BoilerFaultCodes.com
NEON6 High Lockout

Your boiler is failing to light or stay lit, meaning it cannot heat your home or water.

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: FLAME FAILURE

What causes this fault?

This fault occurs when the boiler attempts to start up but cannot detect a stable flame after several attempts. The most common reasons are a worn ignition electrode that can no longer spark correctly, or a faulty gas valve that isn't allowing fuel into the burner.

Typical repair cost £120-350 (including labour)

DIY fix possible

Check if your gas supply is active, for example by testing another gas appliance like a hob.Press the reset button once to see if the boiler restarts.Ensure the condensate pipe (the white plastic pipe outside) hasn't frozen in cold weather.

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Protect yourself from future repair bills

A boiler cover plan would cover faults like NEON6 — no call-out fees, no surprises.

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