Low
C. (1) on Potterton Kingfisher 2

Your boiler is not heating up because the temperature dial is turned down too low or switched to the off position.

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

Main burner fails to light, pilot burning - Boiler thermostat set to ‘OFF’ or low setting.

DIY fix possible

Locate the thermostat dial on the front of the boiler control panel.Turn the dial clockwise to a higher temperature setting.Ensure the external wall thermostat or programmer is also set to call for heat.

Find a Gas Safe engineer
Search the official register →

Related guides you might find useful

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 →

New boiler cost 2026

Realistic UK prices for a swap.

Read →