Boiler Fault Code 2F:1

Also written as 2F1 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code 2F:1 appears across 1 boiler brand and 6 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is currently performing a necessary internal air-clearing process and will resume normal operation automatically once it is finished. (As reported on Viessmann Vitodens 333)