Mains light Low

Potterton Mains light Fault Code

Also written as MAINSLIGHT — same fault.

The Potterton Mains light fault code means: this light simply shows that your boiler is receiving electrical power and is switched on.. It appears on 1 Potterton 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 that the mains electricity to the boiler is on.
Typical repair cost £0-60 (including labour)

DIY fix possible

Ensure the fused spur switch near the boiler is turned onCheck that your main consumer unit (fuse box) hasn't trippedIf the light is off but power is on, the internal fuse may have blown

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Potterton models that show the Mains light fault code

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

Source

Potterton Mains light fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026