Tempstar Circa 1990-ish - HVAC - DIY Chatroom Home Improvement Forum

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Old 01-20-2009, 08:18 PM   #1
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Tempstar circa 1990-ish

I was hoping to get a little help from the masters of HVAC. I'm having trouble diagnosing a tempstar furnace. The blower runs all the time. Even without the t-stat being wired to it. It has intermittent spark ignition. I changed the board, but that didnt do anything. Would it be the limit switch? and if so can I jump it, to see if that is the problem. The wiring diagram shows a normally closed limit switch. Any help would be awesome.


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Old 01-20-2009, 09:14 PM   #2
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ICP and Carrier will run the fan continuously if the limit is open (to cool off the hot heat exchanger is the rational). You can test it with an ohmeter. I will never recommend jumping them as some fool may leave a jumper on for "temporary" heat and kill someone.


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Old 01-20-2009, 10:23 PM   #3
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if it were an open limit the furnace would not fire check the board ICP has a constant fan stake on be sure you wired to heat and cool
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