Main burner does not light High

Glow-worm Main burner does not light Fault Code

Also written as MAINBURNERDOESNOTLIGHT — same fault.

The Glow-worm Main burner does not light fault code means: your boiler is failing to ignite the main gas burner, which means you will have no heating or hot water until it is repaired.. 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 continuity of main solenoid between EV2 and COM. If OK replace multi-functional control. If not OK replace main solenoid.

What causes the Glow-worm Main burner does not light fault?

This fault occurs when the boiler's internal components fail to open the gas supply to the main burner after the pilot light has been established. The most common reason is a failed electrical coil within the gas valve, which prevents it from physically pulling open to release fuel for the heating process.

Typical repair cost £180-350 (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 Main burner does not light fault code

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

Source

Glow-worm Main burner 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