E809
Bosch
Combined heating/fan mode configuration fault
Bosch oven shows E809 and fan-assisted grill or special modes fail
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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
Incorrect mode configuration in control board, Faulty selector logic on user interface, Software glitch after power event, Internal relay mapping fault
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker before accessing controls.
- Reset appliance: Power off for 15 minutes to allow the control to fully reset. Restore power and test the affected modes.
- Check mode selection: Verify that the correct cooking mode is selected and that the knob or touch icons respond properly.
- Update or reprogram: Some Bosch models support service-level configuration. If available, enter service mode (per service manual) and reset to factory settings.
- Board replacement: If E809 persists across all relevant modes, the main control board or user interface logic is likely faulty and should be replaced.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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