Question about Carrier 38CKC042 Air Conditioner

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Outside carrier unit doesn't come on when thermestat on cool

There is 240v to the contactor. there is 28v going to the circuit board inside the outdoor unit on three different colored wires.. there is not 28v on the contactor itself.

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  • tmondl May 19, 2009

    Thanks a lot. i hear the reversing valve engage, so it should work.

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  • 38 Answers

The board is bad, what you can do is splice into the common (blue) and Yellow t-stat wires and connect them directly into the contactor and hopefully the reversing valve engages, giving you cooling for the time being

Posted on May 18, 2009

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Randy2465@yahoo.comwhen you turn setting on thermostat to cool the thermostat clicks but outside unit and the inside fan neither come on?


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Open the control box and see if you have around 220-240V at the bottom of the contactor. The contactor is the switch looking thing in the bottom. If the unit is calling for air it should have a button in the middle that is pulled in. If you are not getting the volts at the contactor then you need to find the electrical problem.
If you have the correct voltage then look and see if the contactor is connected. The middle button should be pulled in. If you have one where you are unable to see the button, or it is not pulled in, Check the low voltage wiring. This is done by checking to see if there are 24V-28V on the side terminals of the contatcor. These terminals are located on the sides of the contactor. (some contactors have both sides of the 24V on one side.) Either way you should read 24-28V when checking across the two terminals. If you do not then you have a problem with the control wiring. (cut with weed eater, chewed by mouse etc.) I know the 24V coil is good because the inside unit is running. If the contactor is pulled in and the outdoor unit still does not run check and see if there is power at the other end of the contactor. (The end the switch breaks off)
If the switch is pulled in (or you read 24- 28V on the side of the contactor, and there is 240 V coming in on the line. Chances are you need to replace the contactor. Disconnect the power and pull one wire at a time of of the old contactor and install it on the new. After all of the wires are on the new one, remove the old contactor and throw it away. Screw the new contactor with all of the wires back onto the unit. restore power. Often times in our part of the country, there will be ants stuck in the points of the contactor. Just cleaning the contactor will buy more time.
Hope this helps.

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Remove the cover on the outside unit that covers the circuit board and contactor and capacitor. Then start the unit and set the thermostat so that the unit cuts off. Then go back to the outside unit and see if the contactor is still pulled in and the unit is running. Next open the breaker and see if the contactor drops out. If it doesn't your contactor could be stuck. Try to free it or replace it. If not the problem could be in the circuit board.

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Please take time to rate this fixya

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I have a carrier infinity system. On the thermostat it reads "sens error" where the outdoor temp is normally displayed. The inside unit is running but the outside unit is not. Any suggestions?


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