Ideal Boiler Fault Codes

F1

Low water pressure - you can manually reset your boiler pressure

F2

Flame loss

F3

Fan fault 

F4 / L4

Flow thermistor 

F5 / L5

Return thermistor

F6

Outside sensor failure 

F7

Low mains voltage 

F9 / L9

Unconfigured PCB

L1

Flow temp too high or no water flow - you can manually set the flow temperature to the lowest setting if this doesn't work we recommend getting an engineer

L2

Ignition lockout - you can manually fix this with our frozen condensate guide here

L6

False flame lockout - reset your boiler and this should fix the issue

LC

5 boiler resets in 15 minutes - turn the electricity to your boiler off then on to fix the issue

FA

Negative differential flow/return rate 

FU

Flow/return differential > 50°C 

DU

Diverter valve in mid-position for service - turn all of the knobs clockwise, turn the boiler off and on, then click restart