customer called about above furnace.would not come on.new install by another contractor. air worked in summer,but no heat at start of season.found fuse blown on board.found t-wire was pinched where it passed through the ceiling to apartment t-stat.replaced wire and t-stat.it ran for a week.now customer says fuse is blown again.I don't work much on fridgidare units.is there something I should be looking for,other than overt one. model fg6rk 096c-16b thanks taunch