BoilerFaultCodes F.542 Medium
Boiler Fault Code F.542
Also written as F542 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.542 appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has lost the connection to the temperature sensor that monitors the heat being sent to your radiators, which may cause your heating system to stop working correctly. (As reported on Viessmann Vitodens 100-W WB1A)
Pick your boiler brand for the F.542 fix
Source
Information for the F.542 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