BoilerFaultCodes F.544 Medium
Boiler Fault Code F.544
Also written as F544 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.544 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 detected an issue with the valve that regulates the temperature of your heating water, so it has shut that valve to protect your system while keeping the water pump running. (As reported on Viessmann Vitodens 200-W B2HF System)
Pick your boiler brand for the F.544 fix
Source
Information for the F.544 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