Low
208 0 on Worcester Bosch 24 RSF

Your boiler is currently set to a manual testing mode used by engineers to check emissions, which overrides normal heating controls.

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

Chimney sweep demand

DIY fix possible

Locate the chimney sweep switch (icon showing a small brush or person cleaning a chimney).Ensure the switch is turned to the 'Off' or '0' position.Press the reset button if the code persists on the display.

Find a Gas Safe engineer
Search the official register →

Related fault codes

200View →

Related guides you might find useful

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 →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →