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Ideal Boiler Fault Codes

Although they tend to be reliable, Ideal boilers are no different to any other brand of boiler in that they can sometimes develop faults. When an Ideal boiler is in trouble, it will display a fault code to alert you that something is wrong and to help your boiler repair engineer quickly diagnose and assess the problem. Your boiler will also go into a lockout mode, which shuts down the boiler prior to displaying the fault code.

If your Ideal boiler has entered its safety lockout mode and is showing a fault code, you might be able to identify the issue using our table below. To find out the exact cause, you’ll need to contact a qualified and registered engineer.

Types of Ideal Boiler Fault Codes

FAULT CODEPOSSIBLE CAUSE
0BOILER IN STANDBY MODE AWAITING A CENTRAL HEATING CALL OR HOT WATER DEMAND
CBOILER OPERATING IN CENTRAL HEATING MODE OR BOILER HAS REACHED DESIRED SET TEMPERATURE AND HAS A CALL FOR CENTRAL HEATING
DBOILER IS OPERATING IN HOT WATER MODE OR BOILER HAS REACHED DESIRED SET TEMPERATURE AND HAS A CALL FOR HOT WATER
FBOILER IS OPERATING IN FROST MODE
FAREVERSED FLOW RETURN
FDNO WATER FLOW
FNFLAME LOSS
FUCHECK THE DIFFERENTIAL AND MAKE SURE ISOLATION VALVES ARE OPEN
LCTOO MANY RESTARTS – TURN POWER OFF AND ON
LNFLAME LOSS
C0BCC ACTIVATION FAULT
C2BCC FAULT
F1LOW WATER PRESSURE
F2FLAME LOSS
F3FAN FAULT
F4NO FLOW THERMISTOR
F5RETURN THERMISTOR
F6OUTSIDE SENSOR FAILURE
F7LOW MAINS VOLTAGE
F8UNCONFIGURED PCB
F9UNCONFIGURED PCB
L1NO WATER FLOW OR FLOW TEMPERATURE OVERHEAT
L2FLAME LOSS OR IGNITION LOCKOUT
L4NO FLOW THERMISTOR
L55 BOILER RESETS IN 15 MINUTES OR RETURN THERMISTOR FAULT
L6FALSE FLAME LOCKOUT
L8UNCONFIGURED PCB
L9UNCONFIGURED PCB

If you’re having problems with your Ideal boiler and can see any of the above fault codes on your boiler display, you can refer to our guide to Ideal Boiler Repairs to help determine the next course of action to take. But remember, unless you’re a qualified Gas Safe registered engineer, you should never attempt to carry out any repairs on your gas boiler.

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