Low
203 on Worcester Bosch Greenstar 28CDi

Your boiler is perfectly healthy and is simply waiting for you to turn on a tap or adjust your heating thermostat.

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

Boiler in standby, no heat energy demand

DIY fix possible

Check that your room thermostat or heating programmer is set to 'on'Ensure the hot water tap is fully open if you are testing for hot water

Find a Gas Safe engineer
Search the official register →

Related fault codes

204View →

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 →