01 High

Boiler Fault Code 01

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 01 appears across 9 boiler brands and 64 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has failed to light or maintain a flame, which means it has locked itself out to prevent fuel from building up. (As reported on Vokera Linea 7)

Pick your boiler brand for the 01 fix

Alpha 01 23 models Biasi 01 1 model Chaffoteaux 01 7 models Glow-worm 01 3 models Ideal 01 1 model Ravenheat 01 8 models Remeha 01 3 models Saunier Duval 01 5 models Vokera 01 13 models

Source

Information for the 01 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