Boiler displays A14, no ignition, fan may run briefly then stop

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Blocked air pressure tubing, Faulty air pressure switch contacts, Condensate in pressure hoses, Fan not generating sufficient pressure

Safety: Isolate power before removing the casing. Do not blow into pressure switches or hoses connected to combustion chamber.

Check condensate drain: Ensure the condensate trap and pipe are not blocked, as backing-up condensate can affect pressure readings.
Reset the boiler: Try a reset to see if the switch proves correctly on the next start.
Technician inspection: A heating engineer should inspect and clear the pressure hoses, test the switch operation with a manometer, and replace the switch or fan if required.

Hard 4/5

Air Pressure Switch

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