Have HVAC Questions? Ask an HVAC Expert for Answers
Hello, its an electronic problem, probably with the printed circuit board, and its motor speed control output, especially if your furnace is a variable speed blower type.
Its not something most home owners can repair themselves, let me know about your technical skills in that regard, or tell me which direction you are from the center of the nearest city...I will look for a well rated service outfit for you in that case.
Hello, it is entirely possible that the defective high *temperature cut out switch is sending a signal to the board and that based on that signal, the board is not sending power to the gas valve, and IS sending power to the blower speed control so that it runs and cools off what the board thinks is an over heated furnace.
However that does not account for the intermittent nature of the problem...