The Takagi PCB orchestrates ignition, modulation, and safety. Failure causes erratic behavior.
Symptoms suggesting PCB failure
- Multiple unrelated error codes
- Display garbled or blank
- Random restarts
- Modulation not happening
Diagnose by elimination
PCB failure is the diagnosis of last resort. Work through other possibilities first.
Replacement
Dealer-only. Cost: $400-800 OEM + $250-500 labor.
Warranty
5-year parts warranty includes PCB.
Bottom line
10+ year-old unit with PCB failure → replacement makes more sense. Inside warranty → replace.