The Rinnai PC Board, Combi Large (805000156) is a genuine OEM replacement control board for i-Series Plus combination boilers. This printed circuit board serves as the central controller, processing inputs from sensors and thermistors to manage burner modulation, domestic hot water priority, pump operation, and safety shutdowns. Board failure can cause a wide range of faults, error codes, or complete system lockout. Replacing with this OEM board restores full system control and functionality.
- Genuine OEM Rinnai replacement control board
- Compatible with Rinnai i-Series Plus combination boilers
- Controls heating, DHW, and all safety protection functions
- Resolves error codes and system lockouts caused by board failure
- OEM replacement ensures correct programming and communication