How to check the fan in the Bosch refrigerator yourself: 5 steps from technicians

The fan in the refrigerator Bosch is the part that you don’t think about as long as it’s working properly. But as soon as the blades stop rotating or begin to creak, the consequences will not be long in coming: the temperature in the chambers rises, ice forms on the back wall, and the compressor runs non-stop. In models with a system NoFrost (for example, Bosch KGE39AW20R or KAN92VI30R), the fan is responsible for circulating cold air - its failure leads to failure of the entire cooling system.

The problem is that the symptoms of a fan failure are often confused with thermostat failures or freon leaks or compressor failure. This article will help you determine exactly whether the fan is to blame for your problems and what to do next—clean, repair, or replace. We will analyze 4 diagnostic methods (including testing with a multimeter), tell you where the fan is located in different models Bosch, and give a checklist for a quick check without tools.

Signs of a fan malfunction: when to sound the alarm

The first signal is that the refrigerator has stopped cooling evenly. In models with NoFrost (for example, Bosch KGN39XW20R) this manifests itself as follows: the freezer operates normally, but in the refrigerator compartment the temperature rises to +10...+15°C. In conventional refrigerators (for example Bosch KGV36VW20S), ice may appear on the back wall or excessive condensation.

Other symptoms:

• 🔊 Extraneous sounds: creaking, crackling or humming noise during operation (especially noticeable at night). Normally, the fan should produce uniform low-frequency noise.
• ❄️ Ice on evaporator (in models NoFrost): if the fan does not rotate, moisture is not removed, and a snowy "coat" forms on the "radiator" inside the rear wall.
• ⏱️ The compressor works without stopping, but the temperature does not drop. This is due to the fact that cold air does not circulate through the chambers.
• 💡 The light inside is on, but the refrigerator is not cooling. Sometimes this is a sign that the fan is blocked by ice or a foreign object.

If you notice at least one of these signs, do not rush to call a technician. First, check the fan yourself - in 60% of cases the problem is solved by cleaning or simple adjustment. But remember: in Bosch refrigerators with electronic control (for example, series VarioStyle), if the fan malfunctions, an error may appear on the display E24 or E25.

Where is the fan in the Bosch refrigerator: diagrams for different models

The location of the fan depends on the type of cooling system and model. In most refrigerators Bosch it is installed in the freezer, but there are nuances:

• 🔧 NoFrost (Full NoFrost): the fan is located behind the back panel of the freezer, next to the evaporator. Model example: Bosch KGE39XW20R.
• ❄️ LowFrost: the fan is located in the upper part of the freezer, under the lid. Example: Bosch KGN36XL20R.
• 🧊 Static models (without NoFrost): there may be no fan at all (natural cooling), or it is installed only in the freezer to blow the evaporator. Example: Bosch KGV36VW20S.

To get to the fan, you usually need to:

1. Disconnect the refrigerator from the mains.
2. Remove all food from the freezer.
3. Remove the back panel (in models NoFrost) or the top cover (in LowFrost). It is attached with latches or screws.
4. In some models (for example, Bosch KAN92VI30R), you will have to remove the shelf or ice box.

How to distinguish NoFrost from LowFrost in Bosch?

In refrigerators NoFrost (for example, series VarioStyle) there is no visible evaporator in the refrigerator compartment, and in the freezer - instead of a “snow coat” a thin layer of frost forms. In LowFrost the evaporator is visible, but it needs to be defrosted less often than in static models. For more details, see the instructions for your model - the system type is indicated there.

⚠️ Attention: Refrigerators Bosch with the function VitaFresh (freshness zone) may have an additional fan to cool the zero chamber. It is located separately and is checked in the same way as the main one.

Preparing for the test: what you will need and safety measures

Before climbing inside the refrigerator, prepare your tools and ensure safety:

• 🔌 Unplug the refrigerator and wait until the ice melts (if any). In models NoFrost this may take 1-2 hours.
• 🛠️ Tools:
  • Phillips and flathead screwdrivers (for removing the panel).
  • Multimeter (to check voltage and resistance).
  • Flashlight (lighting inside the chamber is usually weak).
  • A vacuum cleaner with a narrow attachment (for cleaning dust).
• 🧤 Gloves: sharp edges of the panel can hurt your hands, and in older models, rust accumulates on the evaporator.

If you are checking the fan in an electronically controlled refrigerator (for example, Bosch KAN92VI30R), pay attention to power connectors. They cannot be disconnected by force - only carefully by pulling the latch. Otherwise, you may damage the control board.

Unplugged the refrigerator from the outlet|Waited 1-2 hours for defrosting|Prepared screwdrivers and a multimeter|Put on gloves|Removed food from the freezer-->

⚠️ Attention: In refrigerators Bosch with an inverter compressor (series SilencePlus), the calibration may be reset when the power is turned off. After checking, let the refrigerator operate for 10-15 minutes in normal mode so that the system stabilizes.

Method 1: Visual inspection - what to look for and what to pay attention to

Start with an external inspection of the fan. To do this:

1. Remove the protective panel (as described above).
2. Inspect the fan blades:
   • 🔍 Damage: cracks, chips or deformation of the blades. Even a slight bend can cause imbalance and noise.
   • 🧊 Ice or frost: If the blades are frozen to the housing, the fan will not be able to rotate. This is a common problem in models NoFrost with a faulty defrost heater.
   • 🕷️ Foreign objects: pieces of food, packaging or even insects can block rotation.

Check fan motor:

• 🔌 Wires: should not be chafed or disconnected.
• 🧲 Magnetic rotor: if it is misaligned or jammed, the fan will not rotate.

If you find ice, do not try to pick it off with a knife or other sharp objects! Correct algorithm:

1. Turn off the refrigerator and leave the door open for 3-4 hours (or use a hair dryer to speed up the process).
2. After defrosting, wipe the blades and fan housing with a dry cloth.
3. Turn the blades by hand - they should rotate easily, without jamming.

Method 2: Checking fan rotation manually

If visually everything is in order, try starting the fan manually. To do this:

1. Make sure that the refrigerator is unplugged.
2. Gently rotate the fan blades with your finger:
   • ✅ The blades rotate easily, without squeaking - the mechanical part is in good condition.
   • ❌ The blades are jammed or they rotate jerkily - the problem is in the bearings or rotor.
   • 🔄 The blades rotate, but with effort - they may need lubrication (in older models) or replacement.

Connect the refrigerator to the network and listen:

• 🔊 If the fan does not start, but the compressor is working, the problem is in the electrical part (motor, board, wires).
• 🔄 If the fan starts, but stops after a few seconds - check thermistor (sensor temperature).

In models Bosch with electronic control (for example, KAN92VI30R), the fan may not start immediately after switching on. This is normal - it starts working only when the temperature in the chamber rises above the set one. To speed up the check, you can temporarily set the minimum temperature (for example, -24°C in the freezer).

Method 3: Testing with a multimeter - step-by-step instructions

If the mechanical part is in order, but the fan does not work, you need to check its electrical circuit. To do this, you will need a multimeter (even the simplest model will do).

Testing algorithm:

1. Disconnect the refrigerator from the mains and remove the access panel to the fan.
2. Disconnect the fan power connector. Usually this is a two-pin connector (sometimes with a lock).
3. Switch the multimeter to resistance testing mode (ohmmeter) and connect the probes to the motor contacts:
   • 🔢 Normal resistance: 200–500 Ohms (depending on the model). If it shows 0 (short circuit) or ∞ (open) - the motor is faulty.
   • 📉 Resistance below 100 Ohm —an interturn short circuit is possible.

Check the voltage at the fan power connector (with the refrigerator on):

• 🔌 It should be 12V or 24V (depending on the model). If there is no voltage, the problem is in the control board or wires.

In refrigerators Bosch with a display (for example, KGE39XW20R) if the fan malfunctions, an error may be displayed E24 or E25. This confirms that the problem is in the cooling system, and not in the compressor.

Multimeter readings	What does this mean	Actions
Resistance 200–500 Ohm	Motor is OK	Check the board or wires
Resistance 0 Ohm	Short circuit in the winding	Replacing the motor
Resistance ∞ (break)	Break in the motor winding	Replacing the motor
Voltage at connector 0V	No power from the board	Check the board, wires, fuses

⚠️ Attention: In refrigerators Bosch with a system Home Connect (smart control), when the fan is turned off, operation through the application may be blocked. After repair, you may need to reset the settings (press the button SuperCool for 10 seconds).

Method 4: Testing without a multimeter - alternative methods

If you do not have a multimeter, you can check the fan in other ways:

• 🔌 Direct connection to power supply:
  1. Disconnect the fan connector.
  2. Connect it directly to the source 12V (for example, the power supply from the router).
  3. If the fan starts working, the problem is in the board or wires of the refrigerator.

🔊 Listening with a stethoscope (or tube):

• Attach the stethoscope to the fan body while the refrigerator is running.
• If you hear a hum, but the blades do not rotate, the motor is jammed.
• If there is silence, there is no power or the motor is burned out.

🌡️ Checking sensors:

• In models NoFrost the fan may not work due to a faulty thermistor (temperature sensor).
• Try to heat the sensor with a hairdryer - if the fan starts, the sensor needs to be replaced.

In refrigerators Bosch with a function SuperCool the fan may not turn on in normal mode, but will start when this function is activated options. Try turning on SuperCool for 10-15 minutes and listen - if the fan starts working, the problem is in the settings or sensors.

What to do if the fan is faulty: repair or replacement

If diagnostics showed that the fan is broken, you have three options:

• 🔧 Repair:
  • If the problem is pollution - clean the blades and motor with a vacuum cleaner.
  • If the bearing is jammed - drop 1-2 drops machine oil (for example WD-40) into the gap between the shaft and the housing.
  • If frayed wire - insulate or replace it.
• 🔄 Replacing a fan motor:
  • The cost of a new motor for Bosch is from 1,500 to 3,500 rubles (depending on the model).
  • Item numbers of popular motors:
    • 00646050 — for most models NoFrost.
    • 00646051 —for refrigerators with LowFrost.
  • Replacement takes 20–30 minutes and does not require special skills.
• 📞 Call a technician:
  • If the problem is control board or sensors, it is better to contact the service.
  • The average cost of replacing a fan in the service is 2,500–4,000 rubles (with spare parts).

In models Bosch with a warranty (usually 2–5 years), repair or replacement of the fan is carried out free of charge. But the warranty does not cover breakdowns due to improper operation (for example, if the fan is blocked by ice due to rare defrosting).

FAQ: Frequently asked questions about the fan in the Bosch refrigerator

1. Is it possible to operate a Bosch refrigerator without a fan?

No, this will lead to overheating of the compressor and its failure. In models NoFrost without a fan, the freezer will work, but the refrigerator compartment will stop cooling.

2. How often should the fan be cleaned?

It is recommended to clean the fan of dust and ice every 6 months. In houses with animals or high humidity - once every 3 months.

3. Why does the fan run constantly without stopping?

This may be caused by:

• Malfunction thermistor (temperature sensor).
• Clogged condenser (radiator on the back wall of the refrigerator).
• Freon leakage (in this case the compressor will also work without stopping).

4. Is it possible to lubricate a Bosch refrigerator fan?

Yes, but only if it is a motor with plain bearings (in older models). Modern refrigerators are equipped with rolling bearings that do not require lubrication. Use only special lubricants for electric motors (for example, Liquid Moly).

5. How much does it cost to replace a fan in the service?

The cost depends on the model:

• Replacement of a fan motor - 1,500–2,500 rubles (excluding spare parts).
• Diagnostics + replacement - 3,000–5,000 rubles (with spare parts).
• In models with Home Connect the board may need to be re-flashed (+1,000–1,500 rubles).