How much does it cost to fix Worcester Bosch error code Group 2, 8 flashes?

Typical repair cost for the Worcester Bosch Group 2, 8 flashes fault is £150-300 including labour.

Group 2, 8 flashes Emergency

Worcester Bosch Group 2, 8 flashes Fault Code

Q: What does the Worcester Bosch Group 2, 8 flashes fault code mean?

Your boiler has detected an internal overheating issue or a blocked exhaust and has shut itself off to prevent damage or safety hazards.

Also written as GROUP28FLASHES — same fault.

The Worcester Bosch Group 2, 8 flashes fault code means: your boiler has detected an internal overheating issue or a blocked exhaust and has shut itself off to prevent damage or safety hazards.. It appears on 1 Worcester Bosch model in our database.

Technical description: MAX safety thermostat activated. Flue gas thermostat overheat or APS activated

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, 8 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, 8 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