BoilerFaultCodes 602 High
Boiler Fault Code 602
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 602 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 water circulation pump is struggling or has failed, meaning your heating and hot water will not work correctly. (As reported on Warmflow 70/90 Combi)
Pick your boiler brand for the 602 fix
Source
Information for the 602 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