The Bosch refrigerator is very cold: 7 reasons and what to do

Has your refrigerator Bosch turned into a freezer? Do your food become covered with an icy crust and a thick layer of snow accumulates on the back wall? This is not just an inconvenience - excessive cooling leads to food spoilage, increased energy consumption and the risk of compressor failure. In 80% of cases, the problem can be solved on your own, without resorting to expensive repairs.

We will analyze all possible reasonswhy the refrigerator Bosch begins to “freeze” - from a banal error in the settings to serious malfunctions. You will learn how to correctly diagnose the problem, what manipulations are safe to perform yourself, and when it’s time to call a specialist. We will place special emphasis on models with a system NoFrost and two-compressor units, where the troubleshooting algorithm is different.

We warn you right away: if your refrigerator is under warranty, any independent intervention in the electronic components or freon system will automatically void the manufacturer's warranty. In this case, first contact the service center Bosch.

1. Check the basic temperature settings

Let's start with the simplest - perhaps the problem lies in incorrectly set parameters. Refrigerators Bosch factory settings are often lost after a power outage or power surge. Optimal temperature values:

• 🥶 Refrigerator compartment: from +2°C to +5°C (depending on load)
• ❄️ Freezer compartment: from -18°C to -20°C (for long-term storage)
• ⚠️ Critical point: If the refrigerator compartment shows below +1°C, the food will begin to freeze

How to check and change the settings:

1. On models with mechanical control (rotary knob), turn the knob one notch counterclockwise. Wait 6-8 hours - the temperature will not stabilize immediately.
2. On refrigerators with electronic display (series KIN86AF30R, KGN39XL30R) press Menu → Temperature → Refrigerator compartment and set the value to +3°C.
3. For dual-zone models (Bosch KAN92VI30R) configure the chambers separately: freezer -18°C, refrigerator +4°C.

Make sure the door is tightly closed|Check that the chamber is not overloaded with food|Disable the "Super Freeze" mode (if enabled)|Wait 24 hours after changing the settings to stabilize the temperature-->

If the problem persists after adjusting the settings, proceed to the next step. Please note: on hot days (above +30°C indoors) the refrigerator takes longer to cool, but the temperature should not fall below +1°C.

2. Diagnostics of the temperature sensor: when the electronics lie

In 30% of cases, excessive cooling is caused by a malfunction temperature sensor (thermistor). This small element transmits data about the current temperature to the control board. If the sensor “lies”, the refrigerator will work without stopping, trying to achieve a non-existent “norm”.

How to recognize a problem with the sensor:

• 🔍 The compressor works almost without pauses (normal cycle: 20-30 minutes of operation, 10-15 minutes of rest)
• 🌡️ The display shows a deliberately incorrect temperature (for example, +10°C with an ice crust on the food)
• 🔄 After manual shutdown, the refrigerator turns on again after 1-2 minutes

Simple test for models with a display:

1. Turn off the refrigerator from the network for 10 minutes.
2. Turn it back on and immediately go to Settings → Diagnostics → Sensor test (on some models the path: Menu → 0 → 1 → 3).
3. Compare the readings of the refrigerator compartment sensor with the actual temperature (measure thermometer). A difference of more than 3°C is a sign of a malfunction.

How to get to the sensor for visual inspection

In most models Bosch the refrigerator compartment sensor is located under the plastic panel on the back wall. Carefully pry up the panel with a flat screwdriver (it is held on by latches) and inspect the wires. sensor for oxidation or breaks. Do not disconnect the connectors unless necessary!

⚠️ Attention: If you do not have experience with a multimeter, do not try to test the sensor yourself. Incorrect connection can damage the control board. In this case, it is better to call a specialist.

3. The “brain” of the refrigerator is faulty

The control board (electronic module) is the “brain” of the refrigerator. If it malfunctions, the compressor may receive incorrect commands when operating in constant cooling mode. Typical signs of a board malfunction:

• 💻 The display flashes and shows errors (codes E22, E24 at Bosch indicate problems with sensors or the board)
• 🔄 The refrigerator spontaneously turns on/off modes (for example, it activates “Super Freeze” without a command)
• 🔌 After a power outage, the settings are lost

What you can do yourself:

1. Resetting the settings: Unplug the refrigerator for 15 minutes, then turn it on. This sometimes helps with software failures.
2. Checking contacts: Carefully remove the plug from the outlet and inspect it for melting. Check the power supply. cord for kinks.
3. Firmware update: For models with Wi-Fi (Bosch Serie 8), check for updates through the application Home Connect.

If after a reset the problem repeats and errors are displayed on the display, this is a direct signal that the board is faulty. Repairing an electronic module at home is almost impossible: soldering equipment and knowledge are required circuit design. The average cost of replacing a board at a service center is from 5,000 to 12,000 rubles (depending on the model).

Mechanical (knob regulator)|Electronic (display and buttons)|I don’t know how to determine-->

4. Clogged capillary tube: when freon does not circulate

The capillary tube is a thin channel through which the refrigerant (freon) enters the evaporator. If it becomes clogged with oil, moisture or freon decomposition products, the refrigerator begins to work incorrectly: the freezer may freeze, and the refrigerator may not cool enough (or vice versa).

Signs of a clogged capillary tube:

• ❄️ The freezer becomes covered. a thick layer of ice, and the refrigerator almost does not cool
• 🔊 The compressor hums non-stop, but the temperature does not stabilize
• 🌡️ The condenser (grid on the back wall) remains cold

What can be done:

1. Disconnect the refrigerator and defrost it for 12-24 hours. Sometimes the ice plug in the capillary melts on its own.
2. Check whether the freon-conducting tubes are kinked (this is important after transporting the refrigerator).
3. If the problem persists, the system needs to be cleaned or the capillary tube needs to be replaced. This is the job for you. professional with a vacuum pump and a freon bottle.

⚠️ Attention: Under no circumstances try to clean the capillary tube with wire or blow it with a compressor! This can lead to a rupture of the tube and leakage of freon. Freon is toxic and explosive when heated.

5. Malfunction of the thermostat (for models with mechanical control)

In refrigerators Bosch with a mechanical thermostat (for example, KGN33NW30R, KGV36NL30R) the thermostat is responsible for regulating the temperature - a device with a siphon tube filled with freon. If it breaks down, the compressor either does not turn on at all or works without stopping.

How to check the thermostat:

1. Unplug the refrigerator.
2. Remove the temperature control knob (it is simply put on the axis).
3. Under the handle you will see a plastic box with a tube - this is the thermostat. Carefully remove it without damaging the tube.
4. Ring the contacts with a multimeter in circuit test mode. At room temperature they should be closed. If there is no circuit, the thermostat is faulty.

The cost of a new thermostat for Bosch is from 1,200 to 2,500 rubles. Replacement does not require special tools, but it is important to select a part with the same markings. The most common models of thermostats for Bosch: K59-L1955, K59-L2382, K57-L2433.

6. Freon leak: when the refrigerator “loses its cool”

Freon is a refrigerant that circulates through the system and provides cooling. When it leaks (due to corrosion of tubes, mechanical damage or manufacturing defects), the refrigerator begins to work unstably: the freezer compartment may freeze, and the refrigerator compartment may not cool well, or vice versa.

Signs of a freon leak:

• 🛠️ The compressor works without stopping, but the temperature does not drop to the desired temperature marks
• 🔧 Oily stains are visible on the back wall of the refrigerator (freon comes out along with the oil)
• 🌡️ The condenser (grid at the back) remains at room temperature

What to do:

1. Turn off the refrigerator and inspect back wall. Look for rusty spots or swelling on the tubes.
2. If you find damage, do not turn on the refrigerator! Freon is under pressure, and the crack may increase.
3. Call a technician to vacuum systemfix the leak and refill with new freon. The average cost of the service is from 3,500 to 7,000 rubles.

⚠️ Attention: Freon R600a (used in modern refrigerators Bosch) is flammable! If leaked in a closed area, explosive concentrations may form. If you feel a strong chemical smell, ventilate the room and do not turn on electrical appliances until the leak is eliminated.

7. Problems with the NoFrost system: when the fan blows too hard

Refrigerators Bosch with the system NoFrost (KIN86AF30R, KAN92VI30R) are equipped with a fan that distributes cold air evenly. If the fan blades freeze or the motor wears out, the system begins to work incorrectly, which leads to freezing.

How to diagnose the problem:

• 🔊 Listen: if the fan hums louder than usual or makes a grinding noise, the bearings are worn out.
• ❄️ Open the freezer: if there is a thick layer of ice on the back wall and the fan does not spin, it is frozen.
• 🌬️ Check whether air is blowing from the ventilation holes in the refrigerator compartment (they are located on the back wall).

Solution:

1. Thaw the refrigerator for 24 hours. Do not use a hairdryer or hot water - a sudden change in temperature can damage the plastic.
2. After defrosting, check whether the fan blades rotate freely. If they cling to the ice, repeat defrosting.
3. If the fan does not spin even after defrosting, the motor needs to be replaced. Models Bosch are suitable for engines EBM W2E130-SW22-01 or W2E130-SW22-02.

FAQ: Frequently asked questions about freezing in Bosch refrigerators

❓ Why does a Bosch refrigerator freeze more at night?

This is normal! At night, the room temperature is usually lower, and the refrigerator works in a cycle: during the day it turns on more often (due to the opening of the door and warm air), and at night the compressor runs longer to compensate for the lack of “warm” periods. If the temperature difference between day and night does not exceed 2°C, there is nothing to worry about.

❓ Is it possible to use a refrigerator if it is very cold, but the food does not spoil?

No, this is fraught with consequences. Constant operation of the compressor without interruptions leads to its overheating and reduces its service life by 2-3 times. In addition, frozen foods lose their taste and beneficial properties (for example, proteins in meat are destroyed, and vegetables become watery after defrosting).

❓ How often do you need to defrost a Bosch refrigerator with NoFrost?

The manufacturer claims that the systems NoFrost do not require defrosting. However, in practice, it is recommended to carry out “preventative” defrosting once a year: turn off the refrigerator for 12 hours, wash the internal surfaces and check the drainage hole. This prevents ice from accumulating on the fan and evaporator.

❓ Why did the refrigerator become more freezing after moving?

Probable reasons:

1. It could have been damaged during transportation capillary pipeline (if the refrigerator was transported lying down). Freon could have accumulated in one place, disrupting the circulation.
2. The thermostat settings were lost due to shaking.
3. The compressor mounts were damaged, which led to increased vibration and incorrect operation.

Solution: Let the refrigerator stand for 6-8 hours in a vertical position (to stabilize the oil in the compressor), then check the settings and temperature. If the problem persists, call a specialist for diagnosis.

❓ What temperature should be in a Bosch refrigerator for storing medicines?

For most medicines (insulin, vaccines, some antibiotics) a temperature of +2°C to +8°C is required. In refrigerators Bosch the optimal place for storage is the middle shelf of the refrigerator compartment (the temperature is most stable there). Use a separate thermometer for control, since the built-in sensor can show the average value throughout the entire chamber.

Important: do not store medicines in the door - when opened, the temperature there fluctuates too much.