check the pressure make sure its above 0.5 bar on the gauge and not above 1.5 ish.. top pressure up by opening filler loop underneath base of boiler. in the manual it also says if flashing slowly it could be that it is swithced to the wrong summer/ winter setting, its on the "0" setting rather than the summ/win setting.
if flashing rapidly it means you need to get an engineer out.
kind regards john
john
December 2007