Low
Light off on Worcester Bosch 35 RSF

Your boiler is currently sitting in standby mode because it hasn't received a signal from your thermostat or programmer to start heating.

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

No boiler demand

DIY fix possible

Check that your thermostat is turned up higher than the current room temperature.Ensure the central heating clock or programmer is set to 'On' or 'Auto'.Replace the batteries in your wall thermostat if the screen is blank or fading.

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 →