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 CODE | POSSIBLE CAUSE |
|---|---|
| 0 | BOILER IN STANDBY MODE AWAITING A CENTRAL HEATING CALL OR HOT WATER DEMAND |
| C | BOILER OPERATING IN CENTRAL HEATING MODE OR BOILER HAS REACHED DESIRED SET TEMPERATURE AND HAS A CALL FOR CENTRAL HEATING |
| D | BOILER IS OPERATING IN HOT WATER MODE OR BOILER HAS REACHED DESIRED SET TEMPERATURE AND HAS A CALL FOR HOT WATER |
| F | BOILER IS OPERATING IN FROST MODE |
| FA | REVERSED FLOW RETURN |
| FD | NO WATER FLOW |
| FN | FLAME LOSS |
| FU | CHECK THE DIFFERENTIAL AND MAKE SURE ISOLATION VALVES ARE OPEN |
| LC | TOO MANY RESTARTS – TURN POWER OFF AND ON |
| LN | FLAME LOSS |
| C0 | BCC ACTIVATION FAULT |
| C2 | BCC FAULT |
| F1 | LOW WATER PRESSURE |
| F2 | FLAME LOSS |
| F3 | FAN FAULT |
| F4 | NO FLOW THERMISTOR |
| F5 | RETURN THERMISTOR |
| F6 | OUTSIDE SENSOR FAILURE |
| F7 | LOW MAINS VOLTAGE |
| F8 | UNCONFIGURED PCB |
| F9 | UNCONFIGURED PCB |
| L1 | NO WATER FLOW OR FLOW TEMPERATURE OVERHEAT |
| L2 | FLAME LOSS OR IGNITION LOCKOUT |
| L4 | NO FLOW THERMISTOR |
| L5 | 5 BOILER RESETS IN 15 MINUTES OR RETURN THERMISTOR FAULT |
| L6 | FALSE FLAME LOCKOUT |
| L8 | UNCONFIGURED PCB |
| L9 | UNCONFIGURED 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.