BoilerFaultCodesYour boiler has detected that the internal fan or air pressure system is sticking in the 'on' position, preventing the ignition sequence from starting safely.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Air pressure switch made.
What causes this fault?
This fault occurs when the boiler's safety system detects that the air pressure switch is already closed before the fan has even started. It is usually caused by the internal switch being physically stuck or the small sensing tubes becoming blocked with debris or moisture. Because the boiler cannot confirm a fresh flow of air is starting from scratch, it stops the ignition process as a safety precaution.
This issue can be more frequent in autumn and winter, as increased moisture and condensation within the flue pipes can settle in the pressure tubes and cause the switch to malfunction.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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