How much does it cost to fix Worcester Bosch error code Group 1, 4 flashes?

Typical repair cost for the Worcester Bosch Group 1, 4 flashes fault is £150-300 including labour.

Group 1, 4 flashes High

Worcester Bosch Group 1, 4 flashes Fault Code

Q: What does the Worcester Bosch Group 1, 4 flashes fault code mean?

Your boiler is failing to light the burner, meaning it cannot produce heat or hot water.

Also written as GROUP14FLASHES — same fault.

The Worcester Bosch Group 1, 4 flashes fault code means: your boiler is failing to light the burner, meaning it cannot produce heat or hot water.. It appears on 1 Worcester Bosch model in our database.

Technical description: First safety timing error/ignition timing error. The flame was not established during the first four seconds of the ignition period.

Typical repair cost £150-300 (including labour)

Engineer required

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

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Worcester Bosch models that show the Group 1, 4 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 1, 4 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