BoilerFaultCodesThe 4 most common faults
01
E5 High DIY-safe
Your boiler's burner has stopped working and has gone into a safety lockout mode.
What to try first
Check that you have fuel in your oil tankEnsure the oil supply valves are fully openPress the illuminated reset button on the burner once and wait for it to restart
02
E1 High Engineer
Your boiler's internal temperature sensor has stopped sending the correct information, preventing the system from running safely.
Full guide for E103
E2 High Engineer
Your boiler has detected a problem with the sensor that monitors the temperature of the exhaust gases, causing the system to shut down for safety.
Full guide for E204
E3 High Engineer
Your boiler has detected a problem with the sensor that monitors the temperature of the exhaust gases, causing the system to shut down for safety.
Full guide for E3on the Firebird Enviro
Oil nozzlePhotocellOil pumpControl boxNTC Temperature SensorWiring Harness
Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.
Call a Gas Safe engineer if…
- You can smell gas or see signs of a leak
- The Firebird shows an Emergency or High severity code
- The boiler keeps locking out after repeated resets
- You've tried the DIY checks and the fault hasn't cleared
- There's visible water leaking from the boiler
- The flame is yellow or orange instead of blue