AIR PRESSURE SWITCH N.O. High

Ariston AIR PRESSURE SWITCH N.O. Fault Code

Also written as AIRPRESSURESWITCHNO — same fault.

The Ariston AIR PRESSURE SWITCH N.O. fault code means: your boiler has stopped working because it cannot safely confirm that the fan is moving air and fumes through the system correctly.. It appears on 1 Ariston model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Indicator in TCS flow chart
Typical repair cost £120-280 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Ariston models that show the AIR PRESSURE SWITCH N.O. fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Ariston AIR PRESSURE SWITCH N.O. fault code information on this page is sourced and cross-checked against the official Ariston service / installation manuals for each affected model.

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