BoilerFaultCodes.com
80 neon flashing High Lockout

Your boiler is starting up briefly but then failing to detect a flame, causing it to shut down for safety.

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: Burner extinguishes after 10 seconds. Go to section ‘I’.

What causes this fault?

This fault occurs when the boiler successfully lights the burner but fails to recognise that the flame is present, leading it to shut down for safety. The most common reason is a worn-out sensor electrode that can no longer send a signal to the control board, or a fault within the electronic circuitry itself. Essentially, the boiler is 'blind' to its own fire and turns the gas off to prevent an unsafe build-up.

Typical repair cost £100-£250 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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