E20
Bosch
Main Brush Gearbox Failure
Robot vacuum reports E20; loud grinding or clicking noise from brush area before stopping.
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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
Stripped gears in brush drive, Foreign object in gearbox, Lack of lubrication, Worn brush drive belt (if used)
How to Fix / Troubleshooting
Safety first: Turn the robot OFF and flip it over.
- 1. Remove main brush: Take out the brush and inspect the drive end for damage or melted plastic.
- 2. Check brush drive socket: Look into the drive socket where the brush engages. Remove any debris or broken plastic pieces.
- 3. Spin drive by hand: If accessible, gently rotate the brush drive coupling. Grinding or roughness indicates internal gearbox damage.
- 4. Do not force operation: Running the robot with a damaged gearbox can cause further damage to the motor and mainboard.
- 5. Arrange service: The brush motor/gearbox assembly typically needs to be replaced as a unit by a technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Brush Motor Gearbox Assembly
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