FAQs & Help
Information & frequently asked questions on our boilers, parts & controls.
- Flashing L AND 5
The boiler has been reset too many times in 15 minutes.
Turn the power to the boiler on and off again to reset
- Flashing L AND 6 False Flame Lockout
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.
- Flashing F AND 1 Low Pressure
Water pressure is too low in the system and will require topping up to between 1 and 1.5 BAR
View our video on how to top up your boiler pressure:
<iframe width="560" height="315" src="https://www.youtube.com/embed/13g6nRKmjjU" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>
- Flashing F AND 2 Flame Loss / Ignition Lockout
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 F2
- Flashing F AND 3 Fan Fault
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.
- Flashing F AND 4 Flow Thermistor
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.
- Flashing F AND 5 Return Thermistor
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.
- Flashing F AND 6 Outside Sensor Fault
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.
- Flashing F AND 7 Low Mains Volume
Voltage to the boiler may be too low
Contact a local electrician to inspect the electrics of your property
- Flashing F AND 0 No Water Flow Thermistor
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.
- Flashing C AND 2 BCC Chip
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.
- Flashing C AND 0 BCC Activation Fault
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.
- Flashing F AND D No Water Flow
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.
View our video on how to top up your boiler pressure:
<iframe width="560" height="315" src="https://www.youtube.com/embed/13g6nRKmjjU" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>
- Flashing F AND U Flow & Return Differential more than 50⁰
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.
View our video on how to top up your boiler pressure:
<iframe width="560" height="315" src="https://www.youtube.com/embed/13g6nRKmjjU" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>
- Flashing F AND A Flow & Return Reversed
The flow and return differential is wrong and may have been installed correctly / possible crossed pipes.
Please contact the installer