BoilerFaultCodes F.30 Medium
Boiler Fault Code F.30
Also written as F30 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.30 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 lost the signal from a temperature sensor that monitors the water flow between your heating system and the boiler, which will likely stop your heating from working correctly. (As reported on Viessmann Vitodens 100-W WB1A)
Pick your boiler brand for the F.30 fix
Source
Information for the F.30 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