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    rjanp's Avatar
    rjanp Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Nov 14, 2011, 08:15 AM
    Tempstar furnace.
    My furnace starts up, I have it set for 70 or 72 and it stops producing heat at about 66. I shut it down and attempt to restart it and it gets to the electronic ignition spark but I don't get light off again? It has done this several times, it doesn't produce heat again until it cools off.
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Nov 14, 2011, 10:07 AM
    You might have a high limit safety switch opening up killing the power going to gas valve,and it doesn`t close back up till it cools down. This is caused by overheating or flames in unit burning outside the burners. This usually caused by a burned out heat exchanger and needs to be replaced,, this can be dangerious,, you need a hvac pro to check it out
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