How much does it cost to fix Worcester Bosch error code Group 2, 9 flashes?

Typical repair cost for the Worcester Bosch Group 2, 9 flashes fault is £150-300 including labour.

Group 2, 9 flashes High

Worcester Bosch Group 2, 9 flashes Fault Code

Q: What does the Worcester Bosch Group 2, 9 flashes fault code mean?

Your boiler has detected that the water returning to it is too hot, causing it to shut down to prevent damage to its internal parts.

Also written as GROUP29FLASHES — same fault.

The Worcester Bosch Group 2, 9 flashes fault code means: your boiler has detected that the water returning to it is too hot, causing it to shut down to prevent damage to its internal parts.. It appears on 1 Worcester Bosch model in our database.

Technical description: Return temperature too high. Boiler overheat.

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, 9 flashes fault code

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

Greenstar CDi Compact Repair: £150-300

Source

Worcester Bosch Group 2, 9 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 27 April 2026