Fault Codes Don’t Have to be Scary

Seeing a fault code you don’t recognise on your boiler can be scary and the last thing you want this Halloween is your boiler sending shivers down your spine, but there’s no need to fear – we’re here to answer your questions and put an end to your fault code nightmares with this handy guide!

What does L5 mean?

This means there is a problem with the return. To reset this, turn the boiler off at the wall (fuse spur) for a couple of seconds then back on again.

What does it mean when the 'C' is displayed on the boiler screen?

'C' means the boiler has a central heating demand. This can be resolved by pressing reset on the front of the boiler and will not require turning the boiler off at the wall.

What does it mean when 'D' is displayed on the boiler screen?

'D' Informs you that the boiler is fired up for a hot water demand. Like ‘C’ this can be resolved by pressing reset on the front of the boiler and will not require turning the boiler off at the wall.

What does it mean when the '0' is displayed on the boiler screen?

'00' or ‘0’ on older Logics, informs you that the boiler is in standby and is not receiving a demand from either the hot water, or central heating. Try running a tap or turning the heating on and see if the status changes.

What does L2 mean?

If you have a pay as you go gas meter and accidentally run out of gas, you may see the error code L2 displayed on the boiler. If this happens, please top the gas up by going to your local store that supports gas top ups. Next turn the power off on the boiler and on again. Try to restart the boiler and this should clear the fault code. If this doesn’t work, it means that you need to purge the gas into the boiler by repeating, turning the boiler off and on and resetting the boiler every five minutes. This may take a while to purge the gas into the boiler.

What does L2 – Ignition Lockout mean?

If you have a L2 – Ignition Lockout on your boiler during the winter period, it is important to check that a frozen condensate pipe is not causing the problem. Click here for a video demonstration on how to safely defrost a frozen condensate pipe.

What does fault code FA flashing on a Logic Combi 35 mean?

This means there is an issue with the flow and return pipes are reversed. Although this is usually not the case on a combi boiler, if this occurs please check all isolation valves underneath the boiler are in the open position, all radiator valves are turned on full and the bypass is free flowing to see if this rectifies the issue.

If none of the checks and fixes above solve the problem, or if you discover that there is something wrong, you need to call a Gas Safe engineer to check over your boiler to find and fix any issues.

For more helpful tutorials on how to deal with fault codes click here.