The Bosch PCB is the unit's central computer. Failure causes erratic behavior and unusual code combinations.
Symptoms suggesting PCB failure
- Multiple unrelated error codes
- Display garbled or blank
- Random restarts
- Modulation not happening
Cost
- OEM PCB: $400-800
- Labor: $250-500
- Total: $650-1,300
Bottom line
10+ year-old unit with PCB failure → replacement makes more sense than repair. Inside warranty → replace PCB.