BoilerFaultCodesYour boiler's small pilot light is on, but the main burner is failing to ignite, meaning your heating and hot water will not work.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Main burner fails to light, pilot burning. S.I.T. control solenoid valve failed.
What causes this fault?
This fault occurs when the gas valve receives a signal to open the main burner but fails to do so physically. The most common reason is a mechanical or electrical failure of the solenoid coil within the S.I.T. gas control valve, which prevents gas from reaching the main burner even though the pilot light is lit.
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 C.(3) — no call-out fees, no surprises.
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