BoilerFaultCodesThe 6 most common faults
Your boiler's internal temperature sensor has stopped working correctly, causing the system to shut down for safety.
Locate the reset button on the control panelUse a small pin or paperclip to press the reset hole for a few secondsWait for the boiler to restart; if the error returns immediately, you will need a professional
Your boiler's burner has stopped firing for safety reasons, which means you currently have no heating or hot water.
Locate the reset button on the burner motor itself (usually behind the front casing) and press it once.Press the reset button on the main digital control panel.Check that you have fuel in your oil tank and that the isolation valve is open.
Your boiler's burner has shut itself down for safety because it failed to light or stay lit.
Check your oil tank level to ensure you haven't run out of fuel.Ensure the oil supply valve is fully open.Press the illuminated reset button on the burner once (do not press it more than twice).
Your boiler's burner has stopped working, meaning it cannot light the fuel to provide heating or hot water.
Check that you have enough heating oil in your storage tankEnsure the oil supply valve is fully openPress the red illuminated reset button on the burner once and wait for it to restart
Your boiler has switched itself off because the water inside became too hot, triggered by a safety sensor to protect the system.
Wait for the boiler to cool down completely (at least 20-30 minutes).Locate the manual reset button for the high-limit thermostat, usually found under a small black screw cap on the control panel.Unscrew the cap and press the reset button firmly; you should hear a click.Restart the boiler and check that your radiator valves are open and the system pressure is between 1 and 1.5 bar.
Your boiler has detected that one of its internal sensors is either broken or has a loose connection, preventing it from heating your water correctly.
Full guide for Combi panel 2 flashing green Sensor LEDson the Firebird Enviro
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
Avoid the next call-out bill
Monthly cover means no unexpected bills when your boiler breaks down.
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