Worcester boiler flashing an error? We’ve compiled fault codes and recommended fixes for every Greenstar model — Si Compact, CDi Classic, and the 25i / 30i / 32i range.
🔥 Worcester Greenstar i (25i / 30i / 32i)
5
- EA – Ignition failure (no flame detected)
- F7 – Flame detected before ignition
- FA – Flame detected after shutdown
- F1 – Low pressure / dry fire
- E9 – Overheat thermostat triggered
- E2 – Flow temperature sensor fault
- E5 – Flow temperature too high
- A1 – Pump dry run / airlock
- CE – Low system pressure
- C6 – Fan speed fault
- C7 – Fan not running
- C1 – Fan interruption
- C4 – Fan/control issue
- D4 – Rapid temp rise
- FD – Power interruption
- F0 – PCB / gas valve fault
- B1 – Code plug missing
- B7 – Burner control fault
- EF – Circulation fault
- D3 – External limiter
Worcester Greenstar Si Compact
- EA – Ignition failure
- F7 – Flame before ignition
- FA – Flame after shutdown
- F1 – Low pressure / circulation issue
- E9 – Overheat
- E2 – Flow sensor fault
- E5 – High flow temp
- A1 – Pump issue
- CE – Low pressure
- C6 – Fan speed fault
- C7 – Fan not running
- C1 – Fan stops mid-cycle
- C4 – Fan/control issue
- D4 – Rapid temp rise
- FD – Power interruption
- F0 – PCB fault
- B1 – Missing code plug
- B7 – Burner control fault
- EF – Circulation issue
- D5 – Condensate issue
🔥 Worcester Greenstar CDi Classic
- EA – Ignition failure
- F7 – Flame pre-ignition
- FA – Flame post shutdown
- F1 – Low pressure
- E9 – Overheat
- E2 – Flow sensor fault
- E5 – Over temp
- A1 – Pump dry run
- CE – Low pressure
- C6 – Fan fault
- C7 – Fan failure
- C1 – Fan interruption
- C4 – Fan/control fault
- D4 – Temp rise too fast
- FD – Power fault
- F0 – PCB fault
- B1 – Code plug
- B7 – Burner control
- EF – Circulation fault
- A7 – DHW sensor fault
🔥 Worcester Greenstar 2000
- EA – Ignition failure
- 227 – Flame loss during operation
- F1 – Low pressure
- E9 – Overheat
- E2 – Sensor fault
- E5 – High temp
- A1 – Pump fault
- CE – Low pressure
- C6 – Fan speed fault
- C7 – Fan failure
- C1 – Fan stops
- C4 – Fan/control issue
- D4 – Rapid temp increase
- FD – Power reset
- F0 – Control fault
- B1 – Code plug issue
- B7 – Burner fault
- EF – Circulation issue
- D5 – Condensate fault
- 9U – Control module fault
🔥 Worcester Greenstar 4000
7
- EA – Ignition failure
- 227 – Flame loss
- 228 – Flame detected incorrectly
- E9 – Overheat
- 219 – Safety thermostat
- E2 – Flow sensor fault
- E5 – High temp
- A1 – Pump issue
- CE – Low pressure
- C6 – Fan fault
- C7 – Fan not running
- C1 – Fan interruption
- C4 – Fan/control fault
- D4 – Rapid temp rise
- FD – Power issue
- F0 – PCB fault
- B7 – Burner control
- EF – Circulation issue
- D5 – Condensate fault
- 9A – Control module mismatch
🔥 Worcester Greenstar 8000 (Style / Life)
- EA – Ignition failure
- 227 – Flame loss
- 228 – False flame detection
- 229 – Flame instability
- E9 – Overheat
- 219 – Safety stat triggered
- E2 – Sensor fault
- E5 – High temperature
- A1 – Pump fault
- CE – Low pressure
- C6 – Fan speed fault
- C7 – Fan not running
- C1 – Fan interruption
- C4 – Fan/control issue
- D4 – Rapid temp rise
- FD – Power interruption
- F0 – PCB fault
- B7 – Burner control fault
- EF – Circulation fault
- 9U – Internal module fault