A/C tripping breaker when turned ON

Old 04-20-16, 09:03 AM
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A/C tripping breaker when turned ON

Hello everyone,

Let me give a little back story. I purchased a home (2 months ago) for my grandfather who couldnt afford a home. The home was a great deal and was sold as is.

looking at the condition of the unit. The AC unit looks brand new (goodman gsx130301 - 13 seer AC, 2.5 Ton) All wires are hooked up except for the thermostat wires.

I connect the white wire from the thermo to blue common on the AC/ Red wire from the thermo to the yellow on the AC

When i flip the breaker on. It trips instantly. One time the break sparked.

Did i connect the thermo wires wrong?
Maybe they never put freon on this new unit?

My troubleshooting:

Thermo was set to OFF - same issue
wires are tighten on the breaker and the AC unit.

I would love some help as I do not have money to pay anyone. Using my money now to help my grandpa
Old 04-20-16, 09:20 AM
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Welcome to the forums.

We need information as to what you are working on. A make and model are ideal. Pictures are always helpful. http://www.doityourself.com/forum/el...-pictures.html

It's unusual to only find two wires on a thermostat. Is this a manufactured or mobile home unit..... possibly a Coleman A/C ?

What size (amps) is the breaker that is tripping ?
Old 04-20-16, 09:31 AM
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I will get the amps here in a few hours.

Sorry for any confusion the thermo has 4 wires (attached the image). I followed those wires and they go to the new furnace I had installed (furnace works). From the furnace 2 wires go out to the AC unit. Name:  IMG_1107.jpg
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Make/model of the AC unit is goodman gsx130301

-Residential Home
Old 04-20-16, 05:27 PM
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Red and white are not from the thermostat. They should come from the furnace.

(White from the stat is heat not common)

I would verify that the red wire connects to Y along with the yellow wire from the stat.

I would also verify that white connects to furnace C.

That said, it is unlikely that your low voltage connections are causing a high voltage breaker to trip.

You probably have a shorted high voltage wire.

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