Why does my split ac unit leak inside the house?

SOURCE: goodman mini split unit condensating and leaking

Hi, your evap. drain is block, i know you are smart, we can do this, remove front cover of evap.(indoor unit) check for location of screws, look carefully you will see drain connection and tray, try to clean, use mild cleaning solvent, or practical way push something flexible into tubing, also clear your air filter, and you'll be in good shape, also check leveling of evap(indoor unit), with spirit level, should be horozontally leved. good luck.

SOURCE: Water is not draining from outdoor pipe, the water

You can try running a small pipe snake or even a coathanger through it. If you can't reach it, and if you can seal all the open connections except the outlet, you can try using compressed air to clear it. Be careful though, A/C contractors are notorious for not cementing all the connections on PVC pipe. If it's blocked and one of the connections is loose it'll blow apart and make a mess.

SOURCE: A.C. unit is draining on the inside of the house.

There is a drainage and it is stucked with dust, mold etc. Just open metal lid on the wall inside your house, where the coil is installed and where you're changing filters, remove air filter, there at bottom you will see the drainage hole (now under water probably). Rent an air compressor from Home Depot or Lowe's, stick the hose to that hole and turn compressor on. This shall blow the drainage through. After that slowly pour 1-2 cups of Chlorox or Tylex in there, let it stand for 15 minutes, then pour some more water and blow with compressed air again, then flush it with water and blow last time.
Do that at least once in two years, or you gonna have same problem again.

SOURCE: My LG Split AC leaks,

Hello, make sure the unit is tilted back somewhat so the Condensate can drain toward the back and not collect up in the front. Also, make sure the drain tube is not obstructed or blocked with sludge.