The situation when it is warm in refrigerator compartment , but the freezer continues to freeze like nothing has happened, often takes you by surprise. You open the door to the main compartment and it's room temperature, the food starts to spoil while the frozen stuff at the top (or bottom) remains solid. This is not just an annoying malfunction, but a clear signal about a violation of the refrigerant circulation or a malfunction in the temperature control system.
Many users mistakenly believe that if the compressor is humming and the freezer is cold, then the equipment is working and the problem will solve itself after defrosting. However modern two-chamber units they are more complex than older models, and such a symptom indicates a specific node that requires intervention. Ignoring the problem at an early stage can lead to complete failure of an expensive compressor.
In this article we will analyze in detail the mechanics of the cooling process, explain why the cold stops flowing into the main compartment, and help determine whether you can fix the problem yourself or whether you will need to call a technician with equipment for it. refilling with freon.
The principle of operation of a two-chamber refrigerator
To understand the essence of the breakdown, you need to briefly refresh your memory of the theory. Most modern models are used single-compressor circuit with one evaporator located in the freezer. The refrigerant (freon), passing through the evaporator, takes heat and turns into gas, after which the compressor compresses it and sends it to the condenser, where the gas cools and becomes liquid again.
The key point is that the cold in the refrigeration compartment is not generated separately. It comes there is redirected from the freezer. In systems with No Frost a fan is responsible for this, which drives cold air through special channels. In drip systems (crying evaporator), the cold is transmitted through a common wall or through tubes surrounding the chamber.
If you you see that only the freezer is working, this means that the cooling cycle has started, but the chain of cold transfer to the upper (or lower) chamber is broken. This may be due to both a physical blockage of air flow and a lack of refrigerant to cool a large volume.
Freon leak: the most common cause
The most common reason for the situation when freezer compartment works, but the refrigerator is warm is a partial leak of refrigerant. Freon circulates in a closed circuit: first it passes through the freezer evaporator, cooling it, and only then enters the refrigeration compartment circuit. If a microcrack has formed in the system and the amount of gas has decreased, there is simply not enough gas for the second stage of the cycle.
The gas manages to cool the evaporator of the freezer, but it no longer reaches the main compartment in the required volume or at the required temperature. As a result, the compressor works almost non-stop, trying to gain temperature, but the sensor in the refrigeration chamber does not detect cooling and does not give a command to turn off.
⚠️ Attention: It is impossible to independently find the location of a freon leak without special equipment (leak detector, nitrogen, vacuum pump). Attempts to simply “refuel” the refrigerator without eliminating the cause of the leak will lead to repeated breakdowns after a few days or weeks.
Leak symptoms often appear gradually. At first, you may notice that the compressor starts to turn on more often or runs longer. Then the “tear” (condensation) stops appearing on the back wall of the refrigerator compartment, and the food begins to thaw. If you ignore these signs, after a while the freezer will stop freezing.
- ❄️ The compressor hums continuously or with very short pauses.
- ❄️ In the refrigerator compartment the temperature is higher than +10...+15°C, although the minimum is set.
- ❄️ The condenser (rear grill or side walls) is only partially or unevenly warm.
- ❄️ The evaporator in the freezer is covered with an uneven layer of frost or snow.
Malfunction of the thermostat or sensor
The second most popular culprit is this thermostat (in mechanical models) or air temperature sensor (in electronic). These elements are responsible for temperature control. If the sensor installed in the refrigerator compartment fails and shows incorrect data (for example, that it is already cold there), it does not give the command to the compressor to turn on for cooling.
However, in the scenario “only the freezer is working,” the opposite situation is more common: the sensor “thinks” that there is no cold, and keeps the compressor turned on constantly, but due to another malfunction (for example, the same leak or a clogged capillary), the cold does not flow. Or the sensor in the freezer (defrost) is faulty, and the system does not understand when it needs to start the cooling cycle.
In electronically controlled refrigerators, the sensor itself often fails. control module. It may incorrectly read sensor readings and incorrectly distribute the operating time of the compressor or fan activation. Diagnosis of such breakdowns requires a multimeter and knowledge of electrical engineering.
Checking the thermostat in mechanical refrigerators is sometimes possible manually. If the compressor does not respond when you turn the control knob to the “Maximum” position or lightly tap it, this may be the problem. But an accurate diagnosis will be made only by testing the contacts with a tester.
Problems with the defrost system (No Frost)
In the systems No Frost a proper defrost cycle is critical. If the defrost heating element, defrost temperature sensor or timer (defroster) is faulty, the evaporator in the freezer becomes covered with a thick layer of ice. This ice blocks the operation of the fan, which should drive cold air into the refrigerator compartment.
As a result, it can be very cold in the freezer (since the evaporator is there), but the air does not circulate. The refrigerator compartment remains warm. Users often notice that air has stopped blowing from the openings of the air ducts, or they can hear the fan humming, but there is no air - its blades rest against something (ice).
You can diagnose this problem by completely defrosting the refrigerator. If after 24 hours of defrosting (with the doors open) the equipment worked normally, but after a week or two the situation repeated itself, it means that the defrosting system is not functioning. You need to check the chain: timer -> heating element -> defrost sensor.
- 🧊 Freezing of a “coat” or block of ice on the back wall of the freezer.
- 🧊 The fan is humming, but there is no airflow.
- 🧊 The refrigerator rarely turns on, but it is warm inside (due to the fact that the ice does not allow the cold to pass through).
- 🧊 You can hear the cracking of ice or the grinding of the fan when starting up.
Clogged capillary tube
Another technical reason why refrigerant circulation is disrupted — clogged capillary tube. During operation, a clot could form in the system from oil breakdown products, paraffin plug, or moisture that turned into an icy crystalline structure. This prevents the normal flow of freon.
When clogged, the pressure in the system changes. The compressor tries to push gas, works with overload, but the cooling efficiency drops. Often in such cases, the freezer still has time to freeze the food, since it is closer to the beginning of the cycle, and the refrigerant reaches the refrigeration compartment barely warm or does not reach at all.
⚠️ Attention: Attempts to clean the capillary yourself with compressed air or nitrogen without vacuuming the system can drive moisture or dirt even deeper, which will require replacing the entire evaporator or capacitor.
Symptoms of a blockage are often similar to a freon leak: long compressor operation, insufficient cooling. Only a specialist can distinguish one reason from another by looking at the pressure in the circuit and the temperature in different sections of the tubes. If the tube in front of the filter-drier is hot, and after it is cold, there is an obvious blockage.
Failure of the compressor
Although less common, loss of the compressor itself also happens. The motor may hum, creating the appearance of work, but not create enough pressure to pump freon throughout the entire circuit. In this case, the gas circulates only in a small circle (inside the freezer or even just in the condenser), without reaching the evaporator of the refrigeration chamber. by compression the compressor itself. The motor may hum, creating the appearance of work, but not create enough pressure to pump freon throughout the entire circuit. In this case, the gas circulates only in a small circle (inside the freezer or even just in the condenser), without reaching the evaporator of the refrigeration chamber.
The loss of compression can be determined by hearing and by temperature. If the compressor is running, but the condenser (tubes at the back) is barely warm or cold, and the tube at the outlet of the compressor (high pressure) does not heat up, this is a bad sign. This is also indicated by a quiet hissing or absence of the characteristic sound of gas flowing in the evaporator tubes.
Replacing a compressor is a complex and expensive repair that requires soldering, vacuuming and precise charging with freon. In old refrigerators, the cost of such repairs can be comparable to the price of new equipment, while in modern models it often makes sense to restore the unit.
Is it possible to drive with a faulty compressor?
Transporting a refrigerator with a faulty compressor is permissible, but only in an upright position. If the compressor is “smoking” or has mechanical damage, shaking during transportation can completely finish it off. Before transportation, be sure to secure the compressor with transport bolts, if they are still present.
Diagnostics and table of symptoms
To make it easier for you to navigate the situation before calling a technician, we have compiled a summary table of symptoms. Pay attention to the combination of signs - this is what helps a professional make an accurate diagnosis remotely.
| Symptom | Probable cause | Nature of compressor operation | Difficulty of repair |
|---|---|---|---|
| Heat in the refrigerator, the freezer is freezing | Freon leak / Clogged | Works without stopping | High (needs a technician) |
| Warm everywhere, but the lights are on | Burned compressor / Start relay | Does not turn on or clicks | Medium/High |
| Ice in the freezer, warm in the refrigerator | Faulty defrost system (No Frost) | Works cyclically | Average (replacement of heating element/sensor) |
| Temperature floats chaotically | Temperature sensor / Thermostat is faulty | On rarely or often | Low/Medium |
For initial diagnostics, you can use a simple method: listen to the operation of the unit. If you hear gurgling or hissing inside the chambers, this is a good sign, which means the freon is moving at least a little. If there is deathly silence when the engine is running, there may be a blockage or lack of freon.
☑️ Initial check before calling a technician
What can you do yourself?
If you find that refrigerator compartment it is not cooling, do not rush to panic. There are a number of actions that can be performed without special tools. First, make sure the door closes tightly. Check the seal for cracks, dirt or deformation. Warm air sucked in from outside can overload the system.
Secondly, try complete defrosting. Unplug the appliance, remove all food and leave the doors open for at least 24 hours (preferably 24 hours). This will help if the problem was ice blocking the channels, or oil “sticking” in the compressor. After turning on, let the refrigerator operate for 2-3 hours without loading food.
⚠️ Attention: Do not use a hairdryer, knife or hot water to speed up defrosting! Mechanical damage to the evaporator (especially in No Frost models, where it is hidden behind plastic) will lead to an instant leak of freon and expensive repairs.
If after defrosting the refrigerator starts working, but after 3-5 days the situation repeats, it means the defrosting system (heating element, sensor or timer) is faulty. If defrosting did not help at all, and the compressor hums in vain, most likely there is a freon leak or a blockage. In this case, you cannot do without the intervention of a service center.
Frequently asked questions (FAQ)
Why after defrosting the refrigerator stopped cooling again in a couple of days?
This is a classic sign of a malfunction of the automatic defrosting system in models No Frost. The heating element, timer or sensor burned out, and the evaporator was again covered with ice, blocking the air supply channels. The faulty element needs to be replaced.
Is it possible to operate the refrigerator if the refrigerator compartment does not work?
For a short time - yes, if you use it as a freezer. However, prolonged operation in this mode (the compressor can work without rest) will lead to overheating and combustion of the compressor motor. It is better to turn off the device before repair.
How much does repair cost if the cold in the main chamber has disappeared?
The cost depends on the reason. Replacing the thermostat or sensor will cost the least. Refilling with freon and finding leaks is in the middle price category. Replacing the compressor is the most expensive option. The technician will tell you the exact amount after diagnostics.
Why does one chamber not work in a refrigerator with one compressor?
Because in such systems the chambers are connected. The cold is produced in one place (the freezer) and distributed. If the connection is broken (no freon, no blowing, no gas flow), the second chamber remains without cooling.
How can you tell that the compressor has burned out and not just run out of freon?
If the compressor turns on, hums for 1-2 minutes and clicks off (the thermal relay is activated) - this is often a sign of electrical problems or jamming. If the buzzing is constant, but the pipes are cold, there is most likely a leak or a blockage. Only measuring the current consumption and pressure will give an accurate answer.