BoilerFaultCodes 25E High
Boiler Fault Code 25E
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 25E appears across 1 boiler brand and 7 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has detected that the water inside the main heating unit has frozen, which is preventing the system from operating to avoid damage. (As reported on Ravenheat HE 80/90 / 25-30s)
Pick your boiler brand for the 25E fix
Source
Information for the 25E 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