The situation when you open the refrigerator door, and it’s warm inside, often becomes an unpleasant surprise. In the best case, the food simply does not freeze; in the worst case, it begins to deteriorate, emitting an unpleasant odor. This is not just a household inconvenience, but a signal that there has been a failure in the system refrigerant circulation or control system.
Before calling a technician or looking for a service center, it is worth conducting an initial diagnosis. Often the reason lies in trivial things: an incorrectly set mode, contamination of the heat exchanger, or even tight adherence of food to the back wall. However, ignoring serious symptoms can lead to failure of an expensive compressor.
In this article we will analyze the main reasons why the equipment has stopped freezing and divide them into those that can be eliminated on your own and those that require the intervention of a professional. Understanding the principles of operation will help you save time and money.
Primary diagnosis: checking simple causes
Panic often occurs ahead of time. If the refrigerator does not freezebut still works properly, you may simply have overloaded the chamber with food or violated the storage rules. Make sure that there are gaps between the products for free air circulation.
Check the temperature conditions. Perhaps one of the household members accidentally touched the regulator, switching it to the minimum cooling or defrosting mode. In modern models with electronic control, a failure could occur due to a power surge.
- ❄️ Check that the ventilation holes inside the cameras are not blocked.
- 🔌 Make sure the power cord is intact and the plug fits snugly in the socket.
- 🌡️ Measure the actual temperature inside the chambers with a thermometer, and do not rely on sensations.
⚠️ Attention: If you notice that the rear grille (condenser) is hot, but the inside is warm, this is a sign that the compressor is working, but the refrigerant is not circulating. This may indicate a blockage or leak.
It is also worth paying attention to sealing rubber bands. If they are dirty or deformed, cold air escapes and the equipment cannot reach the desired temperature. Wipe the seal with a soft cloth and soapy water and check the seal.
Problems with the thermostat and temperature sensors
One of the most common reasons why the refrigerator does not turn on is not cooling is a malfunction 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, the motor simply will not receive a signal to start.
In models with a system No Frost and electronic control, the role of a mechanical thermostat is performed by air sensors (thermistors). They may give incorrect readings if moisture gets on them or an oxidation process occurs on the contacts. In this case, the control module “thinks” that it is already cold in the chamber and does not start the cooling cycle.
To diagnose a mechanical thermostat, you can try to carefully close its contacts (after disconnecting the device from the network!). If the compressor starts working after switching on, the problem has been found. However, with electronic sensors everything is more complicated: here you will need a multimeter to measure the resistance.
How to check a thermostat with a multimeter?
Put the multimeter into dial mode. Remove the thermostat and cool it (for example, by putting it in the freezer for 15 minutes). If the circuit does not open (or does not close, depending on the type) when warmed to room temperature, the part is faulty.
Replacing the thermostat is a do-it-yourself procedure if you have basic tool skills. The main thing is to choose an analogue with identical characteristics, otherwise the operating modes may go wrong.
Faults of the compressor and start relay
The heart of the refrigerator is compressor. If it hums but won't start, or clicks and immediately stops, the problem may be with the start relay or the motor itself. A relay is a small plastic block that fits onto the compressor contacts. It is responsible for supplying the starting pulse.
Often the relay simply burns out or gets stuck. Replacing it is inexpensive and quick. You may hear a characteristic metallic ringing sound if you shake the removed relay - this is a sign that the internal winding or core is destroyed.
| Symptom | Probable cause | Solution |
|---|---|---|
| Buzzes, but does not start | Stuck compressor or relay | Replacing the relay or repairing the motor |
| Clicks and is silent | The starting relay is burned out | Replacing the relay |
| Strong the housing heats up | Overload or wear of the windings | Requires diagnostics by a technician |
| Works continuously without shutting down | Freon leakage or piston wear | Refilling or replacement compressor |
If the problem is in the compressor itself (interturn short circuit, wedge of the piston group), then you cannot cope with this on your own. It will require complex repair using a vacuum pump and special equipment for charging freon.
⚠️ Attempts to open the compressor housing yourself or solder it without skills in welding non-ferrous metals can lead to an explosion or fire. Entrust this work to professionals.
A refrigerant leak and a clogged capillary tube
If the refrigerator is running, the compressor is humming, but there is no cold, and the condenser (grid at the back) remains only partially cold or warm, most likely has occurred freon leak. A refrigerant is a gas that circulates in a closed circuit. If a microcrack has formed in the tubes (often due to corrosion), the gas evaporates and cooling stops.
Another common problem is clogged capillary tube. An ice or oil blockage may have formed in the system, blocking the movement of freon. In this case, the compressor works with overload, trying to push gas, but to no avail.
It is almost impossible to diagnose a leak visually. Craftsmen use leak detectors or paint the system with nitrogen under pressure. You won’t be able to determine the location of the leak without equipment; you can only notice oily spots on the tubes.
☑️ Signs of a freon leak
Repair in this case involves finding a place damage, sealing and recharging the system with refrigerant. This is a labor-intensive process that requires a license and equipment.
Failures in the No Frost system: heating element, timer and defrost sensor
Owners of refrigerators with the system No Frost often face a situation where everything in the freezer is frozen solid, but the main compartment is warm. This is a classic sign of a malfunction of the evaporator defrost system.
A “coat” of ice is growing on the evaporator, which is hidden behind a plastic panel. The fan, which is supposed to drive cold air through the chambers, either stops due to ice, or blows warm air, since the ice blocks heat exchange.
- 🔥 Defrost heating element: A heating element that melts the ice. If it is burned, the ice does not melt.
- ⏱️ Defrost timer: Responsible for switching between the “cooling” and “defrost” modes.
- 🌡️ Defrost sensor: Informs the control module when there is ice melted to turn off the heating element.
To check, you need to defrost the refrigerator (at least 24 hours) and remove the back panel in the freezer. If you find a huge piece of ice under the panel, and after defrosting the equipment works normally, the problem is definitely in the defrost circuit.
When professional repairs are needed: risk assessment
Not all breakdowns should be repaired yourself. If you do not have experience working with electrical circuits and refrigeration equipment, the risk of harming the equipment or yourself is too great. This is especially true for work related to refrigerants and high voltage.
A call to a technician is necessary if:
- 🛠️ Replacement of the compressor or sealing of pipes is required.
- 🔌 There is a suspicion of a malfunction of the electronic control module.
- 💧 A freon leak has occurred (vacuumization and refilling are required).
- 🔥 A burning smell or sparking has appeared.
Professional repair guarantees not only restoration performance, but also operational safety. The technician will be able to accurately diagnose the malfunction using specialized equipment and will provide a guarantee for the work performed.
⚠️ Attention: Repair prices may vary depending on the region, refrigerator model and the cost of spare parts. Always check the total cost of the work before starting repairs.
Frequently asked questions (FAQ)
Why does the refrigerator freeze but does not turn off?
This may indicate a freon leak, compressor wear, or a malfunction of the thermostat. The equipment tries to gain temperature, but due to loss of cold or low power it cannot do this and works non-stop.
Is it possible to operate a refrigerator if it does not freeze?
For a short time - yes, for diagnostics. But long-term operation of a faulty appliance (especially with a faulty thermostat or relay) can lead to overheating and combustion of the compressor, which will make repairs economically unfeasible.
How long does it take to defrost the refrigerator before checking?
For complete defrosting and evaporation of moisture from hard-to-reach places (for example, from under the evaporator in No Frost system) requires a minimum of 24 hours. Insufficient defrosting can lead to false diagnosis.
Why did the refrigerator work after defrosting, but after a week it stopped again?
This is a sure sign of a malfunction of the defrosting system in No Frost models. Ice has again accumulated on the evaporator and is blocking air circulation. It is necessary to check the heating element, timer or defrost sensor.