The situation when refrigerator compressor works continuously, ignoring the established settings, often takes the owner by surprise. The hum of the motor may not stop for hours or even days, which raises concerns about the safety of food and the condition of the unit itself. In normal operation, the engine must turn on and off at certain intervals, maintaining the set temperature.
Constant wear and tear leads to rapid overheating of the components and can cause expensive repairs if not responded to in time. Bosch refrigerators, Liebherr or Indesit have their own design features, but the basic principles of fault diagnosis are similar for most models. It is important to understand that in some cases this is a normal reaction of the system to external factors, and not a breakdown.
Before calling a technician, it is worth conducting an initial diagnosis yourself. Often the reason lies in trivial things that can be fixed in a few minutes without special tools. However, ignoring the problem can lead to a complete stop of the cooling system.
The influence of ambient temperature
One of the most common reasons why motor-compressor does not go on vacation is the high temperature in the room. If the refrigerator is installed next to a heating radiator, in direct sunlight, or simply in a hot kitchen, the cooling system operates under increased load. The thermostat simply does not record the achievement of the desired temperature inside the chambers, since heat from the outside constantly heats the walls.
In the summer, especially in the absence of air conditioning, it is more difficult for the unit to gain cold. This is normal for older models, but modern devices with energy efficiency class A++ may also experience difficulties at temperatures above +30°C. In such conditions, the cooling cycle is lengthened, and pauses between starts are shortened or disappear altogether.
⚠️ Attention: Installing the refrigerator close to a wall or furniture disrupts the natural circulation of air around the condenser (grid at the back), which inevitably leads to overheating and continuous operation of the engine.
To correct the situation, it is necessary to ensure a flow of fresh air to the rear the wall of the device. It is also worth checking whether the chambers are loaded with room temperature products that require active cooling. After normalization of operating conditions, the engine should return to normal mode.
Malfunctions of the thermostat and sensors
If the room is cool and the compressor hums without interruption, the problem may lie in the control system. Thermoregulator is a device that monitors the temperature in the evaporator and sends a signal to turn the motor on or off. If its contacts are stuck in the “on” position or the sensor fails, the refrigerator will freeze until it stops until you unplug it from the network.
In models with the system No Frost electronic sensors (thermistors) are responsible for the temperature regime. Their readings may be distorted due to oxidation of contacts or broken wiring. The control unit receives incorrect data that the chamber is warm and forces the compressor to work continuously.
Diagnostics of the thermostat often requires testing the contacts with a multimeter. For mechanical regulators, you can try gently tapping the handle or removing it and checking to see if the stem is jammed. In electronic systems, it is often necessary to replace the sensor itself or reflash the control module.
Problems with tightness and seal
Loss of tightness of the refrigeration chamber is the “silent killer” of the compressor. If the rubber seal on the door is worn out, dirty or deformed, warm air constantly flows inside. The system detects an increase in temperature and does not give a command to stop the engine, trying to compensate for heat loss.
You can check the tightness of the door in a simple way using a sheet of paper. Clamp the sheet between the door and the body around the perimeter and try to pull it out. If the paper pulls out too easily or falls off on its own, the seal is not sealing properly in that area. It is also worth inspecting the door hinges: if they are loose, the door warps and does not close tightly.
Often the problem is solved by thoroughly washing the seal with soapy water or blowing it with hot air (hairdryer) to restore elasticity. In more serious cases, it is necessary to replace the rubber or adjust the hinges.
☑️ Checking the tightness
Refrigerant leak and system blockage
When the cooling system occurs freon leak, the pressure drops and the refrigerant ceases to remove effectively warm. The compressor runs idle, trying to build up pressure, but the temperature in the chambers does not drop to the required values. As a result, the motor does not turn off, working at the limit of its capabilities.
A similar picture is observed with clogged capillary tube. Oil oxidation products or moisture entering the system clog the thin channel, preventing the circulation of freon. The motor is humming, the condenser may be only partially hot, but it is not cooling in the freezer.
| Symptom | Possible cause | Nature of motor operation |
|---|---|---|
| Hot condenser | Clogged system or excess freon | Works without stopping, gets very hot |
| Cold condenser | Refrigerant leak | Works constantly, but cools poorly |
| Warm only at the motor | Compressor malfunction | Buzzes, clicks, does not start or nothing |
In both cases, the intervention of a specialist with vacuum equipment is required system, searching for leaks and charging with new refrigerant. It is impossible to eliminate these malfunctions on your own.
Improper operation and loading
Sometimes the user himself creates the conditions for continuous operation of the equipment. Loading a large volume of warm products into the chamber requires a long time to cool them. During this period engine will work without interruption until the temperature balance is achieved.
It is also worth paying attention to the operating modes. If the function Super Freeze (Super Freeze) or Super Coolis activated, the refrigerator is forced to work constantly, ignoring the thermostat readings. This is the standard mode for fast freezing, but if you forget to turn it off, the compressor will work until failure.
⚠️ Attention: Long-term use of the super freezing mode (more than 24-48 hours) can lead to freezing of food and increased wear on the compressor.
Check the control panel and make sure that the indicators are not on emergency modes. Also, do not open the door too often or keep it open for a long time, which is especially important if there are small children in the house.
Compressor wear and electrical faults
The most unpleasant scenario is the physical wear of the compressor itself. motor-compressor. Over time, mechanical parts wear out, valves lose their tightness, and the unit ceases to create the necessary pressure. It works continuously, but does not cool, or cools very little.
Problems with the starting relay are also possible. If the relay contacts are burnt or stuck, they may not open the engine power circuit even after the thermostat has signaled to stop. In this case, the motor hums until the thermal protection is triggered or the winding burns out.
Compressor diagnostics include checking the outlet pressure and current strength. If the current consumption is significantly lower than the rated current, this is a sign of loss of compression. If it is higher, there may be an interturn short circuit or a wedge in the mechanical part.
Frequently asked questions and answers
Can a refrigerator operate without turning off in hot weather?
Yes, in very hot weather (above +30°C), old-style refrigerators or those installed in poorly ventilated niches can operate almost without pause. However, they should still stop periodically (at least for 1-2 minutes). If there are no pauses at all for more than 12 hours, this is a sign of a malfunction.
Is it dangerous to leave the refrigerator running without stopping?
Yes, it is dangerous. Long-term operation without rest cycles leads to overheating of the motor windings, destruction of the oil and jamming of the piston group. Ultimately, the compressor will burn out, and repairs will cost much more than timely maintenance.
Why does a new refrigerator work constantly?
New models, when turned on for the first time or after defrosting, can work for up to 24 hours without turning off, gaining the original temperature. Also check if the Quick Freeze mode is turned on. If the situation does not change after a day, this is a defect or a malfunction.
How to extend the life of a compressor?
Regularly defrost the refrigerator, wash the condenser from behind to remove dust, do not put hot foods in and make sure the doors are tightly sealed. Maintaining the temperature regime in the room is also critical for the longevity of the equipment.