What does F31 mean?
Main control board lost communication with motor control unit.
Common causes
- Loose connection between boards
- Failed MCU
- Failed main board
- Power surge
Diagnostic & testing steps
- 1. Check wire harness between main board and MCU
- 2. Unplug for 5 minutes to reset
- 3. Inspect connectors for corrosion
- 4. Replace MCU or main board
Tools required
- Multimeter
- Phillips screwdriver
OEM parts & part numbers
Motor Control Unit, Main Control Board
Part numbers: W10756692
Safety warning
⚠️ Disconnect power before servicing
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