The fan/flue fault could flash for a number of reasons. Turn the selector switch all the way to the left to reset the boiler hold for about 15 secs. Then let go. When the boiler starts does the fan run, you'll hear the pump first then the fan should kick in. If not then you need to see if there's power to the fan. If there's no power there then it's probably a PCB fault. Also check flue looks ok (came apart in loft ?)
Could be PCB, Fan, Flue or Air pressure switch fault.
PJ, November 2007
