Worcester Bosch Greenstar 4000 Combi 2931 – System fault boiler electronics / basic controller

2931

System fault boiler electronics / basic controller

Worcester Bosch Greenstar 4000 Combi

Category

Remedy

Illegal instruction.
▶ Restart appliance.
▶ If the fault persists following a reset, the burner control unit is faulty and must be replaced, (replace control unit).

This code also applies to:

Condens 7000 WP Greenstar 1000 Combi Greenstar 2000 Combi Greenstar 4000 System Greenstar 8000 F Combi Greenstar 8000 F Regular Greenstar 8000+ Style Greenstar 8000+

Source: Manufacturer manual (PDF)