Keston Combi C40 Error Code F9

Hi Guys,

I have a Keston Combi C40 boiler, which is almost five years old. I am quite satisfied with its performance. I have not face any major problem up until now. However, from last few days, it is showing an F9 error code. I am unable to find the exact cause. Someone, please guide me.

Thanks in Advance

Jake

Hi Jake

F9 error code means “PCB Fault”. One of the most important part of any boiler is PCB as all the electronic components of the boiler communicate with the PCB. When PCB fails, all these components can malfunction. The best way is to call an engineer & run few important electrical tests by using a multimeter on the boiler. However, in the meantime you can look for the following things:

Leaks in the boiler
Fractures and cracks
Damaged or weal soldered joints