BoilerFaultCodes.com
2 High Lockout

Your boiler is struggling to light its flame, meaning it cannot provide heating or hot water for your home.

Call an engineer soon

Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Ignition

What causes this fault?

This fault occurs when the boiler's control system attempts to start the combustion process but fails to detect a stable flame. It is often caused by a worn-out ignition lead that can no longer create a spark or a gas valve that is failing to release fuel into the burner. In some cases, it may simply be due to a temporary interruption in your property's gas supply.

Typical repair cost £100-£350 (including labour)

DIY fix possible

Check if other gas appliances, like a hob, are working to confirm gas supplyEnsure your gas meter has credit if you use a pre-payment meterPress the reset button or turn the control knob to 'OFF/RESET' and back to 'ON'

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Protect yourself from future repair bills

A boiler cover plan would cover faults like 2 — no call-out fees, no surprises.

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