Have you noticed that your refrigerator Bosch No Frost began to make more noise than usual or stopped cooling evenly? The reason may lie in a malfunction of the fan - a key element of the system No Frostresponsible for the circulation of cold air. But before you call a technician or buy spare parts, you need to understand exactly where this fan is located in your model.
In two-chamber refrigerators Bosch with technology No Frost the fan is usually hidden behind the back panel of the freezer or refrigerator compartment, but its location may vary depending on the series and year of manufacture. For example, in models Bosch KGE39XW2AR or KAN92VI30R the design differs from earlier versions KGN39XL20. In this article, we will analyze typical layout diagrams, show how to get to the fan without the risk of damaging the system, and explain what signs can be used to determine its malfunction.
Important: if you have never disassembled a refrigerator, it is better to first study the instructions for a specific model or watch video disassembly on YouTube (search by the exact name of your model). This will help to avoid mistakes when dismantling the panels.
The design of the No Frost system in Bosch refrigerators: where to look for the fan
Technology No Frost in refrigerators Bosch implies forced air circulation, which is provided by the fan. In two-chamber models, it can be located in one of three places:
- 🔹 Behind the rear wall of the freezer —the most common location. The fan blows on the evaporator, and cold air enters the refrigerator compartment through the channels.
- 🔹 In the upper part refrigerator compartment (less often) - typical for models with a system MultiAirflow, where the air is distributed through several channels.
- 🔹 In the technical compartment between the chambers —in some series (for example, Bosch KIN86AF30) the fan is hidden behind the decorative panel between the freezer and the refrigerator compartment.
To accurately determine the location, pay attention to noise: if the humming noise disappears when the freezer door is open, the fan is located there. The instructions for the model will also help - it usually contains a diagram indicating key components.
In most two-chamber models Bosch (for example, KGE39XW2AR, KGN39XI40) a fan is installed in the freezer compartment behind a plastic panel attached to the back wall. This panel covers the evaporator and the fan itself, which is mounted on a motor with blades. Access to it is blocked by a layer of insulation, so dismantling will require care.
Step-by-step instructions: how to get to the fan in the freezer
If you are sure that the fan is in the freezer (and in 80% of cases this is the case), follow these instructions. Before starting work unplug the refrigerator and wait until the ice on the evaporator melts (if any). This will take 1-2 hours.
Unplug the refrigerator
Empty the freezer of food
Wait 1-2 hours for the evaporator to defrost
Prepare a screwdriver (usually Phillips PH2)
Take a photo of the location of the wires before disconnecting -->
Next follow the algorithm:
Remove the shelves and drawers from the freezer. They are mounted on guides or simply removed.
Unscrew the back panel. It is held on by 4–6 screws (depending on the model). In some refrigerators (for example Bosch KAN92VI30R), the panel may be attached with plastic latches - they need to be carefully pressed out with a screwdriver.
Remove the panel and set it aside. Behind it you will see an evaporator (radiator with tubes) and a fan - a plastic impeller on the motor.
Disconnect the power connector of the fan. It is usually connected through a clip, which needs to be carefully squeezed and pulled out.
Now you can inspect the fan for damage. Pay attention to:
- 🌀 Blades —they should not be broken or deformed.
- 🔌 Wires —check for breaks or melting.
- 🔄 Bearing —twist the impeller by hand: if it rotates with difficulty or creaks, the motor needs to be replaced.
What to do if the panel cannot be removed?
If the back panel of the freezer does not budge after unscrewing all the screws, check:
1) Availability hidden latches on the sides (sometimes they are hidden under the seal).
2) The ability to move the panel up or down before removing (in some models it is fixed with grooves).
3) Have you mixed up the screws for the panels of the refrigerator and freezer compartments - they can be different sizes.
Signs of a fan malfunction: when it needs to be checked
The fan in the system No Frost does not work constantly, but is turned on by a signal from the temperature sensors. However, there are several obvious signs that something is wrong with it:
| Symptom | Probable cause | What to do |
|---|---|---|
| The refrigerator does not cool, but the freezer works | The fan does not rotate, cold air does not enter the refrigerator compartment | Check the fan power supply and the integrity of the blades |
| Constant hum or grinding noise | Wear of the motor bearing or ice/foreign objects on the blades | Defrost the refrigerator, clean the fan |
| The refrigerator makes a lot of noise, but cools normally | Imbalance of the blades or friction on the body | Align the position of the fan or replace impeller |
| Ice is growing on the back wall of the freezer | The fan does not work, the evaporator freezes up | Check the power circuit and the performance of the motor |
One of the most obvious signs — the refrigerator compartment has stopped cooling, and the freezer continues to freeze. This happens because cold air does not circulate from the freezer to the refrigerator. In this case, check:
- 🔌 Fan power supply —the connector may have come loose or the fuse has blown.
- 🌀 Rotation of the blades —if they are blocked by ice, the fan will not be able to spin.
- 🔊 Noise when turned on —if the motor hums, but the blades do not rotate, the problem is in the mechanical part.
Common causes of fan failure and how to avoid them
The fan in refrigerators Bosch No Frost does not break down as often as the compressor or thermostat, but there are several typical reasons:
Freezing of blades. If the defrosting system (defrost) does not work properly, ice builds up on the evaporator, which blocks the fan. This may happen due to:
- 🔥 Faulty defrost heater.
- 📉 Broken defrost sensor.
- ❄️ Clogged drainage hole (water does not drain, ice forms).
Wear of the motor bearing. Over time, the grease in the bearings dries out and the fan begins to creak or jam. This is an inevitable process, but it can be slowed down if:
- 🌀 Defrost the refrigerator regularly (at least once every 6 months).
- 🔧 Do not allow moisture to get on the motor.
Ingress of foreign objects. Sometimes pieces of packaging or food fall through the back panel and block the blades. This is one of the easiest causes to eliminate.
To extend the life of the fan, make sure that:
- 🍞 Do not store food close to the back wall of the freezer (this interferes with air circulation).
- ❄️ Do not allow a thick layer of ice to form on the evaporator.
- 🔌 Do not pull the power cord - this can damage the fan contacts.
How to check the fan for operation without dismantling
Before disassembling the refrigerator, you can carry out simple diagnostics:
Listen to the noise. In normal mode, the fan emits a uniform hum. If you hear creaks, clicks or a hum without rotation, the problem is obvious.
Check the reaction to opening the door. In most models Bosch the fan stops when the freezer door is open (for safety). Close the door and listen - if after 1-2 minutes the fan does not work, it may be broken.
Use a flashlight. Shine the light onto the back of the freezer through the grilles or slits. If you see that the blades do not rotate when the compressor is running, the fan is faulty.
For a more accurate check, you can use a multimeter:
Disconnect the fan power connector.
Switch the multimeter to resistance test mode (200 Ohm).
Touch the probes to the motor contacts. A working fan should show resistance within
50–150 Ohm. If the screen0(short circuit) or1(break), the motor is faulty.
Bosch models with a non-standard fan location
In most two-chamber refrigerators Bosch No Frost the fan is located in the freezer, but there are exceptions. For example:
- 🔹 Bosch KIN86AF30 — the fan is located in technical compartment between the chambers, access to it is through a removable panel at the junction of the freezer and refrigerator compartment.
- 🔹 Bosch KAN90VI20 —used here double ventilation system: one fan in the freezer, the second in the refrigerator compartment (in the upper part).
- 🔹 Bosch KGN39XL20 (old models) - the fan can be hidden behind a false panel in the upper part of the refrigerator compartment.
If your model is not included in this list, check:
- 📄 Operating instructions —there may be a diagram indicating the fan.
- 🔍 A sticker with model on the back wall of the refrigerator (needed to find technical documentation).
- 🌍 Bosch official website —in the support section they sometimes post diagrams for popular models.
How to find out the exact model of the refrigerator?
The model number Bosch is indicated on a metal plate, which is usually located:
- On the inner side wall of the refrigerator compartment (behind the shelf).
- On the back wall of the refrigerator (in the upper or lower corner).
- Under the plastic cover at the bottom of the front part (in some new models).
The number starts with letters KGN, KGE, KAN or KIN.
What to do if the fan is broken: repair or replacement
If diagnostics showed that the fan is faulty, you have two options:
Replacement of a motor with an impeller. This is the most reliable way. A new fan for Bosch No Frost can be purchased at service centers or at AliExpress (search by refrigerator model number). Average cost -
1,500–3,000 rubles.Bearing repair. If the problem is only a worn bearing, it can be lubricated or replaced. However, this is a temporary solution - after 6-12 months the problem will return.
To replace the fan:
Buy original spare part (the part number is usually indicated on the old fan or in the spare parts catalog Bosch).
Disconnect the old fan by unsoldering or snapping off the contacts (depending on the model).
Install a new fan, connect the power and check the rotation of the blades.
Assemble the refrigerator in the reverse order.
If you are not confident in your abilities, it is better to contact a service center. The average cost of replacing a fan in a workshop is 2,500–4,000 rubles (including spare parts).
⚠️ Attention: If after replacing the fan the refrigerator still does not cool, the problem may be in temperature sensor or control board. In this case, complex diagnostics are required.
FAQ: Frequently asked questions about the fan in Bosch No Frost refrigerators
Is it possible to operate the refrigerator if the fan does not work?
Technically yes, but only the freezer compartment the refrigerator compartment will begin to heat up, since cold air is not supplied. Long-term operation in this mode will lead to increased load on the compressor and its premature wear.
How often should the fan turn on in No Frost mode?
The fan works cyclically: it turns on for 5-10 minutes, then turns off for 10-20 minutes. The frequency depends on the set temperature and load (amount of products). If it works constantly or does not turn on at all, this is a sign of a malfunction.
Why does the fan make noise only at night?
This is due to changes in room temperature. At night, the air in the kitchen cools, and the refrigerator requires less effort to maintain the set mode. The fan can operate longer or at a different speed, which leads to increased noise. Also, the sounds become quieter at night. more noticeable.
Is it possible to lubricate the fan bearing yourself?
Yes, but this is a temporary solution. Use silicone grease for lubrication (for example, WD-40 Specialist). petroleum-based oils - they can damage the plastic. Lubricate the bearing, rotate the blades and check the noise. If the creaking does not disappear, the motor needs to be replaced.
Where to buy spare parts for a Bosch refrigerator?
Original spare parts can be ordered:
- 🔧 In authorized Bosch service centers.
- 🌍 On the websites AliExpress, eBay (search for parts by article number).
- 🏬 In stores of spare parts for household appliances (for example, 220-volt.ru, M Video).
Before purchasing, check the compatibility of the part with your refrigerator model.