LED 1 Off, LED 2 Lit Low

Glow-worm LED 1 Off, LED 2 Lit Fault Code

Also written as LED1OFFLED2LIT — same fault.

The Glow-worm LED 1 Off, LED 2 Lit fault code means: your boiler is operating normally and is successfully heating your home or water.. It appears on 1 Glow-worm model in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Burner Lit

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 LED 1 Off, LED 2 Lit fault code

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

Source

Glow-worm LED 1 Off, LED 2 Lit 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