Low neon light High

Glow-worm Low neon light Fault Code

Also written as LOWNEONLIGHT — same fault.

The Glow-worm Low neon light fault code means: your boiler is struggling to maintain a strong flame, which is why it keeps turning off or failing to heat up properly.. It appears on 1 Glow-worm model 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: Low flame indicator.

What causes the Glow-worm Low neon light fault?

This fault occurs when the boiler's internal sensor detects that the flame is too weak or unstable to safely heat the system. The most common reasons are a worn-out ignition electrode that can't spark correctly or a gas valve that isn't delivering the right amount of fuel to stay lit.

Typical repair cost £120-350 (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 Low neon light fault code

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

Source

Glow-worm Low neon 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