The situation when your Bosch refrigerator suddenly stops cooling food or freezing them to the required temperature always takes you by surprise. This can lead to stock spoilage and the need for urgent intervention. However, there is no need to panic ahead of time: often the problem lies in a banal violation of operating rules or simple settings that can be corrected yourself in a few minutes.
In more complex cases, the lack of cold signals technical malfunctions of the internal components of the unit. Modern German technology is equipped with sophisticated electronics and reliable, but vulnerable to voltage surges components. Understanding why the Bosch refrigerator does not freezewill help you make the right decision: call a technician or try to fix the problem on your own, saving your budget.
Primary diagnostics and checking settings
Before looking for breakdowns in "insides" of the device, it is necessary to exclude the human factor. Often, users accidentally reset the temperature settings or pack shelves tightly with products, blocking air circulation. In models with a system No Frost this is especially critical, since cold air must freely wash the chambers.
Check the control panel. If the “Super Freeze” or “Super Cool” indicator is lit on the display, the Super Freeze mode may have been turned on a long time ago and is now interfering with the normal operation of the thermostat. Also make sure that the door fits snugly against the cabinet. A loose fit leads to a constant supply of warm air, and the compressor simply does not have time to compensate for heat loss, working for wear.
⚠️ Attention: If you notice that the rubber seal on the door has lost elasticity or is torn, do not try to “revive” it with boiling water or a hairdryer. A deformed seal must be changed, otherwise the compressor will burn out from continuous operation.
Particular attention should be paid to the location of the products. In refrigerators Bosch with a side defrosting system, it is important not to block the back wall. If the products lie close to the evaporator, they may freeze, and the temperature sensor will read incorrect data, believing that the chamber is already cold enough and turning off the refrigeration.
Problems with the defrosting system (for No Frost models)
One of the most common reasons why Bosch refrigerator If it freezes poorly or stops doing so altogether, there is a failure in the automatic defrosting system. In units with the function No Frost frost constantly forms on the evaporator, which must periodically melt. The defrost timer, heating element (heating element) and defrost sensor are responsible for this process.
If one of these elements fails, the evaporator becomes overgrown with a “coat” of ice. This ice shell blocks the fans, and cold air simply does not enter the refrigerator compartment. There may be ice in the freezer compartment, and heat in the upper chamber. Diagnostics often requires removing the back panel of the freezer to visually inspect the amount of ice.
- 🧊 The defrost heating element is faulty: The heating element has burned out and does not melt the ice, which is why the evaporator is clogged.
- 🌡️ The defrost sensor has burned out: the system “does not see” that the ice has melted, or, conversely, does not starts the heating process on time.
- ⏱️ The defrost timer has broken: the mechanism is stuck in the cooling mode and never switches to defrosting.
To eliminate this problem, it is often necessary to completely defrost the refrigerator within a day. If, after turning on the unit, cold appears, but after a week or two it disappears again, it means that one of the elements of the defrost circuit requires replacement. Replacing the heating element yourself is possible, but requires care when disassembling the plastic panels.
Faults in the compressor and start relay
The heart of any refrigerator is the compressor. If Bosch unit it hums, but does not freeze, or, conversely, is silent and does not make any sounds, the problem may lie in the motor or its harness. The compressor is responsible for circulating the refrigerant throughout the system. If it does not start, there will be no cold anywhere.
A frequent cause of startup failure is the start relay. This is a small part that provides an impulse to start the engine. During power surges, the relay is often the first to burn out. This can be determined by a characteristic click when trying to turn it on, followed by silence or a buzzing sound that turns into a click after a few seconds (the protection is triggered).
A more serious situation is the failure of the compressor itself. If the motor windings burn out or an interturn breakdown occurs, the unit will not work. It is also possible for the compressor to “wedge” when mechanical parts get stuck inside the housing. In both cases, a professional replacement of the unit is required, since the procedure involves soldering tubes and refilling with freon.
| Symptom | Probable cause | Sound character | Actions |
|---|---|---|---|
| Silence, no reaction | Open circuit, relay, wiring | Absent | Checking socket, relay |
| Humming and clicking | Compressor wedge, relay | Buzzing for 5-10 seconds, clicking | Replacing the relay, motor diagnostics |
| Works without stopping | Freon leak, wear | Constant hum | Searching for leaks, refilling |
Refrigerant leak and capillary tube clogged
If you hear how Bosch refrigerator works (the compressor is humming), but there is no cold at all or it is very weak, there is a high probability of a leak freon or blockage. Freon is a working fluid that transfers heat. If its amount in the system decreases due to microcracks in the circuit, the cooling efficiency drops to zero.
Leaks often occur in the foamed part of the case or in the places where the condenser tubes are soldered (often this is the “warm” frame around the door). It is difficult to visually notice a leak, since the gas is colorless and odorless. An indirect sign may be swelling of the side wall of the refrigerator or the appearance of yellow rust spots on the rear grille.
Clogged capillary tube is a blockage of the narrow channel through which freon moves, with oil oxidation products or moisture. At the same time, the compressor tries to push gas, working with overload, but there is no circulation. Often in such cases, the filter-drier becomes covered with frost, and the condenser remains cold.
⚠️ Attention: Self-filling the refrigerator with freon is impossible without special equipment (vacuum pump, pressure gauge station). An attempt to simply “add gas” without eliminating the cause of the leak and evacuation of the system will lead to final breakdown of the compressor.
For repairs, you will need to call a technician who will perform a nitrogen test to find the leak, replace the filter drier and charge the system with the exact amount of refrigerant indicated on the nameplate Bosch.
Failures in the operation of the electronics and module control
Modern refrigerators Bosch, especially the series Classixx or VitaFresh, are controlled by complex electronic modules. The control board analyzes the temperature sensor readings and commands the compressor and fans. If the electronics are “glitchy,” the unit may behave inappropriately: for example, it may think that the chamber is -20°C and not turn on the cooling.
The reasons for electronics failures are trivial: power surges in the network, moisture ingress (for example, when washing the floor around the refrigerator or a leak from above) or simply aging of components. In such cases, the refrigerator may display error codes on the display (for example, E01, E06) or flash indicators.
Hidden Bosch error codes
Common codes: E01 - malfunction of the refrigerator compartment temperature sensor; E06 - problem with the freezer sensor; E11 - communication failure between modules. The exact decoding depends on the specific model.
Sometimes resetting the error helps by disconnecting the device from the network for 15-20 minutes. If after restarting the problem returns and the error code persists, most likely you will need to replace the sensor or resolder the elements on the control board. Diagnostics of the board requires skills in working with multi-MRT and knowledge of circuit design.
Influence of external factors and operating conditions
Do not forget that the operation of the refrigerator is influenced by the conditions in which it is located. If Bosch refrigerator is installed in an unheated room (on a balcony or in a garage) at a temperature below +5°C or above +35°C, its operation is disrupted. The oil in the compressor thickens in the cold, and in the heat heat transfer is disrupted.
Ventilation is also critically important. The back wall and side surfaces should have a gap of at least 5-7 cm from furniture and walls. If the refrigerator is built into a niche without proper ventilation, it will overheat and the thermostat will constantly keep it on, but it will not be able to freeze effectively.
- 🌡️ Temperature mode: operation at temperatures below +10°C can lead to oil freezing and compressor failure.
- ☀️ Direct sunlight: heating body, sunlight forces the unit to work at its limit.
- 🧹 Condenser contamination: a layer of dust and lint on the black grille at the back impairs heat transfer, reducing cooling efficiency.
Regular Cleaning the area around your refrigerator and controlling the room temperature will extend the life of your device. Do not install hot pots inside - this puts extreme stress on the system, which it may not be able to withstand.
☑️ Checking the operating conditions
Frequently asked questions and answers (FAQ)
Why does the Bosch refrigerator work, but does not freeze after defrosting?
If you defrosted the unit (kept it turned off for more than 12 hours), turned it on, it started working, but it was cold did not work, perhaps the capillary tube was clogged with moisture. The water that got into the system froze in a narrow place and blocked the flow of freon. You need to call a technician to purge the system.
Is it possible to use a Bosch refrigerator if it is tilted?
No, installation with a tilt is not allowed. This leads to improper flow of oil into the compressor and loose fitting of the doors. If the floor is uneven, be sure to use the adjusting feet to align the housing strictly level.
How can you tell if the compressor has burned out and not the relay?
If you hear a loud click when you turn it on, the hum lasts a couple of seconds, and then click again (protection) - most often the start relay is to blame. If the compressor hums smoothly and for a long time, but does not start, or the motor housing gets very hot, there is likely a wedge or an interturn short circuit in the windings of the compressor itself.
Why is it warm in the refrigerator compartment, but ice in the freezer?
This is a classic sign of a malfunction of the defrost system (No Frost) or a freon leak. If there is a freon leak, there is not enough of it for the entire circuit, so it condenses only at the beginning (in the freezer), and does not reach the refrigerator compartment. It is also possible that the air supply channel may freeze.
⚠️ Attention: Technical characteristics and designs of refrigerators may vary depending on the year of manufacture and the specific model. Before starting any disassembly work, check the official user manual for your Bosch modification.
Summarizing the above, we can say that why the Bosch refrigerator does not freezethere can be many reasons - from simple settings to complex technical breakdowns. Competent initial diagnostics will help you save time and money, and understanding the principles of operation will protect you from rash actions. Remember that regular maintenance and proper operation are the key to the long service life of your equipment.