E9
Bosch
Main Control Board Fault
E9 error appears and the cooker does not heat; may occur after a power surge or liquid spill.
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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
Shorted components on PCB due to moisture, Power surge damage to control board, Burnt relay contacts for heater, Corroded board connectors
How to Fix / Troubleshooting
Safety first: Disconnect from mains. Do not operate a cooker with suspected board damage.
- Drying after spill: If liquid has spilled into the control panel or lid area, unplug immediately and allow the unit to dry for at least 48 hours in a warm, dry environment before retrying.
- Visual inspection (advanced): Remove the housing to access the control board. Look for burnt spots, swollen capacitors, or corrosion around connectors.
- Check connectors: Reseat all multi-pin connectors to the board, ensuring a snug fit.
- Test operation: Reassemble and test with a simple program. If E9 persists, the board is likely defective.
- Board replacement: Replace the main PCB with the exact Bosch part number for your model. This repair involves mains wiring and should be done by a qualified technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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