222-F Medium
Boiler Fault Code 222-F
Also written as 222F — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 222-F appears across 1 boiler brand and 5 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 trapped air inside the system and is currently trying to clear it out to prevent the burner from overheating. (As reported on Viessmann A8)
Pick your boiler brand for the 222-F fix
Source
Information for the 222-F 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 27 April 2026