Medium
208 on Worcester Bosch Greenstar 8000 Life System

Your boiler has been accidentally switched into a specific testing mode used by engineers to check emissions, which temporarily overrides normal heating and hot water operation.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

What the manual says

Manufacturer manual

Chimney sweep demand

From this model's manual
Verified against the Worcester Bosch Greenstar 8000 Life System installation & service manual, page 67.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Locate the menu button on your boiler's control panelNavigate to the service or maintenance settingsSelect the option to deactivate or exit the 'Chimney Sweep' or 'Service' mode

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