Low
Mains light on Potterton Puma 100e

This light simply shows that your boiler is receiving electrical power and is switched on.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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.

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

Find a Gas Safe engineer
Search the official register →

Related guides you might find useful

Boiler won't turn on — 9-step checklist

Work through these before the call-out.

Read →

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →