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My thermostat wires got pulled out of my outside unit and need to put them back but dont know where to start. The wires coming out of unit are blue and yellow and the norm thermostat wiring witch wires go where

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  • Robert Mar 26, 2011

    Ia this a heat pump or standard air conditioner



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Hello Cadbiad Jason,

I understand that your wires go to you outside unit (condensor) have been pulled out. To start with you have two thermostat wires look like telephone wire, and three power wires a ground usually bare or green, a white 120 and a black 120 volts.

I would be glad to help you with your problem. The first thing you need to do is shut off the disconnect box located by your unit as you do not want to get shocked by 220 volts.

1. Disconnect all power to the unit and turn off the thermostat.
2. Take the service panel off the side of the unit (1/4 or 5/16 screws)
3. The service panel you will notice a contactor this contactor will have two connections on the front and back for the white and black wire one side is for power from the disconnect the other side is the power going thru the unit to its parts. Make sure all of these connections are tight.
4. On the sides there are spade connectors one of your thermostat wires goes to one side and the other one goes to the other side (it does not matter which one goes where on a two wire non heat pump unit) you can wire nut each wire to the the ones if they are still usable. If not you will have to crimp new ends on your wires.
5. Replace the service panel
6. Turn the disconnect back on
7. Turn on your thermostat and make sure the unit turns on

If you have any further questions about this unit please fell free to post them to this thread and I will be happy to assist you. Thank you for choosing


Posted on Mar 26, 2011


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