Heatline boiler, F5 error code

Hi All,

I have a Heatline boiler, and no hot water or central heating. Boiler is displaying error code F5. ANy idea what does it mean and how to fix it fast? Best if I can fix it myself! I have a new born at home, and it really isn’t a good time for a bad surprise like that.


Hi Jim

F5 error code means flue sensor fault, the simplest way is replacing it. Sometimes resetting the boiler helps- but only temporarily, so what I would do in your position is- first reset it and once boiler picks up the functionality call the local Gas Safe Engineer asking him to come and exchange flue sensor. He will come and fix the issue permanently.