The situation when the refrigerator works, but does not freezeis one of the most common and alarming for owners of household appliances. You hear the usual hum of the motor, the indicators are on, but it’s warm inside the chamber, the food begins to spoil, and the ice in the freezer is melting. This is a clear sign that the cooling cycle is broken, although the compressor continues to function normally. In most cases, the problem lies not in a breakdown of the engine itself, but in related systems or refrigerant leaks.
Ignoring the first symptoms can lead to more serious consequences, including failure of an expensive compressor. It is important to understand that freon circulation is a closed process, and if it stops, then there is an obstacle or a leak. Before calling a technician, it is worth carrying out an initial diagnosis in order to exclude common operating errors or simple malfunctions that can be eliminated on your own in a few minutes.
In this article we will look in detail why The refrigerator does not cool, consider the main components of the unit, such as the thermostat and evaporator, and draw up an action algorithm. You will learn how to distinguish a serious breakdown from a temporary failure, and understand in which cases DIY repairs are possible, and when it is better not to risk it.
Primary diagnostics: household causes and settings
Before looking for hidden technical faults, it is necessary to exclude elementary errors. Often, users accidentally change settings or violate the rules for placing equipment, which leads to a decrease in cooling efficiency. The refrigerator does not freezeif the room temperature is too low or too high, as well as if heat transfer is disrupted.
- ❄️ Check the position of the temperature regulator: it may have been accidentally moved to the "minimum" position or "defrosting".
- 🚪 Make sure that the door closes tightly and the rubber seal is not damaged, allowing warm air to pass through.
- 🌡️ Assess the room temperature: if the room is colder than +10°C or hotter than +32°C, the equipment may not work correctly.
- 🧊 Check that the ventilation holes inside the chamber are not blocked by products or packaging.
Particular attention should be paid quick freezing mode (Super Freeze). If this mode is turned on for a long time, the compressor runs without stopping, which can lead to freezing of the evaporator and subsequent stopping of air circulation. It is also important to check whether the refrigerator is located too close to the wall or heating devices. The gap for ventilation at the back should be at least 5-10 cm.
If after checking the settings the situation has not changed, it is worth conducting a visual inspection of the rear wall of the unit. If you notice swelling or, conversely, dents on the radiator grille, this may indicate mechanical damage to the circuit. In such cases, further operation is dangerous.
Problems with the thermostat and temperature sensors
One of the most common reasons why the refrigerator has stopped freezingis a malfunction of the thermostat. This element is responsible for turning the compressor on and off depending on the temperature inside the chamber. If the thermostat is “stuck” in the “off” position or its contacts have oxidized, the motor may not start, or, conversely, work continuously without achieving the desired cold.
In modern models with a system No Frost and electronic control, air sensors are used instead of a mechanical thermostat (thermistors). Their readings are read by the control module. If the sensor transmits incorrect data (for example, it reports that it is -20°C inside, although it is +10°C there), the compressor simply will not turn on. Diagnosis of such elements requires the use of a multimeter to measure resistance.
⚠️ Attention: If you plan to check the thermostat yourself, be sure to disconnect the refrigerator from the power supply. Mechanical damage to the capillary tube of the thermostat will lead to freon leakage and require expensive repairs.
☑️ Diagnosis of the thermostat
Replacing the thermostat is a procedure accessible to a person with basic skills, if the refrigerator model allows easy access to the unit. However, in systems with electronic control it is better to contact specialists, since reprogramming or precise calibration of a new sensor will be required.
Malfunctions of the compressor and start relay
The compressor is the “heart” of the refrigerator, creating pressure for refrigerant circulation. If the refrigerator does not coolbut the motor hums, tries to start and immediately clicks, the problem may be in the start protection relay. This small element supplies a starting impulse to the motor windings. When it burns out, the compressor cannot reach the required speed.
A more serious situation is an interturn short circuit in the windings of the compressor itself or its mechanical wear. In this case, the motor may work, but not create enough pressure to compress the freon. This can be determined by the characteristic sound: instead of a smooth hum, a metallic clang is heard or the hum becomes quieter than usual. Also, a hot compressor housing in the absence of cold is an alarming signal.
| Symptom | Probable cause | Sound character | Casing temperature |
|---|---|---|---|
| Clicking and silence | Start relay | Single click | Cold |
| Humming, but does not start | Compressor jammed | Strained hum | Gets very hot |
| Works constantly | Freon leak / Thermostat | Even hum | Warm |
| Knock and vibration | Wear of engine parts | Metal knocking | Hot |
If the problem lies in the compressor, independent repair is almost impossible without special equipment for vacuuming and refilling the system. An attempt to replace only a relay on a worn engine can lead to its final combustion.
Is it possible to replace a compressor yourself?
Theoretically, yes, if you have soldering skills and tools. However, this requires nitrogen for purging, a vacuum pump and precise knowledge of the amount and type of freon. An error in dosage will lead to ineffective operation or breakdown of the new compressor in a short time.
Freon leakage and blockage of the capillary system
Refrigerant (freon) is the working fluid that transfers heat from the chamber to the outside. If the refrigerator works, but does not freeze, there is a high probability of leakage. Freon can escape through microcracks in the evaporator, which are formed due to corrosion or mechanical damage (for example, due to careless defrosting with a knife). In a system without freon, the compressor simply circulates air without creating cold.
Another common problem is clogging of the capillary tube. Oil circulates in the system, which over time can thicken or mix with breakdown products, forming a plug. The blockage can also be caused by moisture entering the circuit during poor-quality previous repairs. As a result, freon cannot pass through the narrow section of the tube, and the pressure in the system drops.
Signs of a leak or blockage are often similar:
- 📉 The refrigerator compartment is warm, the freezer is working poorly or not working at all.
- 🔇 The compressor works continuously, without turning off for rest.
- 🔥 The condenser (grid at the back) remains cold or warm only at the beginning/end.
- 💧 No characteristic gurgling or hissing during operation (with a complete leak).
To eliminate these faults, you need to call a technician. The specialist will find the leak using a leak detector, seal it, replace the filter-drier and fill the system with new freon in strict accordance with the rate indicated on the nameplate.
Failures in the defrost system (for No Frost refrigerators)
In units with the system No Frost or Low Frost the serviceability of the defrost system is critical. If the defrost heating element, timer or defrost sensor fails, a coat of ice builds up on the evaporator (which is hidden behind a plastic panel). This ice blocks the vents and prevents cold air from flowing into the chamber. As a result, the refrigerator does not freeze, although the compressor is working properly.
You can diagnose this problem by listening to the operation of the fan. If you can't hear it making noise, it may be jammed with ice. Another sign is the presence of a puddle of water under the refrigerator or inside if the ice began to actively melt when trying to defrost. In some models, an error code appears on the display indicating a malfunction of the defrosting system.
If after complete defrosting (within 24 hours) the refrigerator begins to freeze, but a week later the problem recurs, it means that one of the elements of the defrosting system (heating element, sensor, timer) is faulty and requires replacement. Operation in this mode leads to overload of the compressor.
When you need to call a technician: final recommendations
Refrigerator repair is a process that requires not only theoretical knowledge, but also practical skills, as well as special tools. If you are convinced that the mains voltage is normal, the thermostat is working, and defrosting did not help, most likely the problem lies in the sealed circuit or control electronics.
Independent intervention in the freon circulation system is prohibited by environmental regulations and is technically difficult without equipment. In addition, improper soldering may result in an oil fire or explosion. If you are not confident in your abilities, it is better not to take risks.
⚠️ Attention: Modern refrigerants (R600a isobutane) are explosive. Any work on soldering and replacing circuit components must be carried out in a well-ventilated area in compliance with safety precautions.
A timely call to a specialist will help preserve products and extend the life of the unit. The technician will conduct a full diagnostic, check the pressure in the system, the integrity of the windings and the operation of the electronic boards, and then offer the optimal solution.
Is it worth repairing an old refrigerator?
Repair is advisable if the age of the equipment is less than 10 years, and the cost of spare parts and labor does not exceed 50-60% of the price of a new similar unit. For very old models, it is often more profitable to buy a new one, since the life of the remaining components is also coming to an end.
Why does the refrigerator click but does not turn on?
The click usually makes the start relay try to start the compressor. If this is followed by silence or a humming noise that ends abruptly, the compressor is unable to start. Reasons: the start relay has burned out, the compressor has jammed, or there is a problem with the wiring. Diagnostics with a multimeter is required.
Is it possible to use a refrigerator if it does not freeze?
You cannot use it to store food - they will spoil. However, leaving it turned on in this state for a long time is also dangerous. The compressor runs idle or in overload mode, which can lead to its combustion. It is better to turn off the device before the technician arrives.
How often do you need to defrost a No Frost refrigerator?
The No Frost system does not require manual defrosting to remove ice, as this happens automatically. However, experts recommend that at least once a year (preferably twice) completely turn off the refrigerator, wash it and let it dry. This helps remove odors, check seals and prevent hidden icing of the channels.
What to do if it is warm in the refrigerator and ice in the freezer?
This is a classic sign of problems with air circulation (the channel between the chambers is frozen) or a freon leak. First try complete defrosting for 24 hours. If it doesn’t help, you probably need to replace the defrost heating element or refill with freon.
Does the amount of food affect cooling?
Yes, it does. A refrigerator that is too tightly packed prevents air circulation. Products must not block ventilation openings. In addition, loading warm products causes the compressor to wear out, which can lead to a temporary decrease in cooling efficiency.