BoilerFaultCodesThe 6 most common faults
Your boiler's reset button is being pressed or held for too long, or there is an electronic glitch preventing the system from restarting properly.
Check if the reset button is physically stuck or jammed in the 'in' position.Turn the power to the boiler off at the fused spur switch for 30 seconds.Turn the power back on and wait to see if the flashing clears without pressing the button again.
Your boiler has stopped running because it failed to light the flame or detect that one was present.
Check your oil tank level to ensure you haven't run out of fuel.Inspect the oil supply valves to ensure they are fully open.Press the illuminated reset button once; if it fails again, do not continue trying and call a technician.
Your boiler has tried to light several times without success and has now shut itself down as a safety precaution.
Check your oil tank level to ensure you haven't run out of fuelEnsure any oil supply valves between the tank and boiler are fully openPress the burner reset button once (wait 2 minutes before trying again if it fails)
Your boiler's safety sensor is detecting a flame when there shouldn't be one, causing it to stop the ignition process for your safety.
Full guide for Burner reset light green/red alternate flash (0.5s)Your boiler has detected an issue with the electrical power supply coming from the mains, meaning it cannot run safely or consistently.
Full guide for Burner reset light orange steadyYour boiler has detected an unstable electrical supply, meaning the power entering the unit is either too high or too low for it to run safely.
Full guide for Burner reset light orange/green fast flash (0.2s)on the Worcester Bosch Danesmoor
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 Worcester Bosch 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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