Ideal Heating has been providing reliable central heating for over 100 years, but no matter how good your boiler is, from time to time, it will display an error code to alert you that it is not functioning as well as it could.

Some error codes highlight problems that are easy to fix, while others need to be sorted out by a Gas Safe registered engineer.

Here are some of the most common fault codes that occur with Ideal boilers to help you determine how best to resolve them.

Common Ideal Logic Boiler Fault or Error Codes

Fault code System behaviour
0 The boiler is in standby mode awaiting either a central heating call or hot water demand
C The boiler has a call for central heating but the appliance has reached the desired temperature set on the boiler OR The boiler is operating in hot water mode
C0 Boiler chip card (BCC) activation fault
C2 Boiler chip card (BCC) fault
d The boiler is operating in hot water mode
D The boiler has a call for hot water but the appliance has reached the desired

temperature set on the boiler

F The boiler is operating in frost mode
F1 Low water pressure
F2 Flame loss
F3 Fan fault
F4 Flow thermistor fault
F5 Return thermistor fault
F6 Outside sensor failure
F7 Low mains voltage
F9 Unconfigured printed circuit board (PCB)
L1 Flow temperature overheat or no water flow
L2 Flame loss
L5 5 boiler resets in 15 minutes
L6 False flame lockout

Ideal Logic Max System / Logic plus system boiler fault or error codes

Fault code System Behaviour
L1 Flow temperature overheat lockout or no water flow lockout
L2 Ignition lockout
LC Turn power off and on
L6 False flame lockout
F1 Low water pressure
F2, FN or LN Flame loss
F3 Fan fault
L4 or F4 Control / no flow thermistor fault
L5 or F5 Return thermistor fault
F6 Outside sensor fault
F7 Low mains voltage. Contact electricity provider
F9, L9, F8 or L8 Printed circuit board (PCB) unconfigured or fault
FU Diff greater than 50c check isolation valves are open
No central heating Boiler problems? Book a boiler engineer now
No hot water
No display

Ideal Logic Max / Logic Plus regular boiler error codes

Fault code System Behaviour
L1 Flow temperature overheat lockout or no water flow lockout
L2 Ignition lockout
LC 5 restarts within 15 minutes
L6 False flame lockout
FA Flow return reversed
FD No water flow
F2 or FN or LN Flame loss
F3 Fan Fault
L4 or F4 Control / no flow thermistor fault
L5 or F5 Return thermistor fault
F6 Outside sensor fault
F7 Low mains voltage contact electricity provider
F9, L9, F8 or L8 Printed circuit board (PCB) unconfigured or fault
FU Diff greater than 50c check isolation valves are open
No central heating  

Boiler problems? Contact us now

 

No hot water
No display

Ideal logic max plus combi boiler error codes

Fault description System Behaviour
Overheat lockout Bleed radiators, refill system to 1.2 bar. Check that all radiator and boiler valves are open and reset boiler.
Ignition lockout Check gas appliances work and restart boiler
Too many restarts 5 starts within 15 mins. Turn power on and off.
Flame on before gas on False flame lockout.
Water pressure With boiler off and system cold fill system to 1.0 bar and bleed radiators if fault continues,Visit our Quick Quote page for a professional assessment and boiler repair estimate.
Too many resets 5 restarts within 15 minutes
Flame on before gas valve on Flame on before gas valve is on
Low mains voltage Less than 185v to boiler then check voltage at boiler mains in if mains voltage is okay, pump needs replacing
Low water pressure Low water pressure
Flow return reversed Check if the flow thermistor is correctly clipped to pipe. If not, replace flow

thermistor.

Printed circuit board (PCB) recently replaced Reset boiler
Pump rotor blocked Unblock pump
Flow temperature setpoint cannot be increased to 80c Check flow and return thermistors securely clamped to piper check flow and return thermistor
Overheat lockout error Boiler problems? Book an engineer.
Ignition lockout
Flame loss
Thermal fuse lockout
Outside sensor fault
Return thermistor
Fan fault
Printed circuit board (PCB) error
No domestic hot water working
Not hot water but central heating working
No water flow fault

If you’re dealing with Ideal Logic boiler problems, our fault code guide is a great resource. For additional insights into similar boiler issues, see our post on Worcester fault code E9.

CONTACT MAINTRACTS SERVICES

Contact Form