Posted on: 13 March 2024
Welcome to our comprehensive guide on decoding fault codes for Ideal boilers!
If you’ve ever encountered mysterious error messages flashing on your boiler’s display panel, you’re not alone. Understanding these fault codes can save you time, money, and unnecessary stress.
At solv, we’re committed to ensuring your heating systems run smoothly. With our expertise and dedication, we offer a no-obligation free quote for repairs. Contact us – give us a call on 02890 451010 to schedule your appointment and let’s troubleshoot those boiler issues together!
Most Common Ideal Fault Codes:
Flashing Error Code DU: Divertor valve in mid-position for service
- Rotate all knobs fully clockwise
- Turn the boiler off
- Turn the boiler back on and then press restart
Flashing Error Code L4: Flow Thermistor
- Reset the boiler
- If this does not fix the problem, please contact us on 02890 451010 quoting error code L4 as this will require a visit from an engineer.
Flashing Error Code LC: 5 Boiler Reset in 15 Minutes
- The boiler has been reset too many times in 15 minutes.
- Turn the power to the boiler on and off again to reset
Flashing Error Code SE: Service Interval Timer –
- Please contact us on 02890 451010
Flashing Error Code FA Flow & Return Reversed –
- The flow and return differential is wrong and may have been installed correctly / possible crossed pipes.
- Please contact us on 02890 451010
Flashing Error Code FU: Flow & Return Differential more than 50⁰ –
- The 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 on 02890 451010 quoting error code FU as this will require a visit from an engineer.
View our video on how to top up your boiler pressure here.
Flashing Error Code FD: 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 us on 02890 451010.
- If you believe the central heating pump is running, please contact us on 02890 451010 quoting error code FA as this will require a visit from an engineer.
View our video on how to top up your boiler pressure here.
Flashing Error Code C0: BCC Activation Fault –
- Reset the boiler
- If this does not fix the problem, please contact us on 02890 451010 quoting error code C0 as this will require a visit from an engineer.
Flashing Error Code C2: BCC Chip –
- Reset the boiler
- If this does not fix the problem, please contact us on 02890 451010 quoting error code C2 as this will require a visit from an engineer.
Flashing Error Code F0: No Water Flow Thermistor –
- Reset the boiler
- If this does not fix the problem, please contact us on 02890 451010 quoting error code F0 as this will require a visit from an engineer.
Flashing Error Code F7: Low Mains Voltage –
- Voltage to the boiler may be too low
- Contact solv on 02890 451010 to inspect the electrics of your property
Flashing Error Code F6: Outside Sensor Fault –
- Reset the boiler
- If this does not fix the problem, please contact us on 02890 451010 quoting error code F6 as this will require a visit from an engineer.
Flashing Error Code F5: Return Thermistor –
- Reset the boiler
- If this does not fix the problem, please contact us on 02890 451010 quoting error code F5 as this will require a visit from an engineer.
Flashing Error Code F4: Flow Thermistor –
- Reset the boiler
- If this does not fix the problem, please contact us on 02890 451010 quoting error code F4 as this will require a visit from an engineer.
Flashing Error Code F3: Fan Fault –
- Reset the boiler
- If this does not fix the problem, please contact us on 02890 451010 quoting error code F3 as this will require a visit from an engineer.
Flashing Error Code F2: 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 us on 02890 451010
- 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 us on 02890 451010 quoting Error Code F2 as there may be a blockage
Flashing Error Code F1: Low Pressure –
- Water pressure is too low in the system and will require topping up to between 1 bar and 1.5 bar.
View our video on how to top up your boiler pressure here.
Flashing Error Code L6: False Flame Lockout –
- Reset the boiler
- If this does not fix the problem, please contact us on 02890 451010 quoting error code L6 as this will require a visit from an engineer.
- Flashing L AND 5 –
- Restart the boiler: Press and hold the restart button for a minimum of five seconds, then release. Do not try to do more than five restarts in 15 minutes or less because you will see an LC code.
- If this does not fix the problem, please call us on 02890 451010. Please quote Fault Code F5 because a Gas Safe registered engineer will want to visit the property.
Flashing Error Code L3: No Water Flow –
- 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 radiators. Ensure the boiler pressure is still between 1 bar to 1.5 bar and turn the boiler back on
- Press the reset button
- If this does not fix the problem, please contact us on 02890 451010 quoting error code L3
View our video on how to top up your boiler pressure here.
Flashing Error Code L2: Flame Loss or 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 us on 02890 451010
- 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 on 02890 451010 quoting Error Code L2
Flashing Error Code L1: Flow Temperature Overheat or No Water Flow –
Ensure that all radiator valves are open. Check that the water pressure to the boiler is between 1 bar 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 on 02890 451010.