The situation when the refrigerator compartment becomes noticeably warmer, and food begins to spoil faster than usual, always takes you by surprise. This is not just a household discomfort, but also a direct threat to the safety of your family’s food supplies. Often, equipment owners notice the problem too late, when ice has already appeared on the walls, and begin to work almost without interruption, trying to compensate for the lack of cold.
There can be many reasons why the refrigerator has stopped freezing normally: from banal condenser contamination to a serious refrigerant leak. It is important not to panic, but to consistently analyze the symptoms. Modern two-chamber models old single-chamber “boxes” may behave differently, but the basic principles of thermodynamics remain the same for all devices.
In this article We will analyze in detail the main breakdown scenarios, explain how to carry out initial diagnostics without calling a technician, and determine in which cases repairs are possible on our own, and when it is better to immediately contact the service center. Understanding the structure of your unit will help save time and money.
Primary diagnostics: external factors and settings
Before suspecting a serious breakdown compressor or a freon leak, it is necessary to eliminate basic operating errors. Very often the reason lies in the incorrect location of the equipment or incorrect settings. Make sure the unit is level and the doors fit snugly against the frame. If the rubber seal is worn out or dirty, cold air will freely evaporate out, causing the motor to wear out.
Pay attention to the temperature regime. Perhaps one of the household members accidentally turned the regulator to the “minimum” position or activated the “vacation” mode. It is also critical to check the ventilation. The rear wall of the device must be at least 5-7 cm from the wall in order for heat exchange heat transfer to occur effectively.
⚠️ Attention: If you have recently moved the refrigerator, washed it or defrosted it, make sure that enough time has passed (at least 2-4 hours) before turning on. Starting the compressor immediately after transportation in a horizontal position can lead to water hammer and failure of the unit.
Check the loading of the chambers. If you have just placed a large amount of warm food in the refrigerator or have tightly packed shelves, air circulation may have been compromised. In systems No Frost this is especially critical, since the dampers can be blocked by bags.
Problems with the defrosting system and ice
One of the most common reasons why the refrigerator does not freeze wellis the formation of excessive ice on the evaporator. In devices with manual defrosting, a layer of ice more than 5 mm thick begins to act as a heat insulator, preventing cooling of the internal volume. The compressor hums, trying to reach the set temperature, but the efficiency of the process drops to zero.
In systems No Frost automation is responsible for removing moisture. If the defrost heating element, timer or defrost sensor fails, the evaporator becomes overgrown with a “fur coat” that blocks the cold air supply channels. As a result, the refrigerator compartment is warm, and the freezer may have a normal temperature, but only until the fan is completely blocked by ice.
- 🧊 Symptoms: a thick layer of ice or snow is visible on the back wall, the fan makes extraneous sounds or is silent.
- 🔌 Actions: it is necessary to completely defrost unit (at least 24 hours with open doors).
- 🔍 Check: after defrosting, check the integrity of the heating element and sensors with a multimeter.
If after complete defrosting the refrigerator works like new, but after 1-2 weeks there is a problem returned, which means one of the elements of the defrost system is faulty. Ignoring this signal will result in the compressor working continuously and burning out.
☑️ Defrost system diagnostics
Malfunctions of the thermostat and sensors
The thermostat (thermostat) is the “brain” that commands the compressor to turn on or off. If this element fails, the refrigerator may either not turn on at all, or work non-stop, not achieving the desired performance. Older models use mechanical thermostats with a bellows tube, while new ones use electronic sensors (thermistors).
When a mechanical regulator breaks down, a situation is often observed when the chamber does not cool completely, but the compressor does not start again. Or vice versa - the unit freezes to a “glacier” state without turning off. Electronic sensors are more accurate, but are sensitive to voltage surges. Their resistance changes depending on the temperature, and any deviation from the norm is recorded by the control board as an error.
To diagnose a mechanical thermostat, you can temporarily close its contacts. If after this procedure the compressor starts working, then the regulator requires replacement. However, with electronics, everything is more complicated: here you will need diagnosis of error codeswhich are displayed on the display or indicated by blinking lights.
⚠️ Attention: When replacing the thermostat, it is important to correctly install and secure the sensitive tube (capillary) on the evaporator. Poor contact of the tube with the surface will lead to incorrect temperature readings and cyclic malfunctions.
Refrigerant leakage and problems with the compressor
The most unpleasant and expensive problem is a freon leak or failure of the motor-compressor. The refrigerant circulates in a closed circuit, and if a microcrack forms in the tube (often due to corrosion), the gas gradually evaporates. As a result, the pressure in the system becomes insufficient for effective heat exchange.
The compressor is the heart of the refrigerator. If it hums, clicks, but does not start, or starts for a couple of seconds and stalls (the thermal relay is triggered), this is a sign of mechanical jamming or electrical breakdown of the windings. Also, the cause may be a faulty start relay.
| Symptom | Possible cause | Nature of motor operation |
|---|---|---|
| The refrigerator does not freeze, the motor is silent | Open circuit, compressor or relay burned out | No sound or single click |
| It freezes weakly, the motor runs constantly | Freon leak, capillary clogged | Works non-stop, hot |
| It freezes only near the evaporator | Lack of refrigerant | Works in enhanced mode |
| A gurgling sound is heard | Freon leakage or oil getting into the circuit | Cyclic operation |
If you notice that the condenser grille at the back of the refrigerator is cold (or warm only at the very beginning), and the motor is hot and runs without interruption, there is a 90% probability that it happened refrigerant leak. It is impossible to eliminate such a malfunction on your own: the system must be evacuated, soldered, and refilled with new gas.
Is it possible to refill the refrigerator yourself?
Refilling the refrigerator yourself is strictly not recommended without special equipment. To do this, you need a vacuum pump, a pressure gauge station and precise knowledge of the type and weight of the refrigerant. Unprofessional refilling will lead to rapid failure of the compressor or explosion of the system.
Clogged capillary tube
Another technical reason why the refrigerator does not cool wellis clogged capillary tube. This is a thin copper pipeline where the refrigerant is throttled. During operation, microscopic oxide particles, paraffin or ice plugs may form in the system (if there is moisture in the system).
If clogged, the circulation of freon is disrupted. The pressure at the inlet to the compressor drops, and it begins to work with overload. A characteristic sign is that the condenser (grid at the back) heats up unevenly: only the first section is hot, and the rest remains cold. There may also be swelling of the walls of the refrigerator in the area of foaming.
Removing the blockage requires purging the system with nitrogen under high pressure and replacing the filter-drier. This is a complex procedure that requires the qualifications of a master. Attempts to “break through” the blockage on your own often lead to rupture of the tubes and complete loss of refrigerant.
Influence of the environment and seasonality
Do not forget that the efficiency of the refrigerator directly depends on the room temperature. Most models are designed to operate in a climate class from +16°C to +32°C (or +43°C). If you install the unit in an unheated country house in winter or in a kitchen, where in summer the temperature rises above +35°C, performance it will drop sharply.
When the ambient temperature is too low, the oil in the compressor thickens, which makes it difficult to start and lubricate the components. If it is too high, the refrigerator simply does not have time to release heat, and the operating time of the motor increases, but the temperature inside the chambers does not drop to normal.
In addition, the location next to heat sources (batteries, ovens, direct sunlight) creates a load on the system. In such conditions, even a working device will work to the limit.
⚠️ Attention: Operating the refrigerator at temperatures below +10°C can lead to freezing of water in the drainage system and failure of the thermostat, since it will no longer receive a signal about the increase in temperature in the chamber.
Frequently asked questions (FAQ)
Why does the refrigerator freeze but does not turn off?
This may indicate a freon leak, a clogged system, or a malfunction of the thermostat. The unit tries to reach the set temperature, but due to loss of cold or circulation problems, this fails. Pressure diagnostics and checking the electrical circuit are required.
Can a refrigerator freeze poorly due to overload with food?
Yes, if food blocks the ventilation holes (especially in No Frost systems), cold air does not circulate. Also, warm foods delivered in large quantities at once can temporarily upset the temperature balance.
What to do if, after defrosting, the refrigerator still does not cool?
If defrosting within 24 hours did not help, the problem is of a technical nature. Most likely, one of the components has failed: the compressor, thermostat, start relay, or a refrigerant leak has occurred. You need to call a technician.
Why is it warm in the refrigerator compartment, but normal in the freezer?
In two-chamber models, this often indicates a malfunction of the fan (in No Frost), which does not drive air from the freezer to the upper chamber, or problems with the damper. Freezing of the air supply channel is also possible.