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Owners of German household appliances are often faced with a situation where a reliable unit suddenly stops performing its functions. Bosch refrigerator famous for its durability, however, even the highest quality components are subject to natural wear or tear influence of external factors. The appearance of extraneous noise, ice or an increase in temperature inside the chambers signals the need for urgent diagnostics.
Timely identification of the problem allows you to avoid food damage and expensive major repairs. In most cases Bosch refrigerator malfunctions can be classified according to characteristic symptoms, which simplifies the search for the cause. Understanding the principles of operation of the main components will help you make the right decision: call a technician or try to fix the problem yourself.
Voltage drops in the network, incorrect installation or ignoring defrosting rules often become catalysts for serious breakdowns. Next, we will analyze in detail the main types of equipment failures.
Problems with starting and operating the compressor
One of the most common complaints is the situation when Bosch refrigerator does not turn on or makes a click and immediately goes silent. Often the culprit is the starting relay, which is responsible for supplying current to the motor windings. If this element burns out, the motor hums, but cannot start, which leads to heating of the housing and activation of the thermal protection.
A more serious problem is considered to be the failure of the compressor itself. In models with inverter control, diagnostics require special equipment, since the control board can block startup if a freon leak or a short circuit in the windings is detected. Replacing the compressor is a labor-intensive process that requires evacuation of the system and refilling the refrigerant.
⚠️ Warning: If you hear a loud hum followed by silence and the rear grille remains cold, do not try to turn the unit on repeatedly. This can finally finish off a motor that is still working.
To check the functionality of the electrical circuit, technicians use a multimeter. Continuity testing of the windings allows you to determine the presence of an interturn short circuit or break. If the resistance tends to infinity or, conversely, to zero, the engine requires replacement.
Temperature violation and freon leak
If The Bosch refrigerator does not freeze, but it works continuously, most likely there is a refrigerant leak. Freon circulates in a closed circuit, and a violation of its tightness leads to a drop in pressure. As a result, the evaporator does not cool to the required temperature, and the food begins to deteriorate.
Leaks often occur in the welds of the evaporator, which can corrode from the inside, or in the foamed part of the case. Signs of a lack of gas are:
- 🌡️ Poor cooling of the upper or lower chamber.
- 🔊 The compressor works non-stop, trying to gain temperature.
- 💧 The appearance of oil under the unit (lubricant comes out along with the gas).
- ❄️ Partial freezing of the evaporator while the engine is running.
Restoring the system requires finding the leak, sealing the hole and completely refilling it. It is impossible to perform this operation independently without a vacuum pump and a pressure gauge station. Attempts to simply add gas will not give long-term results.
Why can’t you just add freon?
Adding refrigerant without eliminating the leak and evacuating the system will lead to mixing of air and moisture with freon. This will cause the formation of acids that corrode the compressor from the inside, leading to its wedge in a short time.
Malfunctions of the No Frost and defrost system
In models with the system No Frost a frequent problem is the formation of a “fur coat” on the evaporator, which blocks air circulation. If you notice that Bosch refrigerator does not freeze wellbut it is humming as usual, check the defrost system. It consists of a heating element, a defrost sensor and a timer (or electronic module).
If the heating element or sensor fails, the ice does not melt, and after a while the air channels are completely blocked. Cold air stops flowing into the chambers, although the compressor continues to work. Visually, this can be seen by the ice on the back wall of the freezer.
Diagnostics begins with a continuity test of the heating element. If the spiral is intact, the sensor is checked, which should open the circuit when a certain temperature is reached. A common mistake is to replace only one element, while the problem may be in the control circuit.
☑️ Checking the defrost system
Extraneous noise and vibration during operation
Loud operation of the unit does not always mean a breakdown. Sometimes The Bosch refrigerator is humming due to incorrect installation. If the legs are not adjusted and the body is skewed, vibration from the compressor will be transmitted to the floor and walls, increasing the noise. Also, the source of sound can be the contact of the condenser tubes with the walls of the cabinet or the case.
However, there are also mechanical faults. Wear of the bearings in the compressor motor leads to a characteristic metallic clanging or hum that increases over time. In older models, the fan in the freezer may make noise if moisture or dirt has gotten into its bearing.
Particular attention should be paid to the sound of gurgling or liquid flowing. This is a normal sound of freon moving through the pipes, but if it becomes too loud and is accompanied by a whistle, there may be a blockage in the system or circulation is disrupted.
| Type of noise | Probable cause | Remedy |
|---|---|---|
| Monotonous hum | Incorrect installation, contact of pipes | Align legs, move pipes |
| Metal clanging | Wear of compressor bearings | Replacement compressor |
| Crackling or clicking | Malfunction of the starting relay | Replacing the starting relay |
| Fan whistling | Ice ingress or wear bushings | Defrosting or replacing the fan |
Continuous formation of ice and water
If water collects under the refrigerator or inside the chambers, and a thick layer of ice forms on the walls, the problem may lie in a clogged drainage hole. Moisture from melted snow does not go into the tray above the compressor, but flows out. You can clean the channel using a soft wire or a special brush.
Another reason is damage to the rubber seal on the door. If Bosch refrigerator seal it does not fit tightly, warm moist air enters inside. It condenses on the cold walls and freezes, forming massive ice build-ups. Over time, the rubber hardens, cracks or stretches.
⚠️ Attention: Do not use sharp objects (knives, screwdrivers) to chip ice. Damage to the evaporator will lead to an immediate leak of freon and costly repairs.
To check the door tightness, use a simple test with a sheet of paper. Clamp the sheet between the door and the body in different places. If the paper falls out without resistance, it means that the clamp is broken and the seal needs to be replaced or the hinges adjusted.
Failures in the electronic control module
Modern models Bosch equipped with sophisticated electronics that control all processes. If error codes (for example, E01, E06) light up on the display or the indicators blink in a certain sequence, this is a signal of a failure in the “brains” of the device. The reasons may be different: a power surge, oxidation of contacts, or failure of sensors.
Often the problem is solved by rebooting the system. It is necessary to disconnect the device from the network for 15-20 minutes, and then turn it on again. If the error repeats, it means the malfunction is hardware in nature. It may be necessary to reflash the module or replace burnt elements on the board.
Diagnostics of electronics requires deep knowledge of circuit design. Without experience, you can easily damage serviceable tracks or confuse the ratings of parts. In such cases, it is better to contact an authorized service center.
Frequent questions and answers (FAQ)
Why does a Bosch refrigerator make a loud click and turn off?
Most likely, the compressor starting relay has failed or the engine itself cannot start due to jamming. The click is the sound of the protection being activated. Motor diagnostics are required.
How to defrost a Bosch No Frost refrigerator?
Despite the No Frost system, preventative defrosting should be done every 6-12 months. Disconnect the appliance from the mains, open the doors and leave for 12-24 hours until the ice inside has completely melted.
What does the flashing Alarm indicator on a Bosch refrigerator mean?
The indicator signals that the temperature in the chamber has risen above the permissible level. Check that the door is closed tightly and that you have not loaded warm food. If it lights up constantly after cooling, the sensor is faulty or there is a freon leak.
Is it possible to replace the door seal yourself?
Yes, if you have new tires exactly for your model. The process requires care: you need to remove the old tape, degrease the groove and insert a new one, warming the corners with a hairdryer to straighten it.
Why is the back wall of the refrigerator hot?
This is normal. A condenser is located here, which releases the heat taken from the chambers. However, if the grill is red-hot or only heats up locally near the motor, this is a sign of overload or problems with freon.