BoilerFaultCodes AIR PRESSURE SWITCH N.O. High
Boiler Fault Code AIR PRESSURE SWITCH N.O.
Also written as AIRPRESSURESWITCHNO — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code AIR PRESSURE SWITCH N.O. 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 stopped working because it cannot safely confirm that the fan is moving air and fumes through the system correctly. (As reported on Ariston Egis 24 MFFI)
Pick your boiler brand for the AIR PRESSURE SWITCH N.O. fix
Source
Information for the AIR PRESSURE SWITCH N.O. 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