Pilot does not light High

Glow-worm Pilot does not light Fault Code

Also written as PILOTDOESNOTLIGHT — same fault.

The Glow-worm Pilot does not light fault code means: your boiler is failing to start up because the small ignition flame is not lighting correctly.. It appears on 2 Glow-worm models in our database.

Call an engineer soon

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

Technical description: Check for pilot jet blockage, incorrect electrode adjustment. Check continuity of pilot solenoid between EV1 and COM.

What causes the Glow-worm Pilot does not light fault?

This fault occurs when the boiler's gas valve opens, but the tiny pilot flame fails to ignite or be detected. The most common reasons are a buildup of soot or debris blocking the small pilot hole, or the ignition spark being too weak to catch the gas.

This issue is more frequent after summer periods of inactivity, as debris or spiders can settle in the pilot assembly while the boiler is not in use.

Typical repair cost £120-250 (including labour)

Engineer required

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

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Glow-worm models that show the Pilot does not light fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Glow-worm Pilot does not light fault code information on this page is sourced and cross-checked against the official Glow-worm service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026