The situation when a refrigerator stops starting always takes you by surprise, especially if there are perishable foods inside. You open the door, you see that it’s warm inside, but you can’t hear the usual hum of the motor, or you can only hear single clicks. At this moment, it is important not to panic, but to consistently analyze the symptoms in order to understand what kind of malfunction you are faced with. Self-diagnosis will help save time and money, and in some cases, avoid calling a technician.
Modern refrigeration units are complex systems where starting the compressor depends on many factors: from the health of the electrical circuit to the pressure in the refrigerant system. If the device is silent, hums, but does not start, or turns on for a couple of seconds and turns off, these are signals of different types of breakdowns. In this article, we will analyze in detail the main reasons why the refrigerator does not start, and how to eliminate them on your own.
The first thing that needs to be done is to understand the nature of the operation (or inaction) of the equipment. Compressor is the heart of the refrigerator, and it is its behavior (or lack thereof) that is the main indicator of the problem. Let's look at the main scenarios for the behavior of equipment.
The refrigerator is silent and shows no signs of life
The most banal, but often ignored scenario is the complete absence of sounds. If you don't hear any humming, clicking or fan operation, the problem most likely lies in the absence of power supply. First of all, check that the plug is firmly inserted into the socket and that there is voltage in the socket itself. To do this, you can connect any other device to it, for example, a lamp or hair dryer. If the socket is working, inspect the power cord for kinks or damage.
In some refrigerator models, especially built-in or expensive brands like Liebherr or Bosch, the internal protection may trip or the fuse on the control board may blow. It is also worth checking whether the circuit breaker in the apartment's electrical panel has been knocked out. The lack of power can be caused by a power surge in the network, which damaged the control unit control unit.
If everything is in order with the socket and wire, but the refrigerator is still silent, the light switch in the doorway may be faulty, which in some designs opens the control circuit when the door is open, although more often it is responsible only for the lamp. However, if the operating logic of the electronics is broken, the controller may block the start.
Clicks are heard, but the compressor does not start
If you hear a characteristic click, followed by a hum that lasts 1-3 seconds, and then another click and silence, this is a classic symptom of a malfunction of the start-up relay or the start protection relay itself. compressor. Start relay responsible for supplying a starting pulse to the motor winding. When it fails, the engine cannot gain the required speed and goes into protection.
The second probable cause of such symptoms is interturn short circuit the compressor windings or its jamming. In this case, the current drawn by the motor increases sharply, the thermal protection opens the circuit, and you hear a clicking sound. Repeated startup attempts can finally finish off the compressor, so it is better to stop switching on and off.
⚠️ Attention: If you observe a “click-buzz-click” cycle, do not try to start the refrigerator repeatedly. This can lead to overheating of the windings and complete combustion of the motor, which will make repairs economically unfeasible.
To diagnose the relay, it must be removed and shaken. If a ringing sound is heard inside, it means the contacts are damaged and the part must be replaced. It is also worth checking the contacts for oxidation. Replacing start relay is one of the most common and inexpensive procedures in refrigerator repair.
The motor hums, but does not start: problems with pressure and jamming
When the compressor hums continuously or intermittently, but does not start, this often indicates that it cannot overcome the pressure in the system or is mechanically seized. Unlike relays, the problem here may be deeper. If the humming is quiet and monotonous, the tightness of the system may have been broken and it has come out. The sensors detect a lack of pressure and do not allow it to start, or the compressor is idling. freon. Sensors detect a lack of pressure and do not allow it to start, or the compressor runs idle.
Another reason is water hammer or oil getting into the cylinder, which blocks the piston. In such cases, the engine tries to turn over, hums, heats up, but cannot move the pistons. This condition is often called "compressor wedge". Wedging it on your own is difficult and risky; special tools and skills are required.
It is also worth paying attention to the temperature of the compressor housing. If it is hot to the touch, but the refrigerator does not cool, this is a sure sign that heat exchange it is broken or there is not enough refrigerant in the system. In modern models with inverter compressors, a quiet hum without starting may indicate a malfunction of the inverter board.
Is it possible to revive a jammed compressor?
There is a method of “dialing” with increased voltage, but at home it is dangerous. Craftsmen sometimes use special devices to pierce a wedge, but success is not always guaranteed. Most often, jamming means the need to replace the unit.
Malfunction of 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 it is faulty, the command simply does not arrive. In mechanical models, this is a contact group that could oxidize or stick. In electronic models, they are responsible for this temperature sensors (thermistors).
If the thermostat is stuck in the "Off" position, the refrigerator will think that it is already cold inside and will not start. You can check a mechanical thermostat by closing its contacts directly (after disconnecting the refrigerator from the network!). If the engine starts running after this, the problem is in the thermostat. In electronic systems, you will need a multimeter to check the resistance of the sensors.
Often users accidentally change the settings by turning the thermostat knob to the extreme position or activating the "Vacation" or "Eco" mode. In this case, the refrigerator does not start because the program does not require cooling. Check the settings on the display or the position of the adjustment wheel.
☑️ Diagnostics of the thermostat
Problems with the electronic control module
In modern refrigerators No Frost and models with a display, the electronic one is responsible for starting control module. If the tracks on the board are burned out, capacitors are swollen, or a firmware failure occurs, the command to start the compressor will not be generated. Outwardly, this may look like burning indicators or, conversely, a complete lack of response from the panel.
Often the module suffers from power surges or moisture ingress (for example, during defrosting or drainage leakage). A visual inspection of the board may reveal obvious signs of burning or corrosion. However, even if the board is externally intact, the compressor control triac or relay on the board itself could fail.
Repairing an electronic module requires qualifications and soldering equipment. In some cases, a complete reset of the settings (Hard Reset) helps, but if the problem is hardware, the board will need to be replaced or professionally resoldered.
Comparative table of symptoms and causes
For ease of diagnosis, let’s summarize the main symptoms in a table. This will help you quickly navigate the nature of the malfunction and decide on further actions.
| Symptom | Probable cause | Difficulty of repair | Required actions |
|---|---|---|---|
| Complete silence, no light | No power, broken cord, blown fuse | Low | Check the socket, cord, circuit breaker in the panel |
| Clicks, buzzing for 2-3 seconds | The starting relay is faulty, the compressor is jammed | Medium/High | Replace the relay, check the compressor |
| Buzzes, but does not start | Freon leak, hydrocline, board fault | High | Call a technician to diagnose the system |
| Silent, but there is light | Thermostat is faulty, electronics failure | Medium | Check the thermostat, reset the settings |
Frequently asked questions about starting the refrigerator (FAQ)
Is it possible to start the refrigerator without a starting relay?
Theoretically, if you apply voltage directly to the working and starting windings, the compressor will start. However, without a relay (or a capacitor in some circuits), the motor will not develop the required power and will quickly burn out due to overheating of the windings. It is absolutely forbidden to operate the refrigerator without a working starting device Why does the refrigerator not start after defrosting?.
Why doesn't the refrigerator start after defrosting?
If the refrigerator does not turn on after defrosting, moisture may have gotten into the electrical contacts or sensor connectors. The defrost timer (in No Frost systems) could also be triggered and stuck in the “defrost” position. Allow the equipment to dry completely overnight. If this does not help, check the timer and defrost sensor.
How long should the compressor operate normally?
In normal mode, the compressor operates cyclically. The operating time is usually from 10 to 30 minutes, followed by a pause (rest) lasting from 15 to 40 minutes, depending on the load of the chambers and the ambient temperature. If the refrigerator runs non-stop for days, this is a sign of a malfunction.
Does the room temperature affect startup?
Yes, it does. Most refrigerators are designed to operate in climate class SN-N (from +10°C to +32°C). If the room is colder than +10°C (for example, on an unheated balcony in winter), the oil in the compressor thickens and it may not start or may be overloaded. Also, in a cold room, the thermostat may not “see” the need for cooling.