BoilerFaultCodes E63 High
Boiler Fault Code E63
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E63 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 computer brain has encountered an internal software or hardware glitch and cannot function safely. (As reported on Johnson Starley C16d)
Pick your boiler brand for the E63 fix
Source
Information for the E63 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