The situation when the refrigerator Biryusa hums and freezes, but does not turn off, is a classic sign of a serious malfunction in the thermoregulation system. In normal mode, the unit should cyclically gain cold and stop to give the motor a rest. If the compressor operates continuously, this leads to excessive energy consumption and accelerated wear of expensive components.
Often owners notice that the food in the chamber begins to freeze, turning into ice blocks, or, conversely, the temperature remains not low enough, despite the constant hum of the motor. Continuous operation - this is a signal that the “brain” of the refrigerator does not receive the command to reach the set temperature. In this article, we will analyze in detail the mechanical and electrical causes of such a malfunction.
Understanding the principle of operation thermostat and sensors will help you determine whether you can solve the problem yourself or whether you will need to call a technician. Ignoring this symptom can lead to complete failure of the compressor, the replacement of which is often not economically feasible.
Problems with the thermostat (thermostat)
The most likely reason that your refrigerator Biryusa is not stops, the thermostat has failed. This mechanical or electronic sensor is responsible for opening the compressor power circuit when a certain temperature inside the chamber is reached. If the contacts are stuck in the closed position, the motor will run endlessly.
In older models Biryusa mechanical thermostats were installed with a bellows tube filled with freon. Over time, the bellows could lose its seal or become deformed, causing it to stop transmitting pressure to the contacts. Modern models with the No Frost system use electronic sensorswhich can also give incorrect readings due to oxidation of contacts or damage to the wiring.
⚠️ Attention: Before replacing the thermostat, make sure that the sensor tube pressed tightly against the evaporator. If it moves away, the sensor will “think” that the chamber is warm and will not turn off the compressor.
Diagnostics of a mechanical thermostat is often carried out by the method of exclusion. If you turn the control knob to the “0” or “Off” position, the compressor should stop. If this does not happen, the problem may lie deeper in the electrical circuit or the motor itself.
Temperature sensor malfunctions (for models with electronic control)
In refrigerators Biryusa new generation equipped with an electronic control module, a special one is responsible for temperature control. thermistor. This is a resistor whose resistance changes depending on the ambient temperature. If the sensor is “lying” and shows the module that the chamber is +10°C instead of the real -18°C, the program will keep the compressor on.
Often the problem lies not in the sensor itself, but in poor contact in the connector or damage to the wires leading to him. Moisture, condensation and temperature changes contribute to the oxidation of contacts. It is difficult to visually determine the malfunction; it requires testing with a multimeter and comparing the readings with reference resistance values.
It is also worth checking whether the settings in the electronic control unit are correct. Sometimes after a power surge control module it can go into emergency mode or reset the calibration, which will lead to incorrect operation of the entire cooling system.
How to check the sensor with a multimeter?
To check the temperature sensor, you need to disconnect the refrigerator from the network, remove the sensor and cool it (for example, put in the freezer for 15 minutes). The resistance of a working thermistor should change as it cools. If the readings do not change or the device shows a break, the sensor is faulty.
Freon leakage and problems with tightness
Paradoxically, sometimes the refrigerator Biryusa does not turn off precisely because it has stopped freezing normally. When refrigerant (freon) leaks from the circuit, the pressure in the system drops. The compressor tries to compensate for the lack of cold by operating in continuous mode, but does not reach the desired temperature.
A leak can be determined by indirect signs. For example, if the condenser (grid at the back) is only partially warm or completely cold, and the evaporator inside the chamber is covered with an uneven layer of frost (or “cries” in one corner), this is a sure sign lack of freon. Also, rust or traces of oil may appear on the tubes where the circuit is damaged.
Another reason is a violation of the tightness of the chambers. If the sealing rubber on the door is worn out, dirty, or the door itself is warped, warm air constantly enters the chamber. The sensor detects an increase in temperature and commands the compressor to work without stopping.
☑️ Checking the door tightness
Clogged capillary tube or filter drier
Refrigerant circulation system in refrigerators Biryusa includes a thin capillary tube and a filter drier. Over time, microscopic blockages may form in the system due to oil oxidation products or moisture. This prevents the normal circulation of freon.
When clogged, the compressor works with increased load, trying to push the refrigerant through the plug. The compressor outlet pressure increases and the cooling capacity decreases. As a result, the refrigerator hums, heats up, but does not turn off, since the temperature in the chamber does not drop to the set value.
It is difficult to diagnose a blockage at home, since this requires opening the circuit, purging with nitrogen and replacing the filter. Often a sign of a blockage is a hot filter drier (copper barrel) and a cold, almost icy section of the tube before or after it.
Faults of the compressor and start relay
The compressor itself is the “heart” of the refrigerator. If its mechanical part is worn out (for example, compression of the piston group is lost), it may hum and consume current, but not create the necessary pressure in the system. In this case motor-compressor it will work continuously, but will not produce cold.
It is also worth paying attention to the starting relay. If the contacts in the relay are stuck or burnt, they may not open even after the thermostat has signaled to stop. This leads to the fact that power is constantly supplied to the motor windings.
It is important to distinguish the nature of the sound of a working unit. A healthy compressor hums monotonously and quietly. If you hear a metallic clanging, knocking or excessively loud hum, this may indicate that the engine is running dry or has mechanical damage internally. Biryusa hums monotonously and quietly. If you hear a metallic clanging, knocking or excessively loud hum, this may indicate that the engine is running dry or has mechanical damage internally.
The influence of external factors and operating conditions
Sometimes the reason lies not in the breakdown, but in the operating conditions. If the refrigerator Biryusa is installed next to heating radiators, in direct sunlight or in a very hot room, the cooling system may not be able to cope with the heat flow. The compressor will work at its limit, trying to compensate for the heat.
Loading the refrigerator with warm food also causes the motor to run for a long time. However, in this case, it should still turn off after freezing. If you put a pot of hot soup, the unit may hum for several hours, which is a normal reaction to a sharp increase in temperature inside the chamber.
Insufficient ventilation of the rear wall is a common installation mistake. There should be a distance of at least 5-7 cm between the refrigerator body and the wall for free air circulation. If the radiator is pressed against the wall, heat is not dissipated and operating efficiency drops.
Table: Comparison of symptoms and possible causes
For ease of diagnosis, below is a table that helps compare the observed symptoms with probable malfunctions.
| Symptom | Probable cause | Difficulty of repair | Necessary actions |
|---|---|---|---|
| The refrigerator freezes too much, there is no ice a lot | Thermostat is faulty (contacts are stuck) | Low | Replacing the thermostat |
| The compressor is humming, there is no cold, the condenser is cold | Leakage freon or blockage | High | Search for leaks, refill with freon |
| Buzzes, but does not start or stalls immediately | Faulty start relay or compressor | Average | Replacing the relay, checking the windings |
| Works constantly, but the temperature is normal | The door seal is broken | Low | Replacement seal, door adjustment |
When you need to call a technician
If you have checked the thermostat, made sure that the door is tight and normal operating conditions, but the problem persists, most likely, specialist intervention is required. This is especially true for work related to refrigerant and opening a sealed circuit.
Self-filling with freon without evacuation of the system and using the correct type of oil will lead to rapid failure of the refrigerator. Biryusa failure. Professionals also have equipment for accurate diagnostics of electronic control boards, which are extremely difficult to check at home.
⚠️ Attention: By opening the refrigerator circuit yourself, you risk releasing harmful substances into the atmosphere and completely ruining the unit. Working with freon requires a license and special equipment.
Remember that timely contacting a service center can save the compressor from burning out. If the motor works without stopping for days, its resource is exhausted in a matter of days, and replacing the motor is one of the most expensive procedures in the repair of household appliances.
How much does the repair cost?
The cost of repair depends on the model and the malfunction. Replacing the thermostat will cost less than finding the leak and refilling with freon. The exact price can only be found out after diagnostics by a technician at home.
Frequently asked questions (FAQ)
Is it possible to operate the Biryusa refrigerator if it does not turn off?
Short-term - yes, but this is emergency mode. Long-term operation without stopping will lead to overheating of the compressor windings, jamming of the motor and its complete failure. It is also possible that food may freeze.
Why did the refrigerator start working without stopping after defrosting?
Perhaps the temperature sensor or thermostat was damaged by water during defrosting. The thermostat setting may also have gone wrong. Check to see if the sensor tube has moved away from the evaporator wall.
How can you tell if the compressor has burned out and not just a stuck relay?
If you hear a click when you turn it on, the hum lasts 5-10 seconds, then a second click follows and silence (and so on in a circle) - most likely the problem is in the starter relay or compressor jammed. If the motor hums smoothly, but does not cool, there may be a freon leak or loss of compression.
Does the temperature in the room affect the operation of the refrigerator?
Yes, refrigerators Biryusa are designed to operate in a certain climate class (usually SN-T). If the room is too hot (above +30°C) or too cold (below +10°C), the thermostat may not work correctly, without giving a command to stop.