BoilerFaultCodes 502 High
Boiler Fault Code 502
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 502 appears across 1 boiler brand 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 thinks it sees a flame even though the gas should be turned off, so it has shut down as a safety precaution. (As reported on Ariston Alteas One)
Pick your boiler brand for the 502 fix
Source
Information for the 502 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