HI first post here goes.House is currently unoccupied .Boiler was serviced and was working ok.Turned preheat off on hw as nobody was staying in the house.Anyway turned tap on a few weeks later no hot water.Tried heating same.Went to boiler noticed when heat was being asked for by either tap or radiators the 50 degree light would flash meaning fan/flue fault.The boiler is approx 3 years old and hasn't missed a beat till now.Looked at various posts regarding this fault and can't make my mind up what to look for.When heat is asked for the fan above spins up then after a few seconds the fault appears.
thanks
thanks