair cost in case of a freon leak?
The cost consists of the work of the technician, the cost of freon, replacing the filter-drier and finding the leak. If the leak is in the foamed part (in the housing), repairs can be expensive, since it will require installing an external evaporator (“crying” on the back wall).
How can you tell that the compressor has burned out and not just run out of freon?
If the compressor hums, but does not start (you can hear a clicking and buzzing), or if it works, but absolutely If it feels cold to the touch (instead of hot), or if it is hot but does not vibrate, these are signs of problems with the motor. Only measuring the resistance of the windings with a tester will give an exact answer.