Some good suggestions in this thread. Hopefully fixed for good now. If it does start acting up again try checking the port window located typically on bottom half of furnace. It will have a set pattern of blinking lights with a legend indicating type of fault. One green plus two red or 2 blue plus 3 orange or something similar to it. Will narrow the problem down quicker and you can tell them what light sequence you are seeing so repair guy will have correct parts on him and not have to make a return trip.
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