BoilerFaultCodesYour boiler has stopped working because it cannot safely vent exhaust gases or the air-circulating fan has failed.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Fault on Fan or Flue
What causes this fault?
This fault occurs when the boiler's internal safety system detects that the fan isn't spinning at the right speed or the exhaust gases aren't being pushed out of the flue correctly. The most common reason is that the fan motor has worn out or a small internal tube has become blocked with debris, preventing the boiler from starting its ignition sequence safely.
This fault can be more common during periods of high winds, as strong gusts can occasionally create back-pressure in the flue that interferes with the air pressure sensor.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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A boiler cover plan would cover faults like 26 — no call-out fees, no surprises.
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