285 Medium

Worcester Bosch 285 Fault Code

The Worcester Bosch 285 fault code means: your boiler has detected that the water returning to it is much hotter than expected, suggesting heat isn't circulating properly through your radiators.. It appears on 4 Worcester Bosch models in our database.

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.

Technical description: Return temperature is too hot

What causes the Worcester Bosch 285 fault?

Overtemperature at return

Typical repair cost £120-250 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Worcester Bosch models that show the 285 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Worcester Bosch 285 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