Neon 1 High

Glow-worm Neon 1 Fault Code

Also written as NEON1 — same fault.

The Glow-worm Neon 1 fault code means: your boiler is failing to start because it is not detecting electricity or there is not enough water pressure inside the system to operate safely.. 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: Fault with main supply, PCB fuse or low water pressure switch.
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 Neon 1 fault code

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

Source

Glow-worm Neon 1 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 7 July 2026