The situation when your Bosch refrigerator stops turning off and buzzes around the clock causes reasonable concern. This is not just an annoying noise, but also a signal that the cooling system is working in emergency mode, trying to achieve the set temperature parameters. In the normal operating cycle, the compressor turns on, cools the chambers to the desired level and turns off to rest. If the motor hums without interruption, it means that the target temperature inside has not been reached or the sensors are transmitting incorrect signals.
Ignoring this problem can lead to serious financial losses. Firstly, your electricity bill will increase significantly, since the refrigerator is one of the most energy-consuming appliances in the house. Secondly, constant wear and tear reduces the resource compressor, which is the heart of the unit. Thirdly, products in such conditions may begin to deteriorate due to a violation of the temperature regime or, conversely, freeze in the refrigerator.
In this article we will examine in detail the main reasons why Bosch refrigerator can work without stopping, and consider diagnostic methods. We will cover both simple operating errors that you can fix yourself in a couple of minutes, as well as complex technical faults that require the intervention of a specialist. Understanding the nature of the problem will help you make the right decision on further actions.
Violation of the tightness of chambers and seals
The most common and easily remediable reason for the constant operation of the compressor is a violation of the tightness of the internal space. If warm air from the room freely penetrates into the chambers, temperature sensor records an increase in degrees and commands the motor to work continuously. Often the culprit is the rubber seal on the door. Over time, the rubber dries out, cracks, or simply becomes contaminated with grease, which is why the door does not fit tightly.
To check the tightness, you can perform a simple test with a sheet of paper. Squeeze the sheet between the seal and the refrigerator body and try to pull it out. If the paper comes out easily, without resistance, it means that the seal is broken in this place. Also carefully inspect the rubber itself for microcracks, tears or deformations. Sometimes it is enough to simply wash the seal thoroughly with warm water and soapy water to remove adhering fat and restore the seal.
However, the problem may lie not only in the rubber. Door misalignment due to improper installation or loose hinges also leads to loose closure. In this case, heat loss becomes critical, and Bosch refrigerator cannot reach the stop mode. If you notice that the door is sagging or skewed, you need to adjust the hinges to restore the geometry of the case.
⚠️ Attention: If the seal is physically damaged (torn or severely deformed), no amount of cleaning will help. In this case, a complete replacement of the rubber circuit is necessary, otherwise the compressor will burn out from overload.
In addition, check whether the food interferes with closing the door tightly. It often happens that a large package or a pulled out shelf prevents normal closure, leaving a small gap. This creates a constant flow of warm air, forcing the cooling system to work non-stop.
Incorrect installation and temperature conditions
Errors during the initial installation of the refrigerator often cause its unstable operation. If the unit is too close to a wall or heating appliances, air circulation around the condenser is disrupted. Heat transfer deteriorates, and the refrigerator cannot effectively discharge heat, which forces the compressor to work longer than expected to achieve the desired temperature.
It is also important to take into account the ambient temperature (temperature environment). If the refrigerator is installed in an unheated room where the temperature drops below +10°C, or, conversely, the kitchen is very hot (above +30°C), this affects the operation of the thermostat and the viscosity of the oil in the compressor. In such conditions Bosch electronics may not read data correctly or physically not have time to cool the chambers.
Another important aspect is setting the temperature. If you accidentally set the minimum temperature ("Super Freeze" or "Maximum Cool" mode), the refrigerator will try to reach extremely low values, which is almost impossible in normal mode. Check the settings on the display or the position of the regulator inside the camera.
Do not forget about the “quiet zone” rule. After transportation or relocation, the refrigerator should stand upright without being turned on for 2 to 4 hours. This is necessary to allow oil to drain into the compressor. If you turn on the device right away, it may not work correctly or fail.
Malfunctions of the thermostat and temperature sensors
In mechanical models of refrigerators, Bosch is responsible for temperature control answers thermostat. This device opens the electrical circuit when the set temperature is reached inside. If the thermostat contacts are stuck in the closed position or the mechanism breaks down, the compressor will receive current constantly, working without interruption. You can determine if the thermostat is broken if you forcibly disconnect the refrigerator from the network, wait for defrosting, and then turn it on again - if the cycle repeats immediately and without stopping, the problem is most likely in it.
In modern models with a system No Frost and electronic control, the thermostat function is performed by air temperature sensors. There may be several of them: in the refrigerator, in the freezer, on the evaporator. If one of the sensors fails and transmits incorrect data (for example, it shows that it is warm in the chamber, although it is cold there), the control module will keep the compressor on.
Diagnostics of the sensors requires special equipment - a multimeter. The wizard checks the sensor resistance at different temperatures and compares the readings with reference values for a specific Bosch model. Replacing a sensor usually does not take much time and does not require complex repairs to the cooling system.
Sometimes the problem lies not in the sensor itself, but in oxidation of the contacts in the connector or a break in the wiring going to it. Vibration during compressor operation can cause the connection to be broken and the temperature signal will no longer be sent to the control board.
How to check the thermostat yourself?
For a mechanical thermostat, you can try to close its contacts directly (observing safety precautions!). If the compressor starts working during a short circuit, but does not work without a short circuit, the thermostat is faulty and requires replacement. However, this method is only suitable for experienced users.
Refrigerant leak and problems with the cooling system
One of the most serious reasons why Bosch refrigerator does not turn off is a freon (refrigerant) leak. In a working system, the refrigerant circulates in a closed circuit without being consumed or evaporated. However, if a microcrack forms in the tubes or evaporator, gas begins to escape. The pressure in the system drops, and the compressor, trying to compensate for the lack of cold, works at its limit, but still cannot reach the set temperature.
Signs of a freon leak can be:
- 🥶 Poor cooling or complete absence of cold in one or both chambers.
- 🔥 Hot side walls of the refrigerator (normally they should be warm, but not hot).
- 🧊 Uneven freezing of the evaporator (visible during defrosting).
- 🔊 Change in the sound of the compressor (may become quieter or appear gurgling).
It is impossible to independently find the leak and refill the refrigerator. This requires special equipment: a leak detector, a vacuum pump and a pressure gauge station. The technician will determine the location of the damage, seal it (or replace a section of the tube), replace the filter drier and charge the system with the exact amount of refrigerant specified in the technical documentation.
It is important to understand that trying to “just add freon” without finding and eliminating the leak is a temporary measure that will quickly lead to compressor failure. The oil that circulates along with freon may not return to the engine crankcase, which will cause it to jam.
System contamination and compressor malfunctions
Over time, changes can occur in the cooling system that are not visible to the eye, but affect operating efficiency. One of the problems is a clogged capillary tube or filter drier. This can happen due to moisture entering the system (for example, due to poor-quality previous filling) or due to oil breakdown products. Clogging interferes with the normal circulation of freon, creating excess pressure in front of the plug and a vacuum after it. The compressor begins to hum, trying to push through the plug, but cooling does not occur.
Another critical problem is wear of the compressor itself. compressor. If the motor has worked for a long time, its mechanical parts could wear out, and the windings could lose their properties. In this case, the compressor may hum, but not develop enough pressure to effectively circulate the refrigerant. It is also possible that the valves inside the motor are jammed.
☑️ Compressor diagnostics
Sometimes the compressor starting relay becomes the culprit for continuous operation. If it gets stuck or doesn't work properly, it may not open the start winding circuit, causing the compressor to continue running when it should have stopped. This is often accompanied by a characteristic hum and overheating of the motor.
To diagnose the compressor and relay, measuring current consumption is often required. If the current significantly exceeds the rated current indicated on the motor tag, this indicates an interturn short circuit or mechanical failure. In such cases, repair usually means replacing the compressor with a new one.
Comparative table of faults
To make it easier for you to navigate the possible causes, we have prepared a summary table. It will help you understand how serious the problem is and whether you can solve it yourself.
| Problem | Probability | Difficulty of repair | Signs |
|---|---|---|---|
| Loose fit doors | High | Low (independently) | Condensation, gap, warm rubber |
| Incorrect settings | Medium | Low (independently) | Super Freeze indicator is on, ice in the refrigerator compartment |
| Thermostat/sensor malfunction | Medium | Medium (need master) | The refrigerator freezes too much or does not freeze at all |
| Freon leakage | Medium | High (master only) | Hot sides, missing cold, long operation |
| Compressor wear | Low (for new models) | High (replacement unit) | Knock, hum, overheating, high current consumption |
As you can see From the table, many problems start with simple things. However, if you are not confident in your abilities, it is better not to take risks. Complex components, such as the compressor and refrigerant circulation system, require a professional approach and licensed tools.
Frequently asked questions and answers (FAQ)
Why a new Bosch refrigerator does it work without stopping on the first day?
When you turn it on for the first time or after a long defrosting, the refrigerator takes time to cool the entire internal volume and the products that you have loaded into it. During this period, the compressor can work without interruption for up to 12-24 hours. This is normal "first run" mode. If after a day the situation does not change and the temperature does not stabilize, then it is worth looking for a malfunction.
Could the enabled “Super Freeze” mode be the cause?
Yes, absolutely. Mode Super Freeze (or similar) forcibly keeps the compressor turned on for a long time to quickly freeze a large volume of food. In this mode, automatic compressor shutdown is blocked. Be sure to check if the corresponding indicator on the control panel is on and turn off this function if it is not needed.
What to do if the refrigerator is humming but not freezing?
This is a classic sign of a freon leak or a clogged capillary system. The compressor tries to pump, but there is little or no refrigerant in the system. You cannot operate the equipment in this condition - the compressor will burn out. It is necessary to call a technician for diagnostics and refueling.
How often should the refrigerator turn off normally?
Under normal conditions, the compressor operating cycle is approximately: 10-20 minutes of operation and 20-40 minutes of rest. The ratio may vary depending on the load of the chambers, the room temperature and the frequency of door opening. But there must be pauses in work.
Is it possible to operate the refrigerator if it does not turn off?
For a short time - yes, for example, until the technician arrives. But long-term operation in this mode (several days) will lead to overheating of the motor windings, destruction of the oil and other damage to the compressor. If you notice a problem, try to solve it as quickly as possible.