Ideal Boiler Fault Codes

• Turn your thermostat to its maximum position and check if a C appears on the boiler display. If the boiler fires and the radiators come on, this means the room thermostat wasn’t set higher than the room temperature.
• If the boiler still doesn’t fire, please contact us as this will require a visit from an engineer

• Rotate all knobs fully clockwise
• Turn the boiler off
• Turn the boiler back on and then press restart

• Reset the boiler
• If this does not fix the problem, please contact us quoting error code L4 as this will require a visit from an engineer.

• Please contact the installer

• The flow and return differential is wrong and may have been installed correctly / possible crossed pipes.
• Please contact the installer

• There difference between the water flow and return is too high (more than 50⁰)
• Turn the boiler off and bleed/let out the air of your radiators. Ensure the boiler pressure is still at 1 to 1.5 BAR and turn the boiler back on.
• Possible blockage, please contact us quoting error code FU (we won’t take offence) as this will require a visit from an engineer.

• Turn the boiler off and bleed/let out the air of your radiators. Ensure the boiler pressure is still at 1 to 1.5 BAR and turn the boiler back on.
• Your central heating pump may not be running. Gently touch it and if it’s working properly, there should be a gentle vibration and it should also be warm
• If you believe the central heating pump is NOT running, contact your installer.
• If you believe the central heating pump is running, please contact us quoting error code FA as this will require a visit from an engineer.

• Reset the boiler
• If this does not fix the problem, please contact us quoting error code C0 as this will require a visit from an engineer.

• Reset the boiler
• If this does not fix the problem, please contact us quoting error code C2 as this will require a visit from an engineer.

• Reset the boiler
• If this does not fix the problem, please contact us quoting error code F0 as this will require a visit from an engineer.

• Voltage to the boiler may be too low
• Contact us to inspect the electrics of your property

• Reset the boiler
• If this does not fix the problem, please contact us quoting error code F6 as this will require a visit from an engineer.

• Reset the boiler
• If this does not fix the problem, please contact us quoting error code F5 as this will require a visit from an engineer.

• Reset the boiler

• If this does not fix the problem, please contact us quoting error code F4 as this will require a visit from an engineer.

• Reset the boiler
• If this does not fix the problem, please contact us quoting error code F3 as this will require a visit from an engineer.

• Reset the boiler
• If your gas meter is pay-as-you-go, check there is credit available
• Check other gas powered items in your home, if these are also not working, you should contact a local gas engineer
• Check that the yellow gas isolation valve under the boiler hasn’t been turned off. If it is on, the handle/knob will be in pointing in the direction of the pipe.
• If the boiler is making a gurgling/garglign noise whilst trying to fire, please contact your installer as there may be a blockage
• If this does not fix the problem, call us quoting Error Code F2

• Water pressure is too low in the system and will require topping up to between 1 and 1.5 BAR 

• Reset the boiler
• If this does not fix the problem, please contact us quoting error code L6 as this will require a visit from an engineer.
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• The boiler has been reset too many times in 15 minutes.
• Turn the power to the boiler on and off again to reset

• Check that the water pressure to the boiler is at 1 to 1.5 BAR.
• Check that the yellow gas isolation valve under the boiler hasn’t been turned off. If it is on, the handle/knob will be in pointing in the direction of the pipe
• Turn the boiler off and bleed/let out the air of your radiatiors. Ensure the boiler pressur is still at 1 to 1.5 BAR and turn the boiler back on
• Press the reset button
• If this does not fix the problem, please contact us quoting error code L3

• Reset the boiler
• If your gas meter is pay-as-you-go, check there is credit available
• Check other gas powered items in your home, if these are also not working, you should contact a local gas engineer
• Check that the yellow gas isolation valve under the boiler hasn’t been turned off. If it is on, the handle/knob will be in pointing in the direction of the pipe.
• If the boiler is making a gurgling/gargling noise whilst trying to fire, please contact your installer as there may be a blockage
• If this does not fix the problem, call us quoting Error Code L2

Ensure that all radiator valves are open Check that the water pressure to the boiler is at 1 to 1.5 BAR. View our video on how to top up your boiler pressure here. Reset the boiler. If this does not fix the problem, please contact us.