BoilerFaultCodes E034 High
Boiler Fault Code E034
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E034 appears across 1 boiler brand and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is struggling to clear air from the system before it starts up, which is usually caused by a blockage in the flue pipe or a technical fault with the internal fan. (As reported on Vokera Synergy Combi)
Pick your boiler brand for the E034 fix
Source
Information for the E034 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