BoilerFaultCodesWorcester Bosch 201 Fault Code
The Worcester Bosch 201 fault code means: your boiler is simply letting you know that it is currently busy heating up water for your taps or shower.. It appears on 15 Worcester Bosch models in our database.
Technical description: Boiler in hot water mode
What causes the Worcester Bosch 201 fault?
This is a normal operational message rather than a mechanical failure, occurring when the boiler senses a demand for hot water from a tap or shower. The internal sensors have identified that water is flowing through the heat exchanger, prompting the boiler to temporarily stop heating your radiators to focus all its energy on your hot water.
DIY fix possible
No action is required as this is an operational status message rather than a breakdown.Check that your hot water taps are fully turned off.Wait for the boiler to finish its current cycle, after which the code should disappear.
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Worcester Bosch models that show the 201 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 201 fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
- Worcester Bosch 24/28/35 CDi MkII manual (PDF)
- Worcester Bosch 26 CDi Xtra manual (PDF)
- Worcester Bosch Greenstar 1000 manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026