BoilerFaultCodes A17 High
Boiler Fault Code A17
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code A17 appears across 2 boiler brands and 6 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has sensed that the water leaving the unit is getting too hot and has shut down as a safety precaution. (As reported on Vokera Condexa Pro)
Pick your boiler brand for the A17 fix
Source
Information for the A17 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