Keston Combi C50 boiler error code F3

Hello Everyone,

My three years old Keston Combi C50 boiler is displaying a F3 error code from last five days. I have tried to figure out the reason behind it but not succeeded. Thus, I am here to get some help from the experts.

Anxiously waiting for your valuable suggestions


Hi Mike, according to the Keston combi boiler’s user manual an error code F3 deals with the fault in the fan. You have to restart the boiler. You can do it by following the boiler’s resetting guidelines. If your problem persists, do call an experienced Keston combi boiler engineer in order to handle the problem in a professional way.