The situation when your favorite refrigerator stops working, always takes you by surprise, especially if there are perishable foods inside. Owners of household appliances often panic when they notice that the unit is humming, but does not produce cold, or, conversely, stands in complete silence. It is important to remain calm, since in many cases malfunction you can fix it yourself without calling a technician.
Before disassembling the back wall or looking for service center contacts, it is necessary to carry out a primary diagnosis condition of the electrical appliance. Often the problem lies not in complex internal components, but in a simple lack of power or a tripped protection. Understanding the principle of operation of the compressor and the control system will help you accurately determine the nature of the breakdown.
In this article we will analyze in detail the algorithm of actions that will allow us to identify the cause of equipment failure. We will consider both simple external factors and complex internal breakdowns that require replacement of parts. The correct approach to the problem will save you time and significant financial resources.
⚠️ Attention: Any work on repairing a refrigerator that involves disassembling the electrical part should be carried out only after completely disconnecting the device from the network. Residual voltage in capacitors can be life-threatening.
Primary check of power supply and external factors
The most commonplace, but often ignored reason is the lack of voltage in the outlet. Before sinning with complex electronics, check whether there is light in the room and whether another household appliance operates from the same point. Sometimes the problem lies in oxidized plug contacts or damage power cable.
If the socket is working, pay attention to how the equipment behaves when turned on. The light inside the chamber may be on, but this does not mean there is enough voltage to start the engine. Jumps in the network could trigger the built-in protection, which blocks a restart.
In modern models with electronic control, the reason for the lack of response may be a failure in the control module. Try performing a full reboot cycle: unplug the device for 15–20 minutes, and then turn it on again. This action often clears errors in the memory controller.
Diagnostics of the start relay and compressor
If you hear the refrigerator trying to turn on, a characteristic click is heard, but the motor does not start, the problem most likely lies in the start relay or the compressor itself. Start relay is a small block that provides an impulse to start the engine. Over time, its contacts burn out, and it ceases to perform its function.
To check the relay, it must be removed and shaken. If a ringing sound is heard inside, it means the core is damaged and the part requires replacement. Also visually inspect the contacts for carbon deposits. In some cases, stripping helps, but it is more reliable to install a new element, selecting it according to the marking.
☑️ Checking the start relay
A more serious situation arises if the part itself is faulty compressor. If the motor hums, gets very hot and knocks out the circuit breaker, there may be a turn-to-turn short circuit in the windings. In this case, repairs require specialized equipment for rewinding or completely replacing the unit.
⚠️ Attention: Do not try to repair a sealed compressor yourself without skills in working with freon and vacuum pumps. This requires a license and special tools.
Problems with the thermostat and sensors
In mechanically controlled refrigerators, the thermostat is responsible for turning the motor on and off. If this element fails, the circuit opens and the start command simply does not arrive. You can check it by closing the contacts directly (temporarily), but for accurate diagnostics it is better to use a multimeter.
In models with a system No Frost and electronic control, air sensors perform the thermostat function. Their readings are read by the control module. If the sensor “lies” or shows a break, the refrigerator may not start, considering that the temperature in the chamber has already been reached.
Often, owners accidentally reset the temperature settings, setting the minimum values at which the motor operates non-stop, or, conversely, the maximum values when it rarely turns on. Check the position of the regulator knob or the readings on the display.
How to check the thermostat with a multimeter?
To check, remove the thermostat, immerse its sensitive tube in cold water with ice. Ring the contacts: in the cold the circuit should open (resistance is infinity), and in the heat it should close (resistance is close to zero).
Faults in the control module and wiring
The electronic “brain” of the refrigerator - the control module - can fail due to power surges or moisture. If the tracks on the board are burned out or the capacitors are swollen, the equipment will not receive a signal to start. A visual inspection of the board often helps to identify black spots or burn marks.
It is also worth checking the integrity of the wiring inside the case. Rodents or mechanical damage during transportation could break the wires going to the compressor or fan. Pay special attention to the places where the cables enter the metal walls, where the insulation may be frayed.
In some cases, the problem is solved by resoldering the burnt elements on the board, but more often the entire module needs to be replaced. The cost of such a part can be high, so sometimes it is more advisable to consider purchasing new equipment if the refrigerator is more than 10 years old.
Table of main symptoms and probable causes
Use the following table to quickly navigate the problem. It will help compare the behavior of your unit with the most likely breakdown.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| Silence, light does not light | No power, break cable, faulty socket | Low |
| Buzzing, clicking, does not start | Faulty start relay, jammed compressor | Medium |
| Working 10 seconds and turns off | Compressor protection, interturn short circuit | High |
| Error on display | Sensor faulty, electronics failure | Average |
Specifics of repairing refrigerators of different brands
Different manufacturers use unique engineering solutions, which affects the approach to repair. For example, in refrigerators Indesit i Ariston it is the starting relay that often fails due to its design features. At the same time, equipment LG with linear compressors requires specific diagnostics of the inverter board.
Models Stinol i Biryusa often suffer from freon leakage, which is why the thermal protection relay is triggered and the motor does not starts. Chinese brands may have problems with the quality of soldering contacts on the main control module.
When searching for spare parts, always focus on the exact model of your device. Universal relays are not always suitable, but original parts provide a long service life. Use the markings on the nameplate on the back of the case.
When you need to call a specialist
There are a number of situations when independent repairs are not only useless, but also dangerous. If you suspect a refrigerant (Freon) leak, it requires working with a vacuum pump and charging machine. You can’t just “add” gas—you need to find the leak and fix it.
A technician is also needed if the compressor needs to be replaced. This process includes cutting the tubes, soldering, evacuating the system and charging a strictly defined mass of refrigerant. An error in the amount of gas will lead to a quick breakdown of the new motor.
You should not climb inside the sealed circuits or try to unlock the electronics without a circuit. If, after checking the power supply, relay and thermostat, the cause is not found, professional diagnostics will be the most rational step.
Why does the refrigerator hum, but does not freeze after defrosting?
If you defrosted the refrigerator in less than 8 hours, there could be ice left in the system. It blocks the movement of freon or jams the compressor. Wait another day with the doors open.
Is it possible to turn on the refrigerator if it was standing on its side?
If the refrigerator was transported on its side, oil from the compressor could leak into the cooling circuit. You can turn it on only after standing in a vertical position for at least 12 hours, preferably 24 hours.
What to do if after a power surge the refrigerator stops turning on?
Most likely, the control module or starting relay has burned out. Check the fuse on the board (if accessible). If traces of burning are visually visible, the electronic unit needs to be replaced.
How to understand that the compressor has burned out?
When the windings are shorted, the compressor may hum for several seconds and knock out plugs or simply remain silent. Checking with a multimeter will show the resistance of the windings: if it is zero or infinity, the motor is faulty.