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your furnace should have a flashing light on the control board count the number of blink through the door do not take blower door off it will reset the board and you will have to wait for it to do it again on the door somewhere there should be a list of numbers that will give you the definition of what the blinks mean.. a 90% furnace does not have a thermo couple it has a flame sensor my guess is the furnace is getting to hot check your filters
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