BoilerFaultCodes F.100 High
Boiler Fault Code F.100
Also written as F100 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.100 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 has stopped working because of a communication failure between its internal electronic parts, meaning the main controls can no longer talk to each other. (As reported on Viessmann Vitodens 200-W B2HF System)
Pick your boiler brand for the F.100 fix
Source
Information for the F.100 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