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Why dose my furnace blower alway blow in High speed? I oly runs for so long then quits & starts right afert that. I will show a code of 33 during the cycle & then it will show a code of 13 after it shuts down. What can I do to fix these problems?
 

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Roll out switches are the switches around the burner box, they must be manually reset by pushing the button on them. Limit switch has auto reset . Try resetting roll outs and cycle heat
 
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