Sudden failure of refrigeration equipment always becomes an unpleasant surprise, especially when A large supply of food is stored in the cells. If you find that the unit has stopped freezing, do not immediately panic or look for a service center phone number. In many cases malfunction is removable in nature and lies in simple components that you can check yourself.
First of all, it is necessary to carry out an initial diagnosis in order to understand the scale of the problem. Often the reason for the stop is a simple power surge in the network or a failure in the control system, which can be easily fixed by rebooting. However, if simple methods do not help, you will have to delve into the study of technical condition nodes.
In this article we will analyze in detail the algorithm of actions that will help identify the cause of the breakdown. You'll learn to differentiate serious compressor problems from simple thermostat or start relay failures. A competent approach will save time and money, bringing the equipment back to life.
Primary diagnostics and checking the power supply
Before disassembling the back panel, make sure that the problem does not lie in the power source. Sometimes the socket into which the device is plugged in breaks down or simply loses contact. Check for voltage using another electrical appliance, such as a lamp or hair dryer. If the socket is working, inspect the power cord of the refrigerator for visible damage, melting or kinks.
Modern models are often equipped with electronic controls that are sensitive to voltage changes. If there was a surge in the network, control module it could go into protection mode. In this case, you must completely disconnect the device from the network for at least 15-20 minutes. After that, turn it on again and listen to the startup sounds.
⚠️ Attention: If you hear a clicking sound, but the motor does not start, or a humming sound is heard that ends abruptly, turn off the device immediately. Continuing to operate in this mode can lead to burnout of the motor windings.
It is also worth checking the integrity of the fuse if it is located separately in some models, although in most household units this function is built into the general circuit. Make sure the plug fits securely into the socket and does not wobble. Poor contact can cause sparking and heating, which is dangerous for the wiring.
Analysis of the operation of the compressor and start relay
The heart of any refrigerator is the compressor. If, after connecting to the network, you do not hear the characteristic hum of the motor, and the camera is warm, the problem most likely lies here. The compressor may not start for two main reasons: a malfunction of the engine itself or failure starting relay. The relay is responsible for supplying a starting pulse and turning off the starting winding after gaining speed.
To check the relay, you need to remove the back cover at the bottom of the unit (usually the motor-compressor is located there). Carefully remove the plastic box from the side of the compressor. There should be no burning smell inside, and the mechanism itself, when shaken, should not make loud noises, as if there was a metal ball dangling there. If there is sound, the relay definitely requires replacement.
It is important to note that replacing a relay is a simple procedure, but requires precise selection of the model. On the body of the part there is always catalog number or a marking corresponding to the power of the compressor. Installing an unsuitable element will lead to rapid failure of the new component or the motor itself.
If the relay is working properly, but the compressor is humming and does not start, the piston group may be jammed. In rare cases, the method of “warming up” the winding helps, but this is a risky procedure that requires the skills of an electrician. Most often, in such a situation, a compressor replacement or a professional overhaul is required.
Checking the thermostat and temperature sensors
The thermostat (thermostat) is a device that gives the command to turn on the compressor when the temperature in the chamber rises. If this element is faulty, it may simply not “see” that the refrigerator is warm and not start the cooling cycle. In mechanical models, this is a simple part with a capillary tube, in electronic models - NTC sensor.
To check the mechanical thermostat, you can short-circuit the two wires going to it (after disconnecting the refrigerator from the network!). If, after connecting to the network and closing the wires, the compressor starts working, then the thermostat is faulty and requires replacement. In electronic models, diagnostics are carried out with a multimeter by measuring the resistance of the sensor at different temperatures.
Often users themselves change the settings by accidentally turning the control knob to the “0” or “Off” position. Always check the position of the temperature control before starting an in-depth diagnosis. It is also worth inspecting the capillary tube of the mechanical thermostat for damage.
⚠️ Attention: When replacing the thermostat, make sure that the new capillary tube is the same length as the old part. A tube that is too long can be carefully rolled up, but you cannot shorten or extend it - this will disrupt the calibration.
If the refrigerator is equipped with a No Frost system, several sensors may be responsible for temperature control: in the evaporator, in the cooling chamber and in the ventilation zone. Failure of any of them can block the operation of the compressor to avoid freezing.
☑️ Diagnostics of the thermostat
Diagnostics of the defrosting system (for No Frost)
In refrigerators with a system No Frost a common cause of cooling stoppage is a malfunction of the defrost system. If the evaporator heating element is burnt out, the defrost timer is jammed or the defrost sensor gives incorrect readings, the evaporator becomes overgrown with ice. The fan stops moving air, and the chambers become warm, although the compressor can work without interruption.
The first sign of such a breakdown is the appearance of ice on the back wall of the freezer or the absence of cold air from the vents. To check, you need to remove the back panel in the freezer and visually assess the condition of the evaporator. If it is frozen, the defrosting system needs to be “ringed” with a multimeter.
Checking the heating element is carried out in resistance measurement mode. A working heating element should show a resistance in the range of 200-400 Ohms (the value depends on the power). If the device shows one or infinity, the heating element has burned out. The defrost sensor is also checked, which should “ring” only at low temperatures.
Sometimes the problem lies in the defrost timer or an electronic module that does not switch the refrigerator to defrost mode. In older models with a mechanical timer, you can try turning it manually with a screwdriver rod to start the defrosting cycle and check the operation of the heating element.
The secret of quick defrosting
If you find an ice compressor, do not try to break it off with a knife. This may damage the tubes. It is best to remove the panel and pour warm water over the evaporator from a spray bottle or use a hair dryer at minimum power, holding it at a distance of at least 20 cm.
Faults in the start-up protection relay and electrical circuit
The start-up protection relay combines the functions of starting the engine and protecting it from current overloads. Inside there is a bimetallic plate, which is heated by current and opens the circuit when overloaded. If the relay is “stuck” in the open state, the circuit will not close and the compressor will not start.
Often, along with the relay, the capacitor (if there is one in the circuit), which serves to smooth out the starting currents, also fails. Swelling of the capacitor housing or loss of capacity leads to the fact that the motor hums, but cannot turn over. Replacing these components usually solves the hard starting problem.
When diagnosing, it is important to check the integrity of the windings of the compressor itself. To do this, measure the resistance between the contacts on the motor block. Between the starting and operating windings, the resistance should be the sum of the resistances of each winding relative to the common contact. If the resistance is infinitely large - an open circuit, if close to zero - a short circuit.
In models with inverter control, instead of a classic relay, a frequency converter (inverter module) is used. Its diagnosis is more difficult and requires special equipment. However, if the inverter is faulty, it often displays an error code on the display or the indicator flashes.
Table of main symptoms and probable causes
For the convenience of systematizing the data obtained during diagnostics, use the summary table. It will help you quickly navigate the nature of the breakdown based on external signs.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| The refrigerator is silent, there is no light | No power supply, broken cord, faulty socket | Low |
| Buzzing, clicking, does not start | Faulty start relay, jammed compressor | Medium/High |
| Works constantly, does not cool | Freon leak, thermostat is faulty, capillary is clogged | High |
| It freezes slightly, ice freezes | The defrost system is faulty (No Frost), wear of the seal | Average |
| The sound of a running fan is heard, but there is no cold | The evaporator is frozen, the defrost sensor is faulty | Average |
Using this table, you can pre-classify the breakdown. Remember that an accurate diagnosis is only possible after an instrumental check of the components.
Problems with the refrigerant and circuit tightness
The most unpleasant reason why the refrigerator stops working is a leak freon or clogged capillary tube. If there is not enough refrigerant in the system, the compressor works, but does not create the necessary pressure for cooling. You can determine this by touching the condenser (the grille on the back or sides) - it should be warm evenly. If it is cold or only warms up at the outlet of the compressor, most likely the freon has come out.
Leaks often occur in places where the tubes are soldered or due to corrosion of the evaporator (especially in models with a foamed evaporator in the walls). Finding a microcrack on your own without special equipment (leak detector) is almost impossible. In addition, a vacuum pump, a pressure gauge station and a scale are required to charge the system.
A clogged capillary tube is often accompanied by similar symptoms, but the filter drier may become covered with frost, and the compressor may be overloaded. Cleaning the system is a complex technological process that requires purging with nitrogen and replacing the filter.
⚠️ Attention: Freon is a gas that displaces oxygen in high concentrations. If you smell chemicals or gas, ensure the area is ventilated. Do not try to solder the pipes if there is gas left in the system - this can lead to ignition.
If a leak or blockage is confirmed, self-repair is only possible with special tools and skills. In most cases, it is more rational to call a technician, since the cost of equipment for one-time refilling exceeds the cost of a call.
When you need to call a professional technician
Despite the desire to save money, there are situations when independent repairs are impractical or dangerous. If the diagnostics showed a problem with the sealed circuit (leakage, blockage), evacuation and charging of the system is required. This is a job for a professional with a license and equipment.
Also, do not climb inside the compressor. Modern units are often charged with flammable refrigerants (R600a), and any spark during soldering can lead to an explosion. In addition, replacing the compressor requires high-quality soldering of the joints in a nitrogen protective environment to avoid oxidation of the inner surface of the tubes.