Posted on Jul 28, 2009

Duo-therm fan only runs on low

I have a duo-therm self-contained air-conditioner/heat pump basement unit that the fan will not change speeds....how do I trouble shoot this

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ifixalot4her

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Posted on Aug 01, 2009

ifixalot4her

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Joined: Jun 23, 2008

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Useually a sticking fan relay in the controll board this is the closeest unit to a home based cenral air system and i would leave this one to the experts if you want to trouble shoot there is a detailed wiring diagram on the back side of the pc board cover on the fan and compessor unit it self there is a seperate relay for each speed on your unit make sure getting power to selected relay if not trace wiring and do continutity tests back to themostat

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