BoilerFaultCodes E78-250 High
Boiler Fault Code E78-250
Also written as E78250 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E78-250 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 has detected an issue with its internal airflow system, which is preventing it from safely starting up to provide heat or hot water. (As reported on Potterton Kingfisher MF RSL)
Pick your boiler brand for the E78-250 fix
Source
Information for the E78-250 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