Boiler Fault Code Air Flow Monitor

Also written as AIRFLOWMONITOR — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026

Fault code Air Flow Monitor appears across 2 boiler brands and 2 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 that it cannot breathe properly, meaning it is unable to safely vent exhaust gases, so it has turned itself off to prevent a safety hazard. (As reported on Potterton Performa 24 Eco HE)