02 High

Boiler Fault Code 02

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 02 appears across 8 boiler brands and 78 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has sensed it is getting too hot, usually because the water inside isn't moving around the system correctly. (As reported on Vokera Linea Max)

Pick your boiler brand for the 02 fix

Alpha 02 23 models Biasi 02 1 model Glow-worm 02 8 models Ravenheat 02 8 models Remeha 02 3 models Saunier Duval 02 10 models Viessmann 02 12 models Vokera 02 13 models

Source

Information for the 02 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