How much does it cost to fix boiler error code Group 1, 2 flashes?

Typical repair cost for the boiler Group 1, 2 flashes fault is £150-350 including labour.

Group 1, 2 flashes High

Boiler Fault Code Group 1, 2 flashes

Also written as GROUP12FLASHES — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Group 1, 2 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 that the flame inside has unexpectedly gone out while it was trying to run. (As reported on Worcester Bosch Greenstar CDi Compact)

Pick your boiler brand for the Group 1, 2 flashes fix

Worcester Bosch Group 1, 2 flashes 1 model

Source

Information for the Group 1, 2 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