Situation, when Bosch refrigerator does not turn off and continues to hum without interruption, it causes anxiety in any owner. This is not just an annoying noise, but also a signal that the unit is operating in extreme mode, consuming excess electricity. The compressor, which is the heart of the system, wears out much faster if it has to work without the required rest cycles.
Owners often notice that appliances NoFrost or a classic model with a drip system begins to behave strangely after a power surge or moving. However, the reasons may lie in simpler things, such as a door that is not tightly closed or installation next to heating appliances. Understanding why Bosch refrigerator does not turn off will allow you to make the right decision: call a technician or fix the problem yourself.
It is important not to ignore the first signs of motor overheating, as this can lead to expensive repairs or complete replacement of the compressor. In this article we will examine in detail the mechanical and electronic causes of cycle failure. You will learn how to check the tightness of the circuit and diagnose sensor malfunctions.
Primary diagnostics and external factors
Before you panic and look for a service center, you need to eliminate common operating errors. Often the answer to the question why Bosch refrigerator does not turn off lies in a violation of the installation or use rules. If the unit is too close to a wall or heat source, heat transfer is disrupted and the motor is forced to wear out.
Pay attention to the door sealing rubber bands. If they are worn out, dirty, or simply do not fit tightly, warm air constantly enters the chamber. Sensors detect the temperature increase and command the compressor to operate continuously. This is the most common reason, which is easy to check visually and tactilely.
⚠️ Attention: If you notice that the rubber seal is cracked or has lost elasticity, do not try to glue it with superglue. This will not solve the tightness problem and may permanently damage the material. A complete replacement of the seal is required.
It is also worth checking the temperature conditions. If you accidentally set the regulator to maximum cooling ("Super Freeze" mode or value 1), the equipment will work without stopping. In modern models Bosch with electronic control, settings failure could occur due to a power surge.
Problems with the thermostat and temperature sensors
One of the key parts that controls the on and off cycles is the thermostat. In older models this is a mechanical device, in new ones it is an electronic sensor NTC. If the thermostat is faulty, it may “stick” in the “on” position, transmitting a false signal to the control module that the temperature in the chamber is too high.
Diagnostics of a mechanical thermostat requires care. It is necessary to remove the casing and check the contacts. If the device rings constantly, regardless of temperature, it must be replaced. In models with a system NoFrost temperature control is often controlled by an air sensor, which can oxidize or become dirty.
Symptoms of a sensor malfunction are usually accompanied by an incorrect display of the temperature on the display (if there is one) or a complete lack of response to changing settings. Sometimes Bosch refrigerator does not turn off precisely because the “brain” of the device does not receive reliable data about the microclimate inside the chambers.
- 🔍 Checking contacts: Make sure that the wires going to the thermostat are securely fastened and have no signs of oxidation.
- 🌡️ Ice test: For mechanical thermostats, you can test by placing the sensing tube in a container of ice. If there is no click after 15-20 minutes, the part is faulty.
- 🔌 Electronics: In electronic models, a sensor error is often indicated by a code on the display or blinking indicators.
Malfunctions of the compressor and start relay
If external factors and sensors are working properly, the problem may lie in the very heart of the refrigerator - the compressor. When Bosch refrigerator does not turn off, but does not cool enough, this may indicate a loss of motor power or problems with the starting mechanism. The compressor tries to build up pressure, but cannot, so it does not receive a signal to stop.
The start relay is a small part that helps start the motor. If it is burned out or stuck, the compressor may hum, but not start, or work in an abnormal mode. In some cases, the relay “sticks” in the on state, constantly supplying current to the compressor windings.
Experts note that inverter compressors, which are equipped with many modern models Boschbehave differently. They do not turn off completely, but only reduce the speed. However, if you hear the characteristic sound of constant operation at high speeds, this is a cause for concern.
What is an inverter compressor?
The inverter motor does not stop completely after reaching the desired temperature. It goes into minimum speed mode, maintaining the cold. This is fine. The alarm should be raised if it works at full power for days.
Freon leak and capillary system blockage
One of the most serious reasons why Bosch refrigerator does not turn off is a refrigerant (freon) leak. If a microcrack has formed in the system, the gas gradually evaporates. The pressure drops and the compressor works non-stop, trying to compensate for the lack of refrigerant, but the temperature does not drop to the set values.
A clogged capillary tube gives a similar effect. Oil and freon circulate in the system, and if an ice plug forms in the tube or is clogged with wear products, normal circulation is disrupted. The motor overheats, trying to push the refrigerant through the obstacle.
⚠️ Attention: Independent refilling with freon is impossible and dangerous without special equipment. In addition, you first need to find and eliminate the leak, otherwise the gas will escape again after a short time.
Signs of a leak or blockage are often:
- ❄️ Weak cooling: Products deteriorate, despite the constant operation of the motor.
- 🔥 Hot condenser: The grill at the back may be hot unevenly or, conversely, cold.
- 💧 Ice in the chamber: In models NoFrost a “fur coat” may grow on the evaporator, which is not visible from the outside.
Comparison of symptoms of malfunctions
For ease of diagnosis, we have compiled a table that will help compare symptoms with possible causes. This will allow you to more accurately describe the problem to a technician or understand the scope of work when doing your own repairs.
| Symptom | Probable cause | Difficulty of repair | Need for a technician |
|---|---|---|---|
| Refrigerator hums, but does not cool | Freon leak or blockage | High | Mandatory |
| Motor is hot, does not turn off | Fault thermostat | Average | Desirable |
| Continuous operation after defrosting | Air has entered the system or has not dried out | Low (standby) | No |
| Clicking and buzzing without starting | Start relay or compressor | Medium/High | Yes |
| Works without stopping, cold yes | Loose door fit | Low | No |
Operating errors and operating modes
Sometimes users themselves switch the equipment into continuous operation mode, forgetting about it. For example, the “Super Frost” function, activated by a button with an indicator, makes Bosch refrigerator work without interruption for 24-48 hours. After this, the timer should automatically turn off the mode, but if the function is stuck, the motor will hum constantly.
Frequently opening the door or loading a large amount of warm food also causes the compressor to operate for a long time. In this case, the equipment simply performs its function - it cools the volume. However, if you have loaded a pot of soup and the refrigerator has been humming for the second day, it is worth checking whether the quick freeze button is stuck.
In models with a display, a software failure of the controller may occur. In this case, a complete system reboot helps. It is necessary to disconnect the appliance from the network for 10-15 minutes, and then turn it on again. This action resets control logic errors.
☑️ Checklist before calling the technician
When professional repairs are needed
There are a number of situations where independent actions can only do harm. If Bosch refrigerator does not turn off due to problems with the tightness of the system, evacuation and refrigerant charging are required. These are complex technical procedures that require a pressure gauge station and skills in soldering copper tubes.
Replacing a compressor is an even more complex process, including overhauling the entire refrigeration system, replacing the filter-drier and fine-tuning the pressure. Trying to do this “on your knees” will lead to repeated breakdown in a short time.
You should also contact a professional if you hear extraneous knocks, grinding noises, or if the motor turns off a couple of seconds after starting with a loud click. These are signs of mechanical destruction of the compressor components or a serious electrical malfunction.
Is it possible to use a refrigerator if it does not turn off?
Short-term operation (several hours) is acceptable, but long-term operation in this mode is dangerous. The compressor may burn out and food may spoil due to temperature imbalance. In addition, this is a fire hazard if the wiring overheats.
How long should a Bosch refrigerator normally operate?
In normal mode, the operating coefficient is about 30-40%. This means that out of 60 minutes he works for 20-25, and rests for 35-40 minutes. In summer or at high load, the operating time can increase to 50-60%.
Why does a new refrigerator work constantly?
The first start can last up to 24 hours. At this time, active cooling of the volume and walls occurs. If after a day of operation the temperature has not stabilized and the motor does not rest, this is a defect or damage during transportation.