A situation where a refrigerator suddenly stops working can take any home cook or home owner by surprise. Products begin to deteriorate, an unpleasant smell appears, and instead of cold, room temperature reigns on the shelves. Diagnostics of a compressor requires calm and a consistent approach, since the reasons can vary from a simple power outage to a serious breakdown. compressor data-i="48">Before calling a technician or panicking, it is necessary to conduct an initial visual inspection and listen to the operation of the unit. Often, users overlook simple factors, such as a door that is not tightly closed or misconfigured settings. Understanding the operating principles of your model, be it the good old.
Before calling a technician or panicking, it is necessary to conduct an initial visual inspection and listen to the operation of the unit. Users often overlook simple factors, such as a door that isn't closed tightly or settings that have been changed. Electronic control unit. Understanding how your model works, be it the good old Atlant or modern LG No Frost, will help you quickly localize the problem.
In this article we will analyze in detail the main failure scenarios, symptoms, which are worth paying attention to, and action algorithms. You will learn to distinguish a malfunction that you can fix yourself from a situation that requires the intervention of professionals with a vacuum pump and freon.
Primary diagnostics: electricity and settings
The very first thing to do if the refrigerator has stopped freezing is to check the presence of voltage in the network. This seems obvious, but often the problem lies in the power source. Make sure that the socket is working properly, the plug is firmly inserted, and the circuit breaker in the panel has not been knocked out. Sometimes power surges cause the protection to trip.
If everything is fine with the electricity, pay attention to the control panel. In modern models with the system No Frost the temperature settings are often lost. Perhaps one of the household members accidentally activated the “Vacation” or “Super Freeze” mode, or simply changed the degrees. Check to see if the lights are on and if there are any error codes on the display.
⚠️ Attention: If you see an error code on the display (such as F1, E2 or flashing lights), do not ignore it. Write down the combination and check the manufacturer's instructions, as this is a direct signal from the self-diagnosis system about a specific malfunction.
It is also worth checking the tightness of the door. If the sealing rubber is worn out, dirty or deformed, warm air constantly enters the chamber. The compressor can work without interruption, trying to cool the volume, but due to the constant leakage of cold, the temperature does not drop to the required values.
Problems with the compressor: the heart of the refrigerator
Compressor is the main unit that circulates the refrigerant in the system. If it fails, the refrigerator is guaranteed to stop cooling. You can determine a motor malfunction by ear: if the unit is silent or, conversely, hums for a few seconds and clicks, trying to start, but then goes silent again, the problem is most likely in it.
A frequent cause of startup failure is starting relay. This is a small plastic block that is attached to the compressor housing. Over time, the contacts inside the relay oxidize or burn out, and it stops supplying the necessary impulse to start the engine. Replacing the relay is one of the simplest and cheapest repair procedures that you can do yourself.
A more serious situation is a burnt out motor winding or a jammed piston group. In this case, the compressor can become very hot, and the current consumed by it increases sharply. If you smell a burning smell or see that the motor is hot, further attempts to turn on may lead to complete failure of the equipment.
- 🔊 Humming without starting: the compressor tries to turn on, a hum is heard, then a click and silence - a sign of a malfunction of the starting device or jamming.
- 🔇 Complete silence: if the refrigerator is turned on socket, the light inside is on, but the motor is silent - perhaps the compressor itself or the thermostat has burned out.
- 🔥 Overheating: the motor housing is hot to the touch (more than 60-70 degrees) - a signal of an overload or an interturn short circuit.
Freon leakage and clogged capillary tube
If the compressor works continuously, it hums, but there is no cold, and the evaporator (the back wall inside the chamber) remains warm, there is a high probability of refrigerant leakage. Freon is the working fluid of the refrigerator, and without it heat exchange is impossible. Leaks often occur in places where tubes are soldered or due to corrosion of the evaporator, especially if you carelessly damaged the wall with a knife during defrosting.
Another common reason for the lack of cold when the engine is running is clogging of the capillary tube. There is a very narrow section in the freon circulation system where an ice or dirt plug can form. Freon cannot pass further, the pressure in the system drops, and cooling stops. A characteristic sign of a blockage is a hot condenser (grid at the back) only in the upper part or its complete cooling.
To eliminate these faults, special equipment is required: a vacuum pump, a pressure gauge station and scales for refilling. It is impossible and dangerous to “blow out” freon on your own without skills and tools.
| Symptom | Probable cause | Characteristic symptoms |
|---|---|---|
| The compressor works constantly | Leakage freon | The evaporator is warm, the tubes are dry |
| The motor hums and turns off | The system is clogged | Partially hot condenser, gurgling |
| Refrigerator silent | Loss of tightness | Complete lack of pressure in the circuit |
| Weak cooling | Lack of freon | Freezing of only part evaporator |
Is it possible to refuel the refrigerator yourself?
Theoretically it is possible if you have the equipment, but in practice it is difficult. You need to know the type of freon, its quantity, and carefully vacuum the system. An error will lead to breakdown of the compressor.
Malfunctions of the defrost system in No Frost refrigerators
In models with the system No Frost the problem of lack of cold often lies not in cooling, but in improper defrosting of the evaporator. In such units, ice accumulates on a hidden evaporator behind the rear wall. If the defrosting system does not work, the ice completely blocks the air channel, and cold air stops flowing into the chamber.
Three main elements are responsible for the defrosting process: Defrost heating element, thermal sensor (defrost) and timer (or electronic module). If the heating element burns out, the ice does not melt. If the sensor is faulty, it does not give a command to turn on the heater. If the timer fails, the defrost cycle simply does not start.
It is easy to check this hypothesis: if you defrost the refrigerator manually for 12-24 hours (hold doors open), and after turning it on it will begin to freeze normally for a day or two, and then stop again - the problem is guaranteed to be in the defrosting system.
- ❄️ Ice on the back wall: if you remove the plastic panel inside the chamber and see a “coat” of ice there, the fan does not blow air.
- 🌀 Fan noise: blades the fan can touch frozen ice, producing a crackling sound, after which the fan motor burns out.
- 💧 Water under the drawers: melt water from poor-quality defrosting can flow inside the refrigerator or leak out.
⚠️ Attention: Never try to break the ice with a knife or hammer! You can puncture an aluminum evaporator, and then repairs will become economically impractical due to the complexity of soldering and refilling.
Failure of the thermostat or electronic module
In simple refrigerators, thermostatis responsible for turning the compressor on and off. This is a mechanical device with a capillary tube that senses the temperature in the chamber. If the thermostat is stuck in the off position, the compressor will not receive a signal to start and the refrigerator will freeze. You can check it by closing the contacts at the input (for diagnostics), but it is better to replace it with a new one.
In modern models with electronic control, the thermostat function is performed by temperature sensor, which transmits data to control module. If the sensor is lying (shows that it is -5°C in the chamber, although it is +10°C), the module will not turn on the compressor. The control board itself may also fail, ceasing to supply voltage to the start relay or fan.
Electronics diagnostics require a multimeter and knowledge in radio engineering. Often swollen capacitors or traces of burning are visible visually on the board, but only a service center specialist can make an accurate diagnosis.
☑️ Thermostat diagnostics
Environmental influences and improper operation
Sometimes the reason that the refrigerator has stopped cooling lies not in breakdown, and under operating conditions. For example, if the unit is installed close to the wall or in a niche without gaps for ventilation, condenser (black grille at the back) does not have time to release heat. The compressor overheats and goes into protection via a thermal relay.
Installing the refrigerator next to heat sources: radiators, ovens or under direct sunlight also has a negative effect. In the summer, when the kitchen is hot, the load on equipment increases, and old equipment may not be able to cope.
Another factor is the number of products. If you loaded a warm pot of soup or jammed the chamber, disrupting air circulation (especially in No Frost), the temperature may not drop for a long time. The ventilation holes must remain free.
Frequently asked questions (FAQ)
How long does it take the refrigerator to restore temperature after defrosting?
Usually it takes 2 to 4 hours to reach the temperature in an empty chamber. If the chamber is loaded with products, the time can increase to 6-8 hours. In No Frost models, this process occurs faster due to active air circulation.
Why does the refrigerator freeze only in the freezer?
This is a classic sign of a freon leak or a clogged capillary tube. The refrigerant resource is only sufficient for the first cooling circuit (freezer), and the cold no longer reaches the main evaporator. A call to a technician is required.
Is it okay to use a refrigerator if it is humming loudly?
It is not recommended to operate equipment with a strong hum. This may indicate peddling due to lack of freon or a compressor breakdown. Further work will lead to expensive repairs or a complete replacement of the motor.
What to do if the refrigerator smells of gas?
Urgently ventilate the room, do not turn on electrical appliances and call specialists. Although modern refrigerators use safe freons, the smell may indicate a refrigerant leak from the system or, worse, burning wiring or insulation.