BoilerFaultCodes 9P High
Boiler Fault Code 9P
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 9P appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler's computer brain has suffered a serious internal electronic failure and can no longer communicate with the heating system. (As reported on Ideal Maximiser SE)
Pick your boiler brand for the 9P fix
Source
Information for the 9P fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026