BoilerFaultCodes F.342 High
Boiler Fault Code F.342
Also written as F342 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.342 appears across 2 boiler brands and 7 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 a communication issue with its internal burner control module, causing it to stop producing both heat and hot water as a safety precaution. (As reported on Viessmann Vitodens 200-W B2KF Combi)
Pick your boiler brand for the F.342 fix
Source
Information for the F.342 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