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It sounds like your condensate drain is clogged. If you have a wet vac and a saw to can probably fix it. Let me know.
It's typically 3/4" plastic and is connected at the bottom of the AC coil. Your refrigeration lines are copper. It would be best if you can post a picture or 2 here so I can point it out to you if you aren't still aren't sure. You can post pics here by clicking on ADD FILES next to the SEND button.
Well, that's a start. It's difficult for me to see which condensate line goes to the AC coil but both of the white PVC lines are condensate lines. Looks like you might have a down flow furnace. Can you back out and give me a wider shot showing where both lines connect to the unit? also a pic of the front of the unit so I can see if the coil is on the top or bottom.
Ok, the top pipe is the AC condensate. Probably easiest to cut the pipe just beyond that first elbow out of the unit in the front. Leave at least 1" of pipe between the cut and the elbow so you can get a coupling back on there to put it back together when your done. Once you cut the pipe put your wet vac on the open pipe end of each side of the cut to suck out the water and slime that's built up over the years and is clogging the pipe
It's not the line that's likely to be clogged it's where the line connects to the condensate pan. So if you're sure you sucked out the pan side then the other possibility is a leaky pan. Replacing the pan is not a DIY project
Also it may take a few minutes for the water that's overflowed to stop dripping
You clear it by vacuuming the line on the coil side. Is you're condensate pump working?
Looks like you have the condensate pump overflow kill switch wired up.
Should be 2 thermostat type wires at the condensate pump. Try connecting them together.
If you connect the 2 thermostat wires at the pump together you'll bypass the switch
It's possible the control board may have gotten wet. So beyond leaving the panels off and letting it dry out there isn't much more you can do.
It's also possible the AC not working has nothing to do with the condensate back up. Usually all it takes is to vac out the pan and the lines when the only problem is the back up.
That's not what I meant and you can't easily get to the pan. Just putting the vac on the line into the pan it usually all it takes. Since the hose on your vac is a lot bigger than the pipe using your hand around the pipe to make a tighter seal can help. But this usually pretty straight forward NBD unless something else is wrong.
Do you have any more questions?