The situation when it is warm in the refrigerator compartment, food begins to deteriorate, and the freezer compartment continues to operate as normal, is one of the most common complaints of household appliance owners technology. This behavior of the unit can be confusing: the compressor seems to be humming, the light inside is on, but there is no required cold. This is not just a temporary failure, but a signal that a specific failure has occurred in the complex refrigerant circulation or temperature control system.
Understanding why The refrigerator does not hold the temperature in the main compartment requires knowledge of the basic principles of operation of the device. In modern models, especially with the No Frost system, cold is generated in the freezer and then distributed to the rest of the chambers using fans. If this mechanism is disrupted, we get a temperature imbalance. Ignoring the problem can lead to a complete stop of the compressor or damage to expensive products.
In this article we will analyze in detail the mechanical and electrical causes of the malfunction, explain how to carry out the initial diagnosis yourself and when it is necessary to call a technician. It is important not to panic, but to consistently eliminate simple factors, such as incorrect loading or broken settings, before proceeding with complex repairs.
Violation of operating rules and simple causes
Before looking for a breakdown in the bowels of the unit, it is worth eliminating trivial user errors. Often refrigerator malfunction it turns out to be a consequence of improper operation, and not a technical breakdown. Check if the air flow inside the chambers is blocked. If you press the shelves tightly against the back wall, cold air simply cannot circulate.
Particular attention should be paid to the tightness of the door. If the sealing rubber is worn out, dirty or deformed, warm air constantly enters the chamber. The compressor tries to compensate for the heat, working hard, but cannot cope with the volume, especially in the hot season. As a result, the ice still remains in the freezer, and the temperature in the refrigerator compartment is already above zero.
⚠️ Attention: If you notice that the rubber seal has become hard or cracked, do not try to soften it with boiling water. This will only accelerate the destruction of the material. Use special rubber care products or replace the element.
It is also worth checking the thermostat settings. Perhaps one of the household members accidentally reduced the operating mode to minimum. In models with electronic control, a power surge may have occurred, which reset the settings to factory settings or, conversely, set incorrect parameters.
Problems with defrosting the evaporator in the No Frost system
In refrigerators with the system No Frost the most common reason for the disappearance of cold in the main chamber when the freezer is running is the freezing of the evaporator. The system is designed so that the fan drives cold air from the freezer into the refrigerator compartment through special channels. If these channels become clogged with ice, air stops circulating.
An ice plug is formed due to a malfunction of the defrost system. In normal mode, the heating element (Defrosting heating element) periodically turns on and melts the frost on the evaporator. If the heating element burns out, or the defrost timer fails, or the defrost sensor transmits incorrect signals, ice grows uncontrollably.
- 🧊 Ice blocks the air dampers, blocking the access of cold.
- 🌀 The fan continues to work, but it drives the air inside the freezer, not letting it in further.
- 🌡️ Temperature sensors in the refrigerator compartment record heat and command the compressor to work continuously.
You can diagnose this problem by listening to the operation of the device. If you hear the hum of the compressor, but do not hear the characteristic sound of the fan operating, or, conversely, the fan makes an unusual noise, as if it is working in emptiness, this is a sign of icing. Also, a “fur coat” or ice may appear on the back wall of the freezer, which should not be there.
To temporarily solve the problem, you can completely defrost the refrigerator. It is necessary to turn off the device from the network and leave the doors open for at least 24 hours (preferably two days). This will allow the ice in the hidden channels to completely melt. If, after switching on, cold appears and lasts for several days, and then disappears again, the problem is guaranteed to be in the defrost system components.
Compressor malfunctions and loss of performance
The compressor is the “heart” of the refrigerator, and its incorrect operation often leads to the problem described. However, we are not talking about stopping the engine completely, but about reducing its performance. When the compressor is worn out or has mechanical defects, it can create insufficient pressure to pump freon throughout the entire circuit.
In such cases, the refrigerant manages to cool the first section of the circuit (usually the freezer), but reaches the main compartment already warm or in insufficient volume. This is typical for older models or units that were overloaded. Also, the problem may lie in the start-protection relay, which does not allow the motor to reach full power.
| Symptom | Possible cause | The nature of the compressor operation |
|---|---|---|
| The freezer freezes poorly, the refrigerator does not work | Low compression | Works continuously, gets very hot |
| The cold disappears periodically | Sticking valves | Works intermittently, clicking |
| Lack of cold everywhere | Complete motor failure | Does not turn on or hums and turns off |
If the compressor runs continuously without turning off for days, and the temperature in the chambers does not drop to the required values, this is a sure sign of a loss of its performance or a refrigerant leak. In this state, the engine will quickly burn out, so operation of the device must be stopped.
Why can a compressor lose power?
There are valves inside the compressor that wear out over time or become coked by oil breakdown products. This leads to the fact that the piston does not create the required vacuum, and freon circulates too slowly for effective cooling of a large volume.
Clogged capillary tube and leakage of freon
One of the most insidious problems is partial clogged capillary tube. There is a very thin section in the refrigerant circulation system where liquid freon turns into gas, causing cooling. If moisture or oxidation products enter the system, an ice or dirt plug forms in this narrow place.
When clogged, freon cannot circulate freely throughout the entire circuit. It accumulates at the beginning of the cycle, intensively cooling the freezer, but does not reach the evaporator of the refrigerator compartment. A telltale sign is that the condenser grille (at the back or sides) may only be partially hot or remain cold.
A refrigerant leak has similar symptoms. If a microcrack has formed in the circuit, the amount of freon is gradually reduced. It is no longer enough for a full cooling cycle. First, the upper chamber stops freezing, then the temperature in the freezer begins to rise. It is almost impossible to visually detect the location of the leak without special equipment.
⚠️ Attention: Attempts to pierce the tubes yourself or “add freon” without eliminating the cause of the leak and vacuuming the system will lead to final breakdown of the compressor. Repair requires a license and special tools.
To diagnose blockages, technicians often use the method of alternately cutting off circuits or measuring the pressure in the system. If, after defrosting (removing the ice plug of moisture), the refrigerator begins to work normally for a short time, and then stops freezing again, this is a “floating” blockage that requires professional cleaning or replacement of the filter drier.
Failures in the operation of electronic modules and sensors
Modern refrigerators are controlled by complex electronics. If you have an electronically controlled model, the problem may lie in control module or sensors. The temperature sensor in the refrigerator compartment could fail and transmit a false signal to the board that there is cold there. Having received this signal, the “brain” of the refrigerator simply does not turn on the cooling.
Air dampers (dampers) also often fail. These are motorized mechanical valves that open and close to control the flow of cold air from the freezer. If the damper is stuck in the closed position, the cold physically cannot enter the main compartment, even if the freezer is -20°C.
- ❄️ The temperature sensor shows incorrect values due to oxidation of the contacts.
- 🔌 The air damper motor has burned out.
- 📟 Main controller firmware failure after a power surge.
Electronics diagnostics require a multimeter. It is necessary to “ring” the sensors for resistance and compare the readings with the reference ones for a given temperature. A faulty sensor usually indicates either an open circuit, a short circuit, or a resistance that does not correspond to the temperature.
Specifics of operation of dual-circuit systems
In expensive models, two independent cooling circuits or one circuit with two capillary tubes and a solenoid valve can be used. In such systems, a malfunction of the switching valve leads to the fact that freon circulates only through the freezer circuit.
The solenoid valve is a device that, based on a signal from the control board, directs the refrigerant flow to the desired evaporator. If the valve is “stuck” in one position or its coil is burned out, the second circuit remains without cooling. This is a technically complex malfunction that requires replacing the valve and recharging the system.
You can distinguish such a breakdown from others by the characteristic absence of valve clicks when switching modes (if you can hear them) and by the fact that the freezer works perfectly, and the refrigerator is constantly warm, without defrosting cycles.
☑️ Do-it-yourself primary diagnostics
When you need to call a technician
Independent repair is possible only in case of simple malfunctions: replacing the seal, defrosting, replacing a light bulb or sensor (if you have the skills). However, there are situations when the intervention of a professional is strictly necessary.
If after a complete 24-hour defrosting the problem returns after a few days, it means that one of the defrost system components (heating element, timer, sensor) is faulty. If you hear gurgling, hissing, or see that the condenser is not heating up at all, these are signs of a leak or blockage. A master is also needed if the compressor operates continuously without turning off.
⚠️ Attention: Opening the sealed refrigerator circuit at home without a vacuum pump and scales for freon is unacceptable. Moisture or air remaining in the system will lead to rapid failure of the compressor.
Contacting a specialist is also necessary if you are not confident in your abilities when working with electrical circuits. Incorrect connection of a new sensor or heating element can lead to a short circuit and a fire hazard.
Prevention and extension of service life
To avoid situations where the refrigerator stops freezing, it is important to follow the operating rules. Regularly, at least once a year, carry out a complete defrost, even if you have a No Frost system. This will help remove excess moisture from hard-to-reach places and reduce the load on the defrosting system.
Keep the condenser grill at the back of the refrigerator clean. Dust and pet hair act as a heat insulator, preventing heat transfer. The compressor is forced to work longer and harder, which reduces its service life. Cleaning with a vacuum cleaner every six months will significantly extend the life of the unit.
Do not overload the refrigerator compartment with food. An air stream should circulate between objects. If the shelves are filled to capacity, the cold will not be distributed evenly, and the sensors will not work correctly, causing failures in the control algorithms.
The myth of a full load
There is an opinion that an empty refrigerator works worse, and a full one works better. This is only partly true. A full refrigerator does keep the cold longer during a power outage, but to initially cool a large volume of warm food, the system needs to work at its maximum capacity, which is harmful for the compressor.
Why did the refrigerator start working after defrosting, but a week later it stopped again?
This is a classic sign of a faulty defrost system. During defrosting, you manually removed the ice plug and the air began to flow again. But since the heating element, timer or defrost sensor did not work, ice accumulated again within a week and blocked the channels again. The faulty part needs to be replaced.
Is it possible to operate the refrigerator if the main chamber does not work?
Technically, the compressor will work, but this should not be done. It will work non-stop trying to reach temperature, which will cause it to overheat and burn out after a short time. In addition, the food in the main chamber will spoil.
How much does repair cost if the compressor burns out?
Replacing a compressor is the most expensive type of repair, often amounting to up to 70% of the cost of a new refrigerator. Includes the cost of a new motor, soldering, vacuuming and refilling with freon. It is often more advisable to buy new equipment.
How to understand that the freon leak is in the foamed part?
If the leak occurs in a pipeline that is foamed in the housing (often in the partition between the chambers), it is not visible from the outside. An indirect sign is swelling of the wall of the refrigerator body or the appearance of rust in a certain place. An accurate diagnosis is made by a technician with a leak detector.
Does the installation level of the refrigerator affect cooling?
Yes, it does. If the refrigerator is tilted backwards, the door may not fit tightly on its own, breaking the seal. In addition, in some models, the oil in the compressor can flow into the circuit if there is a strong distortion, causing water hammer or blockage.