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There is a sequence these follow, Fan no spark? (usually can hear at cold air return or outside at exshaust) could be low battery (or poor power supply/ground), bad board, motor bad and wont run fast enough least likely is a bad sail switch. Can hear spark but wont light. BAd board, ignitor, or high tension lead, lpg presure to low, burner burnt out. Lights and quits, bad ignitor adjustment, bad board. And the last thing that we see all to often that would cause this, a bad high limit switch. Good luck |