BoilerFaultCodesWhat the manual says
Manufacturer manualIgnition, pilot or flame proving fault.
What causes this fault?
This fault occurs when the boiler tries to start but fails to establish or maintain the small pilot flame needed to light the main burner. The most common reasons are a blocked pilot hole preventing gas flow or a worn-out sensor that can no longer detect the heat from the flame. Without confirmation that it is safe to stay lit, the boiler shuts down as a safety precaution.
This issue often appears in autumn when the boiler is first switched back on after a long summer break, as debris or dust can settle in the pilot assembly during periods of inactivity.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Avoid the next call-out bill
A cover plan would handle faults like Neon 4 NOT lit: no call-out fees, no surprise bills.
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