Worcester Bosch Greenstar 4000 Combi fault 2910

What it means

Fault detected relating to the flue system, potentially involving blockages or condensate drainage issues.

Likely causes

1. Flue obstruction
2. Flue integrity failure
3. Water in sump
4. Siphon blockage
5. Incorrect gas type
6. Incorrect gas supply pressure
7. Damaged or blocked flue system
8. Incorrect gas/air ratio
9. Faulty gas valve
10. Misfiring ignition transformer
11. Power supply issue
12. Faulty electrodes or cable
13. Faulty external gas flow monitor (natural gas)
14. Faulty burner
15. Faulty seals around the burner
16. Faulty internal flue seals
17. Faulty case seals
18. Flue system integrity problem
19. Combustion circuit problem
20. Combustion fault
21. Damaged or insecure flue joints
22. Obstructed or damaged terminal/terminal guard
23. Damaged flue pipes or gaskets
24. Unauthorised modification of flue gas system
25. Leaking flue joints

Where to start

1. Check the flue for obstructions and remove any found
2. Check the flue integrity test
3. Check for water in the sump and check the siphon operation