Err
Bosch
Generic System Error / Self-Test Failure
Display shows 'Err' or 'Error' without a number; cooker beeps and will not start.
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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
Firmware glitch, Unstable mains voltage, Loose internal connector, Early-stage control board failure
How to Fix / Troubleshooting
Safety first: Turn off and unplug the cooker before handling.
- Power reset: Unplug the unit for 10–15 minutes to allow capacitors to discharge. Plug back in and try again.
- Check power source: Plug the cooker directly into a wall outlet (no extension cord or power strip). Avoid outlets shared with high-load appliances.
- Inspect for moisture: If condensation or steam has entered the control panel, let the unit dry thoroughly before reuse.
- Internal check (advanced): Open the housing and verify that all ribbon cables and connectors between the display board and main PCB are firmly seated.
- Firmware/board replacement: If 'Err' persists, the control board or display module may need replacement by an authorized service center.
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Repair Difficulty
Medium
3/5
Required Part
Main Control Board
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