Operating status
Worcester Bosch Boiler 208 — Operating Status
The documented boiler has a chimney-sweep demand. This is a service operating mode. Confirmed for the Greenstar 8000+ and 8000+ Style models covered by manual 6721891026 (2024/06), not every Worcester boiler. Record any accompanying letters or subcodes.
Quick answer
208: Chimney-sweep demand
Meaning
Chimney-sweep demand
First safe check
Record the full display and confirm the exact boiler model.
Seek advice if
Heating or hot water is unavailable when expected, another fault appears, or a service mode is active unexpectedly.
Who to call
Contact Worcester or a Gas Safe registered engineer if the boiler is not providing the expected heating or hot water, another warning appears, or a service mode is active unexpectedly.
This is an operating message on the documented models; the code alone does not establish a breakdown. Match the complete display and appliance model before interpreting an operating status.
What does this status mean?
The documented boiler has a chimney-sweep demand. This is a service operating mode.
The manual classifies this as an operating/status message, not a component-failure diagnosis.
Confirmed for the Greenstar 8000+ and 8000+ Style models covered by manual 6721891026 (2024/06), not every Worcester boiler. Record any accompanying letters or subcodes.
Why is this happening?
- The documented boiler has a chimney-sweep demand. This is a service operating mode.
What to check
- Record the full display and confirm the exact boiler model.
- Check the operating-code entry in the matching user manual; this status alone does not call for a repair or reset.
- If no engineer is carrying out a service test, ask Worcester or your engineer why the service mode is active. Do not enter installer menus.
Does this status need a repair?
Not indicated by this status aloneNo repair is indicated by this status alone on the documented model.
Safety boundary: Do not remove the boiler casing or work on gas, combustion, flue components or internal wiring.
What not to do
- Do not remove the boiler casing or work on gas, combustion, flue components or internal wiring.
- Do not order parts or repeatedly reset the boiler solely because this operating number is displayed.
Common misdiagnoses
- The manual classifies this as an operating/status message, not a component-failure diagnosis.
When to call a heating professional
Contact Worcester or a Gas Safe registered engineer if the boiler is not providing the expected heating or hot water, another warning appears, or a service mode is active unexpectedly.
Safety warning
Do not remove the boiler casing or work on gas, combustion, flue components or internal wiring.
Useful hub links
Other Worcester Bosch boiler codes
Worcester Bosch Boiler 281 — Meaning and Safe Advice
Pump stuck or running in air
Worcester Bosch Boiler 295 — Check the Model
Meaning unconfirmed; exact model evidence required
Worcester Bosch Boiler 297 — Check the Model
Meaning unconfirmed; exact model evidence required
Worcester Bosch Boiler CE — Code Meaning
Low pressure (207) or no pump-start pressure variation (266)
Relevant guide
Frequently asked questions
Does 208 prove that a part needs replacement?+
No. The cited manual records an operating status. A separate symptom or fault needs its own assessment.
Does this definition apply to every model?+
Confirmed for the Greenstar 8000+ and 8000+ Style models covered by manual 6721891026 (2024/06), not every Worcester boiler. Record any accompanying letters or subcodes.
Sources and review status
Model dependent · Last reviewed 21 September 2026
- Worcester Greenstar 8000+ / 8000+ Style manual 6721891026, pages 74–76
model manual · UK · checked 21 September 2026
The code definition and stated model/region scope. The manual classifies this as an operating/status message, not a component-failure diagnosis.