BoilerFaultCodesYour boiler is struggling to keep the flame steady and will keep trying to restart itself until it succeeds.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Flame stabilisation error – wait for the boiler ignition trial
What causes this fault?
This fault occurs when the boiler's internal computer detects an unstable flame that cannot be maintained safely during the ignition process. The most common reasons are a buildup of carbon on the sensing probes or a fluctuating gas supply that prevents the burner from staying lit. It essentially means the boiler is 'knocking at the door' but the flame isn't catching well enough to stay running.
DIY fix possible
Wait for the boiler to finish its automatic restart cyclesCheck that your gas meter has credit (if applicable)Ensure other gas appliances in your home are working correctly
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like 11-65 — no call-out fees, no surprises.
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Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
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