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Author Topic: Basement A/C Hi/Low Fan  (Read 361 times)


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Basement A/C Hi/Low Fan
« on: November 18, 2017, 12:21:05 PM »
Our A/C fan switch only works on low; is this a simple fix? Anything to check at the control panel b4 pulling out the A/C unit? Something simple on the unit such as a component change?
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Re: Basement A/C Hi/Low Fan
« Reply #1 on: November 18, 2017, 12:47:39 PM »
Simple fix? No, unless you mean changing the thermostat. Those tiny switches/relays in the thermostat have a nasty habit of failing and the only solution is a new thermostat.. It may work ok on the Auto position though where the air conditioner itself controls the action.
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Re: Basement A/C Hi/Low Fan
« Reply #2 on: November 18, 2017, 06:24:00 PM »
^^ Probably what Stu said ^^ or the control board is bad. Go to my website in my signature and look at my ecobee upgrade, I have a truth table about what lead goes high (+12v) on a call for high fan.
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