A situation when a refrigerator suddenly stops working can take any family by surprise, because the safety of food and comfort depend on the serviceability of this unit in the kitchen. Self-repair seems like a scary prospect for those who have never held a multimeter or a screwdriver in their hands, but in many cases the problem lies in small things that do not require calling a technician. Fault diagnosis is the first and most important stage, which allows you to save a significant amount of money and time waiting for service.
Before you start disassembling the case, you need to clearly understand what kind of problem you are facing: the device does not turn on, does not freeze enough, works without stopping, or makes strange sounds. In most cases, about 70% of breakdowns, such as thermostat malfunction or the starting relay, can be repaired independently with a minimum set of tools. It is only important to follow the safety precautions and the sequence of actions described in this manual.
Primary diagnostics and checking the power supply
The most commonplace, but often ignored reason for the lack of cold is problems with the power supply. If the refrigerator Indesit or LG is silent and the light inside does not light up, do not rush to blame the compressor. First of all, check whether the plug is firmly inserted into the socket, and whether the socket itself is working by connecting another device to it, for example, a hair dryer or a phone charger.
If everything is in order with the socket, inspect the power cord for visible damage, kinks or traces of melting. Electrical circuit must be intact, since even a microscopic break inside the insulation can interrupt contact. In some models with electronic control, the cause of the failure may be a power surge in the network, which knocked out a fuse or disrupted the controller settings.
Try to perform a full reboot cycle: disconnect the unit from the network for 10-15 minutes, and then turn it on again. This action often helps to reset errors in the electronic control module, if any.
- ⚡ Check the voltage in the network using a multimeter - it should be between 220-230 Volts.
- 🔌 Inspect the plug and socket for blackening, sparking or a burning smell.
- 🔦 Make sure that the power indicator on the front panel or inside the camera is on.
⚠️ Attention: If you find that the insulation of a cord or socket has melted, under no circumstances reconnect the device to the network until replacing the damaged element, this may lead to a fire.
Analysis of the operation of the compressor and starter relay
The compressor is the heart of the refrigerator, and the circulation of the refrigerant depends on its operation. If you hear the device humming, but no cold is generated, or a click is heard and there is silence, the problem most likely lies in starting relay or the motor itself. The relay is responsible for starting the engine, and if its contacts are burnt or the mechanism is jammed, the compressor will not be able to start.
To check the relay, you need to disconnect the refrigerator from the network, remove the back panel and carefully remove the box attached to the side of the compressor. Shake the relay: if a rattling sound is heard inside, it means that the internal part has broken and requires replacement. This is a consumable item that is inexpensive and can be easily changed even by a beginner.
If the relay is working properly, but the compressor still does not start or is overheating, the piston group may have jammed or the winding has broken. In the case of the winding, independent repair is practically impossible and requires rewinding or replacing the unit. Thermal protection relay can also turn off the motor if it operates in extreme conditions.
How to check the compressor windings?
To check the windings use the multimeter in resistance measurement mode. The normal resistance of the working winding is usually 10-30 Ohms, the starting winding is 20-40 Ohms. If the device shows infinity (open circuit) or zero (short circuit), the compressor is faulty.
- 🔨 Gently tap the relay body with a hammer (sometimes this helps to unblock a stuck mechanism).
- 🌡️ Touch the compressor body: if it is red hot or smoking, immediately turn off the device.
- 🔧 Check the integrity of the contacts on the terminals of the starting device.
Checking and replacing the thermostat (thermostat)
The thermostat is a sensor that tells the compressor when to turn on and when to stop. If the refrigerator works without interruption and freezes food, or, conversely, does not turn on at all, retaining heat, the culprit is often precisely thermostat. In modern models Samsung or Bosch its role can be played by an electronic sensor, but the diagnostic principle is similar.
To check a mechanical thermostat, it must be removed from the chamber (usually it is located under the plastic temperature control knob) and the contacts are closed with wires. If the compressor starts when the contacts are closed, it means that the sensor itself is faulty and requires replacement. This is one of the simplest operations within the framework of the topic “how to repair a refrigerator with your own hands.”
When installing a new element, it is important to correctly adjust the calibration screw, if any, so that the refrigerator reaches the operating mode in the allotted time. A poor-quality or incorrectly installed thermostat will lead to increased energy consumption and wear on the compressor.
| Symptom | Probable cause | Action |
|---|---|---|
| The refrigerator does not turn on | Open circuit thermostat | Close contacts to check |
| Works without stopping | Contacts sticking or freon leakage | Check contacts and pressure |
| Frequent on/off | Incorrect sensor calibration | Adjust or replace the thermostat |
| Ice on the back wall | Temperature setting too low | Adjust the regulator knob |
⚠️ Attention: When replacing a thermostat, make sure that the capillary tube of the new sensor is the same length as the old one, otherwise the temperature readings will be incorrect.
Diagnostics of the defrosting system and evaporator
In refrigerators with the system No Frost a frequent problem is the failure of the defrost system. If you see that the evaporator is covered with a thick layer of ice (“coat”), and the fan does not spin or hums, touching the ice, then the defrosting cycle is broken. The main elements of this system: defrost heating element, defrost sensor and timer (or electronic module).
For diagnostics, you need to get to the evaporator by removing the back panel in the freezer. Test the heating element with a multimeter: if the resistance is infinitely high, the heating element is burnt out and requires replacement. The defrost sensor is checked in the same way - it must open the circuit at a certain temperature.
If the heating element and sensor are working, but defrosting does not occur, the problem may be in the timer or control board. In some cases, manual defrosting during the day helps, but if the problem repeats after 1-2 weeks, replacement of defective parts is inevitable. Water drainage system It must also be clean, otherwise melt water will flow onto the floor.
☑️ System check No Frost
Elimination of extraneous noise and vibration
A loud hum, knocking or rattling is not only annoying, but can also signal serious mechanical problems. If the refrigerator is not level, vibration from the compressor is transmitted to the cabinet and floor, creating a lot of noise. Adjustment support legs often solves the problem in a couple of minutes.
If the noise comes from inside and is similar to a grinding or metallic clang, the motor mount may be loose or the shock absorbers may be damaged. In rare cases, the source of sound becomes a fan in the system No Frost, on which ice may have stuck or a foreign object may have fallen. It is also worth checking to see if the condenser pipes or other housing elements are touching during vibration.
A sharp whistling sound may indicate a refrigerant leak through a microcrack, although more often it is simply the sound of gas passing through a capillary tube, which is normal. However, if the sound has changed dramatically, you should listen to the behavior of the unit.
- 🔊 Check whether bottles or cans are too close to each other on the shelves.
- 📏 Make sure that there is a gap of at least 5-7 cm between the back wall of the refrigerator and the kitchen wall.
- 🔩 Tighten the compressor mounting screws if they are loose due to vibration.
⚠️ Attention: If you hear gurgling or hissing immediately after the compressor is turned off, this is normal, this is how the refrigerant in the system is flowing. You only need to sound the alarm if there is a constant hissing sound from the operating unit.
Repairing the seal and problems with the door
A tight fit of the door is the key to efficient operation of the refrigerator. If sealing rubber it is torn, stiff or simply dirty, warm air enters the chamber, causing the compressor to work for wear. It is easy to check the tightness of the fit using a sheet of paper: clamp it with the door around the perimeter; if the sheet is pulled out too easily, the seal is broken.
You can often restore the properties of rubber by simply washing it with warm water and soap or treating it with silicone grease. If the rubber is deformed, you can try to straighten it with a hair dryer (heating and stretching), but this is a temporary measure. In case of visible breaks or loss of elasticity, a complete replacement of the seal is required, which is selected according to the model of the refrigerator.
Also check the door hinges: if they are loose, the door warps and does not fit tightly even with a new seal. The hinges are adjusted by tightening the corresponding bolts.
When you need to call a professional technician
Despite the desire to save money, there are situations when independent repairs are dangerous or technically impossible without specialized equipment. If you find that you have logged out of the system refrigerant (freon), no folk methods will help here. Refilling requires a vacuum pump, a pressure gauge station and precise knowledge of the type and amount of refrigerant for your model.
Replacing the compressor itself is also a complex job that requires soldering copper tubes with a gas torch and subsequent evacuation of the system. An error in the amount of oil or the presence of moisture in the system will lead to rapid failure of the new compressor. In addition, working with refrigerants requires compliance with environmental standards.
If, after all the checks of the electrical circuit, thermostat and relay, the refrigerator still does not work, there is probably a breakdown of the winding insulation or a complex electronic malfunction that requires re-soldering the control board in a service center.
⚠️ Attention: Opening a sealed circuit using refrigerant without a license and equipment is prohibited by law in many countries due to environmental harm. Do not try to simply “add freon” through the puncture without vacuuming.
Frequently asked questions (FAQ)
Is it possible to operate a refrigerator if it makes a lot of noise?
Short-term operation is acceptable, but constant strong noise indicates wear on the compressor bearings or problems with fastening. This can lead to the final failure of the unit, so it is better not to delay diagnostics.
How long should the refrigerator sit after transportation before turning it on?
If the refrigerator was transported in a vertical position, 2-3 hours is enough. If it was lying on its side, you need to wait at least 8-12 hours (or better yet, a day) so that the oil flows into the compressor crankcase and does not enter the circulation circuit.
Why does the refrigerator freeze but does not turn off?
Most often this indicates a freon leak (the compressor is trying to compensate for the lack of cold) or a malfunction of the thermostat, which does not give a signal to stop. Also, the reason may be contamination of the condenser at the back of the unit.
How often do you need to defrost a No Frost refrigerator?
The No Frost system does not require regular defrosting to remove ice, as it does it automatically. However, at least once a year it is recommended to turn it off for hygienic washing and drying to eliminate odors and bacteria.
Is it dangerous to change the start relay yourself?
No, it is not dangerous if you follow a simple rule: be sure to disconnect the refrigerator from the power supply before starting work. The starting relay is an external hinged element that does not require opening the gas circuit.