BoilerFaultCodesWorcester Bosch 208 0 Fault Code
Also written as 2080 — same fault.
The Worcester Bosch 208 0 fault code means: your boiler is currently in a manual testing mode used by engineers to check emissions, which means it is running at a fixed output rather than following your thermostat.. It appears on 10 Worcester Bosch models in our database.
Technical description: Chimney sweep demand
What causes the Worcester Bosch 208 0 fault?
This code appears when the 'chimney sweep' mode has been manually activated via the boiler's control panel. It is not an internal component failure, but rather a specific setting that forces the burner to run at a fixed speed for testing purposes. If you didn't turn this on yourself, it is likely an engineer left the mode active after completing a service or gas safety check.
DIY fix possible
Locate the 'Exit' or 'Back' button on the boiler control panel.Press and hold the button for a few seconds to cancel the test mode.The display should return to the standard temperature or status screen.
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Gas Safe Register →Worcester Bosch models that show the 208 0 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 208 0 fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026