Low
Neon l3 on Ideal Classic NF30–NF80

Your boiler is receiving electrical power and is currently sitting in standby mode waiting for a command to heat up.

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

Mains electricity ON

DIY fix possible

Check that your room thermostat is turned up high enough to trigger a heat demandEnsure your programmer or heating timer is set to 'ON'Check that the boiler temperature control knob is not turned to the 'OFF' position

Find a Gas Safe engineer
Search the official register →

Related fault codes

Neon L1View →Neon L2View →

Related guides you might find useful

Boiler won't turn on — 9-step checklist

Work through these before the call-out.

Read →

Yellow or orange flame — CO safety

Safety-critical — turn off, read this.

Read →

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →