The situation when you open the refrigerator door and it’s warm inside can unsettle anyone. Products begin to deteriorate, plans collapse, and a panicky desire arises to immediately call a technician or buy a new unit. However the refrigerator does not freeze not always due to a fatal breakdown that requires replacement of the entire device.
Before calling the service center, it is worth carrying out an initial diagnosis. Often the problem lies in trivial things: a loose plug, lost settings, or a capacitor clogged with dust. In this article, we will analyze the main reasons why the equipment stopped cooling, and determine which of them can be eliminated on your own, and where professional intervention will be required.
Understanding the principle of operation will help you save time and money. Inverter compressors even classic models may behave differently in case of failures, but the basic logic of troubleshooting is the same. Let's take a step-by-step look at what needs to be checked first.
Primary diagnostics: electricity and settings
The most commonplace, but often ignored reason is the lack of power supply. If the refrigerator does not turn on, check whether the plug is firmly inserted into the socket. Perhaps there was a power surge and the circuit breaker in the panel tripped or the fuse in the equipment itself blew. Sometimes it is enough to simply reboot the device by unplugging it from the network for 10-15 minutes.
The second important aspect is the operating modes. In modern electronically controlled models, users often accidentally activate the Vacation or Demo mode function. In this case, the light is on, the panel works, but compressor does not start. Also check if the temperature settings are set too high.
⚠️ Attention: If you notice that the power cord is melted or there is a burning smell coming from the outlet, do not under any circumstances try to turn on the device again. This is a direct threat to fire safety.
The third point of check is the tightness of the door. If the seal (elastic band) is worn out, dirty, or the door is warped, warm air constantly flows inside. The unit is working hard, trying to compensate for heat loss, but cannot reach the desired temperature. Check the gap around the entire perimeter by applying a sheet of paper: it should be pulled out with force.
Malfunctions of the thermostat and sensors
If everything is in order with the electricity and doors, but the refrigerator does not freezethe problem may be in the “brains” of the system - the thermostat or sensors. In older mechanically controlled models, the thermostat controls the temperature. This device measures the temperature in the chamber and gives the command to the compressor to turn on or off.
If the thermostat breaks down, the compressor either does not start at all or works without stopping, causing severe freezing of the back wall or, conversely, complete defrosting of the food. You can determine the malfunction by closing the contacts of the thermostat (for experienced users) or replacing it with a known good one.
In units with a system No Frost and electronic control, the thermostat function is performed by air sensors. Their failure leads to incorrect temperature readings. The system “thinks” that there is already cold and does not turn on the engine. Replacing the sensor is a simple procedure, but requires disassembling the internal panel.
Symptoms of sensor malfunction are often accompanied by errors on the display. Modern models LG, Samsung, Bosch can self-diagnose and display error codes. Deciphering the code will help you determine exactly which element has failed.
Problems with the start relay and compressor
The heart of the refrigerator is compressor. If it hums but won't start, or makes a clicking noise and stops, the problem is most likely in the start relay or the motor itself. A relay is a small plastic block that fits onto the contact group of the compressor. Over time, its contacts burn out, or the bimetallic plate loses its properties.
Replacing the start relay is one of the simplest and cheapest repair procedures. You can purchase a similar relay at a parts store and install it yourself by simply removing the old unit and putting on a new one. However, if after replacing the relay the situation has not changed, and the compressor hums for 5-10 seconds, and then clicks and turns off, the problem may be in the motor wedge or inter-turn short circuit of the windings.
| Symptom | Probable cause | Complexity repair |
|---|---|---|
| Silence, no hum | Malfunction of thermostat, relay or wiring | Low |
| Humming 5-10 sec, clicking, silence | Fault starting relay or compressor wedge | Medium/High |
| Continuous operation without shutdown | Freon leak, compressor wear, capillary clogged | High |
| Strong knocking when starting | Broken compressor valves | High (replacement) |
If a failure of the compressor itself is diagnosed, repairs become economically feasible only if the equipment is under warranty or you are ready to buy a new powerful unit. In other cases, replacing a compressor is often comparable in price to buying a new refrigerator.
☑️ Compressor diagnostics
Refrigerant leak and system blockage
One of the most insidious reasons why the refrigerator has stopped freezing is a freon leak. The refrigerant circulates in a closed circuit, and if a microcrack forms in the evaporator tubes or condenser, the gas escapes. Without freon, heat is not removed from the chambers.
Signs of a leak:
- 🧊 The compressor works constantly without turning off.
- 🔥 The condenser (grid at the back) remains cold or warm only partially.
- 📉 The temperature in the chambers gradually rises to room temperature.
- 💧 Lack of characteristic gurgling or hissing during operation (in some models).
The second problem of the hydraulic part is clogged capillary tube. Oil circulates in the system, which over time can thicken or mix with wear debris, forming a plug. Freon cannot pass through the narrow section, circulation stops. In this case, the compressor will also work continuously, trying to push through the system, and the freezer may become covered with frost only at the entrance of the tube.
⚠️ Attention: Eliminating freon leaks and cleaning the capillary requires special equipment (vacuum pump, pressure gauge station) and skills rations. It is impossible to carry out this repair on your own without tools.
In this case, the technician finds the leak (often a foamed circuit or solder joints), seals it, evacuates the system and fills in a new volume of refrigerant. This is a complex technical process that requires precision.
Why can’t you just add freon?
Adding refrigerant without finding and fixing the leak is a temporary measure. After a week or a month, the gas will come out again, and the compressor, operating on non-condensable gases (air), may burn out. In addition, it is not known exactly how much freon needs to be added, since part of the system is empty.
Faults in the defrosting system (No Frost)
In refrigerators with the system No Frost ice does not form due to the constant circulation of cold air and periodic automatic defrosting of the evaporator. If this system fails, the evaporator becomes overgrown with a “fur coat” that blocks the air channels. As a result: it is cold in the freezer, and warm in the refrigerator compartment.
The main elements of the system that can fail:
- ❄️ Defrost heating element —a heating element that melts the ice. If it burns out, the ice does not melt.
- 🌡️ Defrost sensor (defrost timer) - gives a command to turn on the heating. If it “lies”, heating will not start on time.
- 🚰 Drain hole - if it is clogged with dirt or ice, melt water does not leave, freezes below and blocks the operation of the fan.
- 🌀 Fan - if it stops due to ice or breakdown, cold air does not enter the chamber.
You can diagnose the problem by completely defrosting the refrigerator (turn it off for 24 hours with the doors open). If, after complete defrosting, the unit began to freeze like new, but after 1-2 weeks the problem returned, the problem is definitely in the defrosting system.
What to do ABSOLUTELY DON'T
When trying to revive equipment, users often make mistakes that turn a simple repair into an expensive replacement of components. If the refrigerator does not freeze, avoid the following actions:
First, do not pick at the ice on the back wall or evaporator with a knife or sharp objects. In modern models, freon channels are mounted directly into the housing wall or are located very close to the surface. One careless blow will pierce the tube, freon will come out, and repairs will become extremely difficult and expensive.
Secondly, do not try to start the compressor bypassing the protective systems (thermal relay, starting). This can lead to a fire in the wiring or permanent failure of the motor. Electricity and refrigerant do not tolerate amateurish intervention.
⚠️ Attention: Manufacturers are constantly changing the designs and refrigerants used (R600a, R134a). Parts from older models may not fit new ones. Always check the labeling of spare parts with the documentation of your specific model before purchasing.
Thirdly, do not ignore the first signs: the appearance of puddles under the refrigerator, unusual noise, long operating time. A timely contact with a technician often allows you to get away with cleaning or replacing a small part before the compressor fails.
Frequently asked questions (FAQ)
Why does the refrigerator work, but does not freeze after defrosting?
Most likely, the problem is in the defrosting system (the heating element is burnt out or sensor) or the capillary tube is clogged. The ice has melted, the water has left, but the cold or refrigerant circulation mechanism is disrupted. Diagnostics by a specialist is required.
Is it possible to use a refrigerator if it does not freeze well?
For a short time - yes, but the food may spoil. Long-term operation in this mode is harmful to the compressor, which wears out without shutting down. It is better to eliminate the cause or at least defrost the unit.
How much does it cost to repair if the freon is gone?
The cost consists of finding the leak, soldering, vacuuming and refilling. This is one of the most expensive types of repairs. In old refrigerators, it is sometimes cheaper to buy a new one than to restore the tightness of the foamed circuit.
How to understand that the compressor has burned out?
If you hear a click when you turn it on, the buzzing lasts a couple of seconds and then click again (the thermal relay turns off the motor), and the starting relay is working properly - there is a high probability of an interturn short circuit or compressor wedge.