How much does it cost to fix boiler error code Group 1, 5 flashes?

Typical repair cost for the boiler Group 1, 5 flashes fault is £200-450 including labour.

Group 1, 5 flashes Emergency

Boiler Fault Code Group 1, 5 flashes

Also written as GROUP15FLASHES — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Group 1, 5 flashes appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected a potential internal gas leak or a sensor fault that prevents it from starting safely to protect your home. (As reported on Worcester Bosch Greenstar CDi Compact)

Pick your boiler brand for the Group 1, 5 flashes fix

Worcester Bosch Group 1, 5 flashes 1 model

Source

Information for the Group 1, 5 flashes fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026