Bosch
Fan mechanical noise / bearing wear
Bosch oven makes loud rattling or grinding noises when the fan is running
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Worn convection fan motor bearings, Loose fan blade or mounting nut, Foreign object in fan housing, Loose cooling fan assembly
How to Fix / Troubleshooting
Safety first: Turn off power and allow the oven to cool before accessing fans.
- Identify noise source: Run the oven briefly and listen to determine if the noise comes from the rear (convection fan) or top (cooling fan).
- Inspect convection fan: Remove the inner rear panel inside the cavity to access the fan. Tighten the fan blade nut and remove any debris.
- Check cooling fan: Remove the top cover and ensure the cooling fan is securely mounted and free of obstructions.
- Replace motor: If the fan shaft has play or the motor is noisy when spun by hand, replace the corresponding fan motor.
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Repair Difficulty
Medium
3/5
Required Part
Convection Fan Motor
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