BoilerFaultCodes EC 256 High
Boiler Fault Code EC 256
Also written as EC256 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code EC 256 appears across 1 boiler brand and 9 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler's computer system has detected an internal electronic failure, meaning the burner cannot start and the system has shut down for safety. (As reported on Worcester Bosch Heatslave)
Pick your boiler brand for the EC 256 fix
Source
Information for the EC 256 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