Group 2, 10 flashes Emergency

Worcester Bosch Group 2, 10 flashes Fault Code

Also written as GROUP210FLASHES — same fault.

The Worcester Bosch Group 2, 10 flashes fault code means: your boiler has switched itself off because moving water inside the unit has become dangerously hot.. It appears on 1 Worcester Bosch model in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: Flow temperature too high - Supply sensor exceeded 110°C. Primary flow sensor overheated.
Typical repair cost £150-300 (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 Group 2, 10 flashes fault code

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

Source

Worcester Bosch Group 2, 10 flashes 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 7 July 2026