08 High

Boiler Fault Code 08

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 08 appears across 10 boiler brands and 61 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected an internal fault that is preventing it from operating, and it requires a professional inspection to identify the specific issue. (As reported on Vokera Mynute 28E / 35E)

Pick your boiler brand for the 08 fix

Alpha 08 22 models Baxi 08 2 models Chaffoteaux 08 5 models Glow-worm 08 4 models Remeha 08 3 models Saunier Duval 08 5 models Sime 08 2 models Unical 08 2 models Viessmann 08 4 models Vokera 08 12 models

Source

Information for the 08 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