BoilerFaultCodes E01-505 High
Boiler Fault Code E01-505
Also written as E01505 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E01-505 appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is failing to light its pilot flame, meaning it cannot start the main burner to provide you with heating or hot water. (As reported on Ideal Mexico Super 100FF / 125FF)
Pick your boiler brand for the E01-505 fix
Source
Information for the E01-505 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