The situation when the freezer freezes food properly, and the main chamber is at room temperature, is one of the most common and alarming for owners of household appliances. Temperature violation in the refrigerator compartment can lead to rapid spoilage of food, while in the freezer everything remains hard as a rock. This contradiction is often confusing, since it is logical to assume that if one unit is working, then the entire system is working.
However, modern units are structurally more complex than it seems at first glance. In models with No Frost and full systems No Frost one compressor is often responsible for cooling both compartments, but the distribution of cold is regulated by a complex system of dampers, fans and sensors. If you are faced with the fact that the refrigerator does not coolbut the freezer is working, the problem may lie either in banal icing of the channels or in a serious refrigerant leak.
Before calling a technician, it is necessary to carry out an initial diagnosis in order to understand the scale of the disaster. Often the cause is not the breakdown of expensive components, but improper operation or malfunction of the electronics. In this article, we will analyze in detail all possible causes, from simple to complex, and will tell you in which cases it is possible do-it-yourself repair, and when you can’t do without a specialist.
Malfunction of the thermostat or temperature sensor
One of the first reasons, why the refrigerator has stopped cooling in the main compartment is the failure of the thermostat (thermostat) or electronic temperature sensor. This element is responsible for reading the temperature inside the chamber and sending a signal to the compressor to turn it on or off. If the thermostat is “stuck” in the “off” position or the sensor transmits incorrect data that it is already cold in the chamber, the compressor simply will not start to cool the refrigerator compartment, continuing to work only for the freezer (in two-compressor models) or not working at all until the freezer thaws.
In models with electronic control, this process is responsible temperature sensor, which may fail due to oxidation of contacts or internal breakage. Mechanical thermostats, in turn, have a capillary tube, which loses sensitivity over time. If you notice that the unit is not working correctly, it is worth checking the settings and condition of these elements.
To diagnose a mechanical thermostat, you can try to gently knock on it handle or temporarily close the contacts (experienced users only!) to check whether the compressor will start. In electronic models you will need multimeter to test the sensor. If the resistance of the sensor does not change with temperature changes, it must be replaced.
Problems with the No Frost system and fan
In refrigerators with the system No Frost cold is produced in the evaporator, which is usually located behind the back wall of the freezer, and then distributed in both compartments using a fan. If the freezer is freezing everything is fine, but the refrigerator compartment is warm, this often indicates that the cold air is simply not reaching its destination. The main reason is the fan stopping or freezing of the air ducts.
The fan may stop due to a burnt-out motor winding, ice jamming of the blades, or a faulty control board. When the fan is not running, cold air stagnates in the freezer, cooling it intensively, but does not circulate into the upper chamber. You may hear the motor humming, but not hear the sound of the fan running, or there will be complete silence.
How to check the fan?
To check the fan, you need to remove the back panel in the freezer. Turn the blades by hand - they should rotate freely. Then apply power to the motor (observing polarity). If it does not spin or makes a grinding noise, replacement is required.
Another option is evaporator freezing and channels. If the defrost system (heating element, timer, defrost sensor) does not work correctly, a “coat” of ice builds up on the evaporator, which blocks the air outlet holes. As a result, the fan may even hum, trying to expel air, but physically will not be able to do this due to the ice blockage. In this case, complete defrosting of the unit is required within 24 hours.
Malfunction of the temperature regulator damper
In modern models, especially with the system Total No Frost or Multi Flow, it is responsible for supplying cold to the refrigeration compartment special damper (damper). This is a mechanical or electric damper that opens at the command of the electronics, allowing cold air from the freezer into the upper chamber, and closes when the desired temperature is reached. If the damper is jammed in the closed position, cold air physically cannot enter the refrigeration compartment.
The reasons for the damper malfunction are varied: from mechanical jamming by ice to the combustion of the drive motor or the breakdown of plastic gears inside the mechanism. Visually it looks like this: the freezer is operating normally, the food there is frozen, and the refrigerator is as warm as the room. The electronics may not even generate an error if the temperature sensor in the chamber itself has not yet registered a critical increase.
☑️ Damper diagnostics
Often owners try to solve the problem by simply setting the minimum temperature, but if the damper is mechanically blocked, this will not help. It is necessary to remove the panel, usually located at the top of the rear wall of the refrigerator compartment, and check the mechanism. If the damper is frozen, defrosting will be required. If the mechanism is broken, only replace the unit.
Freon leak or clogged capillary tube
A more serious reason why the refrigerator does not coolbut the freezer is working is a partial leak of refrigerant (freon) or clogged capillary tube. In such cases, the compressor works continuously, trying to increase the temperature, humming louder than usual, but there is not enough cold for two compartments. Since the freezer is located closer to the beginning of the evaporator circuit, it “snatches” all the residual cold, leaving the refrigerator compartment without cooling.
When freon leaks, the pressure in the system drops. The refrigerant boils and evaporates at the very beginning of the circuit (in the freezer), before reaching the evaporator of the refrigeration chamber. Signs of a leak may include a hot condenser (grid at the back), a running compressor, but a cold or slightly warm back wall inside the refrigerator. Sometimes you can notice a swelling of the wall inside the chamber.
Clogged capillary tube gives a similar picture. Oil and freon circulate in the system, but a plug forms due to moisture or oil breakdown products. The pressure before the plug increases, after it drops. The compressor tries to push through this plug, working for wear. It is impossible to eliminate a leak or blockage on your own: you need to evacuate the system, replace the filter-drier and refill with new freon.
Reduced compressor performance
The compressor is the heart of the refrigerator. If it motor resource comes to an end, it may lose its performance. The piston group wears out, compression drops, and the unit is no longer able to create sufficient pressure to circulate freon throughout the entire circuit. In such a situation, as in the case of a leak, the farthest point of the circuit, the refrigeration compartment, is the first to suffer.
The freezer, being at the beginning of the cycle, still receives enough cold to freeze, but its intensity is no longer sufficient to fully cool the upper compartment. In this case, the compressor can work almost non-stop, become very hot and consume more electricity. Only a master can diagnose a decrease in compression using a pressure manifold.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| The compressor is silent, there is no light | Problems with wiring or socket | Low |
| Buzzes, but does not start | Faulty start relay | Medium |
| Works without stopping, no cold | Freon leak or blockage | High (needs a technician) |
| The freezer is freezing, the refrigerator is warm | The damper, fan or thermostat | Average |
If you notice that the refrigerator has started to operate louder, and the temperature in the main chamber has begun to “float” or slowly rise, this may be a harbinger of an imminent compressor failure. In some cases, replacing the start relay helps, but if the mechanical part is worn out, it will be necessary replacement of the compressor.
Failure of the door seal
It would seem like a simple problem, but a refrigeration chamber door that does not close tightly can cause the unit to not have time to cool. If sealing rubber (the cuff) is worn out, dirty or deformed, warm air from the room constantly enters the chamber. The compressor tries to compensate for heat loss, working at the limit of its capabilities, but in the freezer the cold is retained better due to the smaller volume and frequent opening of the refrigeration door.
You can check the tightness using a sheet of paper. Clamp the sheet with the door around the perimeter. If it is removed without effort or falls out on its own, the seal is broken. Also visually inspect the rubber for cracks, tears and sticky residue. Dirt on the seal prevents a tight seal.
⚠️ Attention: If the seal is simply dirty, wash it thoroughly with warm water and soap. If the rubber has hardened or lost its elasticity, you can try to restore it by heating it with a hairdryer and straightening it, but it will be more effective to replace the seal with a new one.
The constant flow of warm air leads not only to poor cooling, but also to increased formation of condensation and ice build-up on the back wall, which can ultimately block the water drainage channels and aggravate the problem.
What to do: step-by-step algorithm of actions
If you find that The refrigerator is not cooling, do not panic. Follow a logical algorithm to rule out simple causes or understand the severity of the breakdown. First, make sure that the unit is connected to the network and the voltage is stable. Then listen to the operation of the motor.
If the motor is humming, but there is no cold, check the thermostat settings. Perhaps one of the household members accidentally moved the handle or changed the settings in the electronic menu. Make sure that the food does not block the ventilation holes inside the chamber.
Is it possible to use a refrigerator with a non-working chamber?
You can use a refrigerator in which one of the compartments does not work, you can temporarily (1-2 days) to store products that do not require deep freezing or strict cold. However, prolonged operation with a malfunction can lead to compressor failure due to overload.
If simple measures do not help, completely defrost the refrigerator. Unplug it, open the doors and leave it for at least 12-24 hours. This will help if the problem was hidden icing of the channels or damper. If, after putting it back into operation, the problem recurs a few days later, you need to call a specialist.
⚠️ Attention: Never try to disassemble the pipeline system yourself or seal freon leaks without a license and equipment. This is life-threatening and can permanently damage the equipment.
Frequently asked questions (FAQ)
Why doesn’t the refrigerator get cold after defrosting?
If after defrosting the refrigerator turned on, worked for a while, but stopped cooling again (especially in the upper chamber), this indicates that the reason is not ice, but due to component failure. Most likely, the problem is a freon leak, a clogged capillary system, or a malfunction of the fan/damper, which is again blocked by ice due to incorrect operation of the defrost system.
Is it possible to operate the refrigerator if the upper chamber does not cool?
Short-term - yes, if the compressor does not work for wear (not overheats and does not hum continuously). However, you cannot store perishable food in a warm chamber. Long-term operation with a faulty cold distribution system or freon leak will lead to overheating and combustion of the compressor, which will make repairs economically unfeasible.
How much does it cost to repair if the refrigerator stops cooling?
The cost depends on the reason. Replacing the thermostat or fan will cost the least. Freon refilling and leak detection are more expensive. The most expensive repair is replacing the compressor. The exact amount can only be given after diagnostics by a technician on site.
How can you tell that the compressor has burned out?
If the compressor hums, clicks, but does not start, or it starts, runs for a few seconds and turns off with a click - these are signs of problems with the starting relay or the motor itself. If it is silent and does not respond to switching on, the winding may have burned out. The technician will make an accurate diagnosis using instruments.