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Old 03-22-2012, 01:08 PM   #1
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Wiring trouble


I have a Rheem heat pump unit that burned the 24VDC transformer out. I replaced it and burned the replacement up. I replaced it again and took a 3 amp breaker and placed it between the thermostat wires and the outside unit. I found that 1 of the wires that goes directly from the thermostat to the outside unit trips this breaker when I start the unit up. I tested by running new wiring and found that the wiring is okay. But I do not know what is causing the problem. Is it the thermostat or the board in the outside unit? Any help would be greatly appreciated. I have a 6 wire heat pump thermostat. Wire is Y that is giving me trouble.

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Old 03-22-2012, 06:07 PM   #2
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Wiring trouble


Most likely it is the contactor...........

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Old 03-23-2012, 11:05 PM   #3
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Wiring trouble


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Originally Posted by hvactech126 View Post
Most likely it is the contactor...........
i would have to agree sounds like you have a shunt contactor meaning your contactor is grounding out
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