Intergas 29 Fault Code

What causes the Intergas 29 fault?

This fault occurs when the boiler's main control board detects a hardware failure in the electrical relay that manages the fuel supply. It means the system can no longer safely open or close the gas valve, so it shuts down as a protective measure to ensure gas cannot flow uncontrollably. The root cause is typically a component failure on the printed circuit board itself or a communication breakdown between the board and the gas valve.