The situation when you you open the door of the refrigerator, and it’s warm inside, the food begins to deteriorate, and the unit itself is silent or makes only a quiet click, always catching you by surprise. Compressor failure - this is the most critical breakdown, which requires immediate intervention, since without refrigerant circulation, the temperature regime is disrupted in a matter of hours. Primary panic is understandable, but in the first minutes it is important to keep cool and carry out competent initial diagnostics in order to understand the scale of the problem.
Often equipment owners begin to frantically turn the temperature regulators or knock on the body, which is the case with modern models Indesit or LG absolutely useless and even harmful. If after turning on again after 10-15 minutes, the engine is silent, but the light inside is on - the problem lies in the electrical starting circuit or mechanical jamming of the components. In this article we will analyze in detail all possible scenarios, from a banal power surge to a complex inter-turn short circuit of the windings, so that you can make an informed decision about calling a technician or doing your own repairs.
Understanding the physics of the process will help you avoid unnecessary expenses. The refrigerator motor is the heart of the system, and if it does not beat, it means either there is no impulse (electricity) or there is an insurmountable resistance (mechanics). Let's one by one exclude simple reasons in order to focus on complex ones.
⚠️ Attention: Before any manipulations with the electrical components of the refrigerator, be sure to unplug the device from the mains. Working with 220V voltage without the proper skills and tools is deadly.
Primary diagnostics and checking the power supply
Before suspecting a breakdown of start relay or the motor itself, you must ensure the integrity of the external circuit. Often the problem lies not inside the unit, but in the outlet or surge protector. Check if the outlet is working by connecting another electrical appliance to it, such as a hair dryer or lamp. If the socket is working, inspect the power cord of the refrigerator for melting, kinks or signs of pet bites, which is especially important for models installed in the kitchen with free access to the floor.
Modern electronically controlled refrigerators, such as Bosch or Siemensmay not start the compressor due to a failure in the control module, even if there is voltage in the network. In this case, errors may appear on the display or, conversely, the panel may be completely dead. Try a full system reboot: unplug the device for 15-20 minutes, and then turn it on again. This action will reset temporary controller errors.
If after turning on you hear a characteristic click, followed by a buzz lasting 3-5 seconds, and then another click and silence, this is a classic sign of an attempt to start. The engine is trying to start, but something is stopping it. In 80% of cases with such symptoms, the start protection relay or a jammed compressor is to blame.
It is also important to check the condition of the thermostat. If it is set to "0" or "Off", the compressor power circuit is open. For mechanical models, try turning the knob smoothly, listening for a quiet click inside the case. The absence of a click when cranking may indicate a malfunction of the thermostat itself, which simply does not send a signal to start the engine.
Faulty start-up relay
Start relay is a small but critical element that supplies a high starting current to the engine windings at the time of start and turns off the starting winding after a set of revolutions. It is this component that most often fails in refrigerators older than 5-7 years. Inside the relay there is a coil and contacts that burn out or stick over time, which is why the engine does not receive the necessary impulse to start.
To diagnose the relay, it must be removed from the compressor. On most models it is attached to three pins of the motor windings and secured with a bracket or latches. Carefully disconnect the wires and remove the part. A visual inspection often gives the answer: if carbon deposits, melted plastic are visible inside, or a burning smell is felt, the part requires replacement. Some relays have a posistor (ceramic element) inside, which changes resistance when heated; its destruction also leads to startup failure.
Replacing the relay is one of the most accessible repair procedures. The main thing is to choose an analogue that is identical in characteristics and method of fastening. Universal relays exist, but they do not always work correctly with specific compressor models Atlant or Stinol, which can lead to repeated breakdowns.
Is it possible to temporarily start a refrigerator without a relay?
Theoretically, you can close the contacts manually, but this extremely dangerous. Without thermal protection, the compressor will burn out in a few minutes if it jams, and the risk of electric shock with this method is maximum.
It is worth noting that a burned out relay is often a consequence, not a cause. If the new element also quickly fails, then the problem lies in the motor itself, which consumes too much current or has an interturn short circuit.
Problems with the thermostat and sensors
The thermostat (thermostat) is a switch that opens and closes the compressor power circuit depending on the temperature in the chamber. If the contacts inside the thermostat are oxidized or burnt, the circuit will not close and the engine will not start, even if the chamber is warm. In refrigerators with electronic control, the role of a thermostat is performed by temperature sensors, the signal from which is processed by an electronic module.
Diagnostics of a mechanical thermostat is simple: you need to connect the two wires suitable to it directly (bypassing the regulator itself). If after this manipulation the refrigerator turns on and starts working, the thermostat is faulty. When working with electronic sensors Samsung or Whirlpool you will need a multimeter to measure resistance. Resistance values should change depending on the temperature of the sensor (usually checked at room temperature and when cooled).
A common mistake is to ignore the thermostat capillary tube. It must be tightly secured in the evaporator. If the tube has jumped out of its seat, the thermostat “does not feel” the real cold in the chamber and may not turn on the compressor on time, or, conversely, not turn it off.
Failure of the electronic module control
In modern two-chamber refrigerators and models with a system No Frost an electronic control module is responsible for starting the engine. This is the “brain” of the device, which receives signals from sensors and makes a decision to turn on the compressor. If the tracks on the board are burnt out, the capacitors are broken, or there is a problem with the firmware, the start command simply will not be sent to the start relay.
Visually, a module malfunction can often be determined by external signs: swollen capacitors, blackened areas of the board, traces of moisture or insects. However, the board often looks perfect externally, and diagnostics require special equipment and knowledge in radio electronics. Self-repair of the module is only possible if you have soldering experience and a circuit diagram.
If the module is faulty, the refrigerator may behave strangely: the light is on, the fan is running, the temperature is displayed, but the compressor is silent. Or an error code lights up on the display, indicating a problem with the compressor circuit.
⚠️ Attention: Electronic modules are very sensitive to voltage surges. If the voltage in your network changes frequently, it is recommended to install a stabilizer to protect the expensive electronics of the refrigerator.
In some cases, the module may be working properly, but “glitch” due to static electricity. An attempt to reboot (disconnect from the network for 20-30 minutes) sometimes helps to bring the device back to life if the failure was software.
Mechanical jamming of the compressor
The most unpleasant diagnosis is this compressor jamming. Inside the sealed housing of the motor-compressor there are rubbing pairs (piston and cylinder, shafts), which are lubricated with special oil. If the oil has leaked, thickened, or debris has entered the system, the metal parts are welded together under the influence of temperature and pressure. The engine tries to turn over, hums, but physically cannot move.
You can diagnose jamming by a characteristic sound: a powerful, strained hum for several seconds, turning into a protection click. If you touch the compressor housing (carefully, it may be hot) during this startup attempt, it will vibrate strongly. Sometimes the “wedging” method by applying increased voltage or pulse helps, but this is a temporary measure that will only delay the final death of the unit.
The causes of jamming often lie in long-term downtime of the equipment. If the refrigerator has been turned off for several months, the oil has flowed into the crankcase, and starting without preheating (which cannot be done normally) can lead to dry friction and jamming.
☑️ Signs of compressor jamming
If the compressor is jammed, replacing it is the only solution. Repairing a hermetically sealed unit at home is impossible and economically unfeasible.
Malfunctions of motor windings
The electrical part of the engine consists of starting and operating windings. As a result of voltage surges, insulation aging or overheating, break or interturn short circuitmay occur. If there is a break, the circuit breaks and the current simply does not flow - the refrigerator is silent. When closed, the current increases many times over, which leads to instantaneous activation of the thermal protection relay and a characteristic click.
The windings are checked with a multimeter in resistance measurement mode (Ohms). It is necessary to ring the contacts on the compressor block. There should be no resistance (or it should be infinite) between the starting and operating windings, as well as between each winding and the housing (for breakdown). Normal resistance values vary depending on the power of the motor, usually from 10 to 40 Ohms.
If the tester shows zero (short circuit) or infinity (open) - the motor has burned out. It is almost impossible to restore such a motor by rewinding at home; the entire assembly needs to be replaced.
| Symptom | Probable cause | Sound character | Solution |
|---|---|---|---|
| Silent, light is present | Open circuit, thermostat, module | Absent | Replacing thermostat/relay/module |
| Buzzing for 3-5 seconds, clicking | Stuck, relay, short circuit | Strained hum | Replacing the relay or compressor |
| Cracking and sparking | Insulation breakdown, poor contact | Crackling, humming | Urgent repair, risk of fire |
| Buzzing, but does not start | Low voltage, weak relay | Quiet hum | Stabilizer, replacement relay |
Starting methods and prevention
There is a method of forcing the compressor to start, bypassing the relay, using a button or direct connection to check its mechanical part. However this method is dangerous and requires qualifications. If the compressor is seized, such a start can lead to rupture of pipelines or fire of wiring. Therefore, we do not recommend using it without understanding the processes occurring inside the motor.
To prevent starting problems, it is important to ensure good ventilation of the rear wall of the refrigerator. If the condenser (grid at the back) is covered with dust, the compressor runs overheated, which accelerates the aging of the oil and winding insulation. Regular cleaning behind the refrigerator prolongs the life of the engine.
You should also avoid frequently turning the appliance on and off. The minimum break between turning off and turning on again should be at least 5-10 minutes. This is necessary to equalize the pressure in the system and cool the thermal relays. Ignoring this rule is a sure way to rapid failure of the starting equipment.
If you are faced with a starting problem, do not rush to buy a new refrigerator. In most cases, replacing a relay or thermostat brings the equipment back to life for minimal money. But if the compressor itself burns out, it is worth weighing the cost of a new motor and the work of a technician against the price of a new unit.
Why does the refrigerator click but does not turn on?
The click indicates the operation of the thermal protection relay. It opens the circuit because the current in the motor is too high. This happens when the compressor is jammed, the start relay is faulty, or the windings are shorted between turns.
Is it possible to replace the compressor yourself?
Theoretically, yes, but this requires the skill of soldering copper pipes, a vacuum pump for pumping out air and knowledge of refilling with freon. Without special equipment and a license to work with refrigerants, high-quality repairs are impossible.
How much does fault diagnosis cost?
The cost of diagnostics varies depending on the region and service, but usually it ranges from 500 to 1500 rubles. If you agree to repair, diagnostics are often carried out free of charge.
What to do if the compressor burns out?
You need to call a specialist for an accurate diagnosis. If winding combustion or jamming is confirmed, the compressor will need to be replaced with one of similar power and refrigerant. Older models may require replacing the filter-drier and re-cooking the circuit.