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Old 09-29-2011, 10:55 AM   #1
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Can't Shut Off AC Unit


Ok, this is what I got. I just moved to a home in Florida with a split system; air handler inside, compressor outside. The unit was controlled by a non digital stat. One day, I was unable to control temp, switch to heat, turn off unit; basically nothing worked. I kill the breaker and purchase a Honeywell digital programmable sts.
After installing and turning on the power, the new stat still would not controll the unit.
I changed the compressor contactor to be on the safe side, but still the problem persisted.
A reply to a previous forum suggested the wiring in the stat might be the cause.
PLEASE NOTE: That even with the stat face removed, the ac still runs.

So I know this much, the ac cools, the unit heats, but I am unable to control it and turn it off without killing the breaker.

If you have any troubleshooting tips, please let me know. Thanks.

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Old 09-29-2011, 12:03 PM   #2
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Can't Shut Off AC Unit


Check and see where the control wires from the A/C unit that come back to the fan unit (furnace) are connected on the control board. one should be connected to "C" and the other should be connected to "Y" (either on the board along with the wire connected to "Y" on the t-stat, or could be joined with the wire from "Y" on the stat seperate from the control board).

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Old 09-29-2011, 02:40 PM   #3
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Can't Shut Off AC Unit


Will check and let you know thanks.
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Old 09-29-2011, 09:40 PM   #4
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Can't Shut Off AC Unit


Rhemius76,
Do you have a gas furnace or heat pump?

Last edited by Mr.HVAC; 09-29-2011 at 10:35 PM.
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