Orange 'Mains' light Low

Glow-worm Orange 'Mains' light Fault Code

Also written as ORANGEMAINSLIGHT — same fault.

The Glow-worm Orange 'Mains' light fault code means: your boiler is receiving electrical power, but if the light is off, there may be a problem with the electricity supply or the internal circuit board.. 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: Indicates if the mains power is illuminated/available inside the appliance.

What causes the Glow-worm Orange 'Mains' light fault?

This issue occurs when the electrical current fails to reach the boiler's control system, either due to a tripped switch in your home's fuse box or a blown fuse inside the appliance itself. It is often caused by a sudden power surge or a failing internal component that has caused the circuit to break for safety.

This fault is more frequent during storm season, as lightning strikes or local power grid fluctuations are more likely to blow the boiler's internal fuses.

Typical repair cost £90-250 (including labour)

DIY fix possible

Check that the boiler's power switch is turned onCheck your home’s main fuse box for a tripped circuit breakerEnsure the fused spur switch near the boiler is turned on

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Glow-worm models that show the Orange 'Mains' light fault code

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

Source

Glow-worm Orange 'Mains' 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