BoilerFaultCodes F.19 High
Boiler Fault Code F.19
Also written as F19 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.19 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 inside your hot water tank, so it currently does not know when your water is hot enough and has stopped heating it. (As reported on Viessmann Vitodens 222-F B2TF)
Pick your boiler brand for the F.19 fix
Source
Information for the F.19 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