BoilerFaultCodesIdeal Air pressure switch Fault Code
Also written as AIRPRESSURESWITCH — same fault.
The Ideal Air pressure switch fault code means: your boiler has stopped working because it cannot confirm that the fan is safely clearing waste gases from the system.. It appears on 2 Ideal models in our database.
Technical description: Air pressure switch fault detected by diagnostic feature.
What causes the Ideal Air pressure switch fault?
This fault occurs when the boiler's internal safety sensor fails to detect the correct flow of air required to safely carry away combustion fumes. The most common reasons include a buildup of debris in the fan or air tubes, a mechanical failure of the pressure sensor itself, or a blockage in the flue outside.
This issue can become more frequent during periods of high winds, which can create back-pressure in the flue and interfere with the air pressure sensor's readings.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Ideal models that show the Air pressure switch fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal Air pressure switch fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026