The situation when the ice in the freezer is hard as stone, and in the main compartment food begins to deteriorate, is one of the most frequent and alarming situations for owners of household appliances. Temperature imbalance indicates that the cooling system has stopped functioning normally, although the compressor may continue to hum. Users are often frightened, assuming that the refrigeration unit is completely out of order, but in many cases the problem lies in a violation of the circulation of the refrigerant or an electronics failure.
Understanding how it works refrigeration circuithelps to quickly diagnose a breakdown. The refrigerant (freon) circulates through the tubes, taking heat from the chambers and releasing it outside. If it is cold in one compartment and hot in the other, it means that the refrigerant either does not reach the desired area or cannot work effectively there. In 80% of cases, such a temperature asymmetry indicates a leak freon or clogged capillary tube. Ignoring the first symptoms can lead to complete failure of an expensive compressor.
Before calling a technician, it is necessary to carry out an initial diagnosis, eliminating the simplest and most commonplace causes. Sometimes the problem is solved without opening the technical compartment; it is enough just to properly defrost the unit or reconfigure the operating modes. In this article, we will analyze in detail the mechanical and electrical causes of the malfunction so that you can assess the scale of the disaster.
Problems with the thermostat and temperature sensors
One of the first reasons why refrigerator compartment stops cooling when the freezer is running is the failure of the thermostat. This element is responsible for turning the compressor on and off depending on the temperature inside the chambers. If the thermostat is “stuck” in the “off” position or transmits incorrect data to the electronic module, the compressor may not work long enough to cool the main compartment, but still manage to maintain a low temperature in the freezer.
In modern models with the system No Frost instead of a mechanical thermostat, electronic ones are used sensors (thermistors). They are located at different points in the evaporator and air ducts. If the refrigerator compartment sensor shows an error or excessive values, the “brain” of the refrigerator simply does not give the command to supply cold to this compartment. Diagnosis of such malfunctions requires special equipment for measuring resistance.
Symptoms of a malfunctioning thermostat often manifest themselves in an incorrect operating cycle: the compressor hums in very short intervals or, conversely, does not turn on for hours, although the chamber is warm. In mechanical models, you can try to gently twist the regulator knob to “stir” the contacts. If there is no click and the compressor does not respond, the part most likely requires replacement.
⚠️ Attention: When replacing a thermostat, it is important to use a model with similar temperature characteristics. Installing an unsuitable regulator will lead to incorrect operation of the refrigerator and spoilage of food.
Refrigerant leak: symptoms and consequences
The most common technical reason for the situation “the freezer is working but the refrigerator is not” is partial freon leak. A closed loop is created in the cooling system, and ideally the refrigerant should not disappear anywhere. However, over time, the metal of the evaporator tubes can corrode, especially if the seal is broken or low-quality materials were used in production. When the amount of gas in the system drops, its pressure is only enough to cool the first section of the circuit - usually the freezer.
Freon simply does not reach the refrigeration compartment in the required volume and state of aggregation. At the same time, the compressor works almost without interruption, trying to raise the temperature, but to no avail. You may notice that the condenser grill on the back of the refrigerator is only partially warm or cold. This is a sure sign that the refrigerant the refrigerant is not circulating completely.
The recovery process in this case includes finding the location of the leak (often a foamed evaporator or tubes in the shut-off valves), eliminating the damage and recharging the system. Finding a microcrack on your own is almost impossible without a leak detector. Attempts to simply “refill” the refrigerator without eliminating the hole will only give a temporary effect for a few weeks.
Clogged capillary tube and filter drier
Another common mechanical malfunction that leads to the symptoms described is clogged capillary tube. A capillary is a very thin copper tube in which there is a sharp drop in the pressure of the refrigerant and its transition to a gaseous state with the absorption of heat. Not only freon circulates in the system, but also compressor oil. Over time, oxidation products, paraffin or moisture can accumulate in the oil, which turns into an ice plug.
When the lumen of the tube is blocked, the circulation of the refrigerant stops or becomes very difficult. The pressure before the plug increases, and after it it drops. As a result, the evaporator in the refrigerator compartment remains warm, while the area before the blockage (often located in the freezer) may be cold. At the same time, the compressor operates under increased load, gets very hot and can be turned off by a thermal relay.
To remove the blockage, technicians use the method of pressing with nitrogen under high pressure. If this does not help, the capillary tube and filter drier must be changed. The filter drier is a mandatory element that must be replaced whenever the circuit is opened, as it accumulates moisture and dirt. Ignoring the replacement of the filter will lead to re-clogging as soon as possible.
| Symptom | Probable cause | Nature of compressor operation |
|---|---|---|
| The freezer is freezing, the refrigerator is warm | Freon leak | Works without stopping |
| Temperature everywhere is above normal | Capillary clogged | Buzzes, gets very hot, turns off |
| Refrigerator turned off | Thermostat malfunction | Does not turn on or turns on rarely |
| Ice only at the entrance to the chamber | Fan malfunction | Operates normally |
Faults of the No Frost system and fan
In refrigerators with the system No Frost cold is generated in one place (usually in the freezer behind the plastic panel) and distributed to all compartments using a fan. If you hear that the compressor is running, but no cold is entering the refrigerator compartment, the problem may lie in poor air circulation. Most often, the culprit is fanwhich has stopped rotating due to freezing or engine failure.
Also a common cause is the formation of a “fur coat” on the evaporator, which blocks the air duct channels. This happens if the defrost heating element, defrost sensor or timer is faulty. Ice blocks the air flow and it simply cannot enter the refrigerator compartment. Visually, this can be seen by ice on the back wall of the freezer or the characteristic hum/crackling of the fan trying to break through the ice.
Diagnostics of the No Frost system requires partial disassembly of the inner lining of the freezer. It is necessary to check the resistance of the heating element, the integrity of the wires and the operation of the fan motor. Often it is enough to simply defrost the refrigerator for a day so that the ice melts and the system starts working, but if the reason is a burnt heating element, the problem will return in 1-2 weeks.
☑️ Diagnostics No Frost
Problems with the compressor and start relay
Although the compressor is The “heart” of the refrigerator, its complete stop usually leads to a lack of cold everywhere. However, it also happens that compressor loses its performance. The piston group may wear out, the valves may burn out, as a result of which the compressor hums, but does not create enough pressure to pump freon throughout the entire circuit. In this case, there is pressure only at the beginning of the cycle (freezer), but it does not reach the end (refrigerator).
Another element that often fails is the start-up relay. It is responsible for starting the compressor engine. If the relay is faulty, the compressor may hum for a few seconds, click, and shut off without starting. Or it will start, but work unstable. In some cases, the relay may “burn out,” passing current but not providing normal starting torque.
Replacing a compressor is a complex and expensive repair that requires evacuation of the system and precise charging with freon. It makes sense to change the “heart” of the refrigerator if the unit is relatively new or belongs to the premium class. In older models, the cost of work and spare parts may exceed the residual value of the appliance.
⚠️ Attention: If the compressor is hot to the touch (burns your hand) and the refrigerator does not freeze, immediately unplug the appliance. Further operation in this mode will lead to burning of the motor windings.
Is it possible to replace the compressor yourself?
Theoretically, yes, if you have the skills to solder copper tubes, a vacuum pump and a pressure gauge station. However, without experience, there is a high risk of poor-quality soldering or improper filling, which will lead to rapid breakdown of the new compressor.
Other causes and electrical faults
You should not discount simpler, but unpleasant things. For example, damage sealing rubber on the door of the refrigeration chamber. If the elastic does not fit tightly, warm air constantly enters the chamber. The cooling system simply cannot cope with the volume of heat, although the freezer, the door of which closes hermetically, continues to work normally.
Also in models with electronic control, the cause may be a failure in the control module. The electronics could “glitch” and stop opening the cold air damper into the refrigerator compartment. Sometimes a full reboot helps: unplug the refrigerator for 15-20 minutes, and then turn it on again. If the error was software, the system can recover.
It is important to check the settings. Some modern models allow you to independently adjust the temperature in the compartments or enable a Holiday mode that minimizes cooling in the refrigerator compartment to save energy. Make sure that you have not accidentally activated such functions.
What to do: owner's action algorithm
If you are faced with the problem of lack of cold in the main chamber, do not panic. Act consistently to minimize damage and costs. First of all, assess the amount of food in the refrigerator compartment. If there are a lot of them and they begin to deteriorate, temporarily put the most important things in the freezer or use cold packs.
Next, conduct a visual inspection and listen to the operation of the unit. Pay attention to the nature of the sound of the compressor, the presence of ice in the freezer, and the temperature of the back wall. These observations will help you more accurately describe the problem to the technician over the phone, which can save time on diagnostics.
If simple defrosting for 24 hours did not help, and you see that the compressor runs continuously or, conversely, does not turn on, you need to contact a service center. Repairing the cooling system requires special tools and knowledge.
- 🧊 Defrost the refrigerator completely (at least 24 hours) with the doors open.
- 🔌 Check the tightness of the sealing rubber and the cleanliness of the condenser at the back.
- 👂 Listen: is the fan working inside freezers and is there a characteristic sound of freon bubbling.
- 🌡️ Measure the temperature in the chambers 2-3 hours after switching on to confirm the diagnosis.
Why did the refrigerator work after defrosting, but after a week it stopped again?
This is a classic sign of a clogged capillary tube or the presence of moisture in system. During defrosting, the ice plug in the capillary melts and circulation is temporarily restored. However, during operation, moisture freezes again in the narrowest place, blocking the freon flow. Professional purging of the system and replacement of the filter-drier are required.
Is it possible to operate the refrigerator if the freezer is working and it is warm in the main chamber?
For a short time - yes, so that the food in the freezer does not disappear. However, prolonged operation in this mode is dangerous for the compressor. It works hard, trying to reach an unattainable temperature, which can lead to overheating and eventual failure. It is better to turn off the device before the technician arrives.
How much does it cost to repair such a fault?
The cost depends on the cause. Refilling with freon and finding the leak usually costs more than replacing the thermostat. Replacing the compressor is the most expensive option. The exact price can only be given after diagnostics, since it consists of the cost of spare parts and the complexity of the work (for example, access to a foamed evaporator).
How to extend the life of a refrigerator to avoid such problems?
Do not put hot foods inside, regularly defrost the equipment (if there is no No Frost), keep the condenser grill at the back clean and check the integrity door seal. It is also important to ensure normal ventilation around the refrigerator body.
Is it dangerous to breathe freon vapors if there is a leak?
Modern refrigerants (R600a, R134a) in small quantities contained in a household refrigerator are not toxic to humans during short-term inhalation in a ventilated area. However, R600a (isobutane) is an explosive gas. Therefore, if you suspect a leak, you should not turn on sparking appliances and you need to ventilate the room.