What does the Glow-worm Neon 4 NOT lit fault code mean?

Your boiler has failed to light the pilot flame or cannot verify that the burner is safely lit, resulting in no heating or hot water.

How much does it cost to fix Glow-worm error code Neon 4 NOT lit?

Typical repair cost for the Glow-worm Neon 4 NOT lit fault is £120-280 including labour.

Glow-worm Neon 4 NOT lit Fault Code: What It Means & How to Fix It

Technical description

Ignition, pilot or flame proving fault.

What causes this fault?

This fault occurs when the boiler tries to start but fails to establish or maintain the small pilot flame needed to light the main burner. The most common reasons are a blocked pilot hole preventing gas flow or a worn-out sensor that can no longer detect the heat from the flame. Without confirmation that it is safe to stay lit, the boiler shuts down as a safety precaution.

This issue often appears in autumn when the boiler is first switched back on after a long summer break, as debris or dust can settle in the pilot assembly during periods of inactivity.

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Your boiler has failed to light the pilot flame or cannot verify that the burner is safely lit, resulting in no heating or hot water.

Technical description

What causes this fault?

Engineer required

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