BoilerFaultCodesThe 6 most common faults
Your boiler has lost all power and is currently completely turned off.
Check your home's fuse box or consumer unit to ensure the boiler circuit breaker has not tripped.Verify that the boiler's fused spur switch, usually located on the wall nearby, is switched to the on position.Ensure the boiler's internal on/off button or dial is set correctly.
Your boiler has stopped working because the water pressure inside the heating system has dropped too low.
Locate the filling loop (usually a silver braided hose with valves beneath the boiler).Open the valves slowly to allow mains water into the system until the gauge reads between 1.0 and 1.5 bar.Close the valves tightly and restart the boiler.
Your boiler has failed to start up or stay burning, so it has safely turned itself off to prevent a build-up of unburnt gas.
Full guide for RED lockout ledYour boiler has tried to start but could not get the fire going or keep it lit, so it has safely shut itself down.
Full guide for FLAME FAILURE LEDYour boiler is failing to ignite the flame it needs to heat your water or radiators due to a persistent ignition issue.
Full guide for Fault led (B) illuminatedYour boiler is struggling to receive the signal to start your central heating, possibly because it is not being told to turn on by your timer or thermostat.
Check that your heating timer or programmer is set to 'On' and the current time is correct.Ensure your room thermostat is turned up high enough to demand heat.Check your boiler's control dial is set to the heating position.
on the Ideal Boxer
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 Ideal 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