BoilerFaultCodes H1 High
Boiler Fault Code H1
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code H1 appears across 2 boiler brands and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your heat pump has stopped working because the internal control computers are unable to talk to each other. (As reported on Ideal HP290)
Pick your boiler brand for the H1 fix
Source
Information for the H1 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 7 July 2026