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Gas Safe Register is the official gas registration body for the UK, Isle of Man and Guernsey, appointed by the relevant Health and Safety Authority for each area. By law all gas engineers must be on the Gas Safe Register.

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Ideal Boiler Fault & Status Codes

Should a fault develop with your boiler (or the system), your boiler will enter a safety lock-out mode, and fault code information will be generated as described below.

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Simply answer a few multiple choice questions about your existing boiler and we’ll give you a fixed price for a new boiler including all parts and installation[28]

Operation modes

Ideal offer a range of high efficiency boilers, with over 100 years innovation and industry experience you can be sure to reply on an ideal boiler. The modes at which your ideal boiler will operate at and what each operation mode means are listed below:


0 operation mode
The boiler is in standby mode awaiting for the central heating or hot water to be switched on

C operation mode
The central heating has been switched on but the boiler has already reached the desired temperature set.

D operation mode
The boiler has a call for hot water but the appliance has reached the desired temperature set on the boiler.

C operation mode, burner on
The boiler is operating in central heating mode.

D operation mode, burner on
The boiler is operating in hot water mode.

F operation mode, burner on
The boiler is operating in frost mode.

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Fault codes

If your ideal boiler is experiencing issues it will let you know by displaying a fault code on the front display. Take a look below at what each code means and what you can do to get your ideal boiler up and running again.


Fault code F6
Outside Sensor Failure Try to reset the appliance. If the boiler still fails to operate then please contact Ideal if the boiler is still under its manufacturing warranty. If not, contact us and we can arrange for a registered Gas safe engineer to assess the issues.

Fault code F7
Low Mains Voltage If you see this fault code please contact us to arrange for a qualified electrician to check the boiler or contact your electricity provider for advice.

Fault code F9
Unconfigured PCB Unconfigured printed circuit board. In such an instance please contact Ideal if your boiler is still under warranty. If it’s not then please contact us to arrange for a Gas Safe Registered Engineer to look at the boiler.

Fault code F0
No Water Flow Thermistor Reset the boiler - if it still fails to operate then please contact Ideal (if under warranty) or contact us directly and we can arrange for a registered Gas Safe engineer to examine the boilers fault.

Fault code L5
5 Boiler Resets in 15 minutes
  1. Turn power off and on at the fused spur
  2. If the boiler still fails to operate please contact Ideal, if your boiler is under warranty or alternatively if it is outside of the warranty contact us to arrange for someone to come and help you

Fault code L6
False Flame Lockout Try to reset the appliance - if the boiler fails to operate and you are still under warranty then please contact Ideal. If your manufacturer’s warranty has expired you can contact us to arrange for a Gas Safe registered engineer to assess the boiler faults.

Fault code C0
BCC Activation Fault Try to reset the appliance - if the boiler fails to operate and you are still under warranty then please contact Ideal. If your manufacturer’s warranty has expired you can contact us to arrange for a Gas Safe registered engineer to assess the boiler faults.

Fault code C2
BCC Fault Try to reset the appliance - if the boiler fails to operate and you are still under warranty then please contact Ideal. If your manufacturer’s warranty has expired you can contact us to arrange for a Gas Safe registered engineer to assess the boiler faults.

Fault code F1
Low Water Pressure Check that the system pressure is between 1 & 1.5bar on the pressure gauge. If it is and the boiler to operate please contact Ideal, if your boiler is under warranty or alternatively if it is outside of the warranty contact us to arrange for someone to come and help you.

Fault code L3
No Water Flow Check that the system pressure is between 1 & 1.5bar on the pressure gauge. If it is and the boiler to operate please contact Ideal, if your boiler is under warranty or alternatively if it is outside of the warranty contact us to arrange for someone to come and help you.

Fault code F2 and fault code L2
Flame Loss
  1. Check that the other gas appliances in the house are working to confirm a supply is present in the property.
  2. If the other appliances do not work or there are no other gas appliances, check the gas supply is on at the meter and/or the pre-payment meter has credit.
If there is a gas supply present but the boiler is not working then contact ideal (if under warranty) or if your warranty has expired contact us to arrange to have the boiler looked at

Fault code F3
Fan Fault First reset the boiler - if it fails to operate then please contact Ideal (if the boiler is under warranty) or if the warranty has expired contact us for help.

Fault code F4
Flow Thermistor First reset the boiler - if it fails to operate then please contact Ideal (if the boiler is under warranty) or if the warranty has expired contact us for help.

Fault code F5
Return Thermistor First try to reset the boiler. If the boiler fails to operate then please contact Ideal (if under warranty) or alternatively a Gas Safe Registered Engineer if outside of the warranty period. In IE contact a Registered Gas Installer (RGII).

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