What you find on this page:
Firebird Boiler Error Codes
| Fault | Possible Cause |
| E1 | Control thermistor fault |
| E2 | Flue thermistor fault |
| E3 | Flue thermistor fault |
| E5 | Burner fault (possibly burner lockout) |
| Thermostat at a high limit (cuts off) | Reset boiler |
Occasionally some things can go wrong, that’s why we’ve created our handy at-a-glance table of Firebird error codes and a guide to Common Firebird Problems and Repair.