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Old 12-29-08, 04:20 PM
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Join Date: Jul 2007
Location: Seattle, Wa
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Yes, the furnace you have is an upflow model and does not have the second limit switch.

I don't suppose there is a "fan" toggle switch on the furnace or on the thermostat that might have been turned on?

I would check the limit switch circuit with an AC voltmeter connected to the furnace ground or chassis. You should get 24 VAC on both side of the fusible link and limit switch.
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