BoilerFaultCodesYour boiler has detected an issue with the fan or the system that removes exhaust fumes, which has caused it to shut down for safety.
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 fast enough or that exhaust fumes aren't being cleared safely through the flue. The most common reasons are a buildup of dirt on the fan blades, a blockage in the air pipes, or a failing motor that can no longer push the waste gases out of your home.
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.
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A boiler cover plan would cover faults like 22 — no call-out fees, no surprises.
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