Try to clean your air filter, condenser and evaporator out. If they are plugged with lint the air can't do it's job. Also make sure the fan is working if there is one inside the compressor cabinet. If all these are in good shape you may need to get a leak fixed in the closed system. You probably have a 3 year warranty on it at least. Just call the repair or service number, or check online for a website for that brand.
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Water, or in this case - condensation will be created and drip from the cooling coils inside the unit outdoors, if installed correctly. This is a normal condition. Like a cold glass of water sitting on a table or counter on a hot, muggy day; condensation will form.
The amount of condensation forming on the glass - and cooling coils of the A/C - is directly related to the amount of humidity in the air.
Some A/C units have fans that not only force cool air out the front of the unit - but also spray condensate on the condenser coils (the coils that get hot and are visible from the outside) to help cool them down.
If water is dripping indoors - the A/C is tilted inward or drain holes on the bottom edges of the rear (outdoors) are clogged. Adjust the A/C support(s) so that it is tilted back (the bottom rear should be about 1/2" or 10mm lower than the bottom front) and inspect & clear obstructions from the drain holes as needed.
The drain hole is under the drip pan, near the rear of the unit. It may be difficult to find if it's clogged. As the clog will blend in with the drain hole. Also, be sure that the rear of your unit is tilted down at the rear, at least 1/4" to 1/2", so that the water will flow to the rear and ultimately to the drain hole. Also, be sure that the air intake filter on the front of the unit is clean and not clogged. As this can contribute to the coils freezing, especially if the humidity level outside is high.
Yes, your drip pan is overflowing, because the drain hole near the back of the unit is clogged. There are 2 ways to address this problem.
1. Look out side the house, under the unit and search carefully for the drain hole or drain tube. If it's a hole, clear it using something like a pipe leaner. It it's a tube, use 2 pipe cleaners twisted horizontally together and carefully run it up into the tubing in a push/pull motion. This will help dislodge any clogs.
2. If you're feeling really lucky, turn the unit OFF and unplug it. Straighten out a wire coat hanger leaving a little hook on one end. Remove the front cover of the AC unit and slide the coat hanger under all the mechanical parts into the drip pan. Sweep it around carefully in the drip pan. all the way to the back of the unit. Be careful not to get the little hooked end caught on anything, by keeping it flat against the drip pan. Doing this, may dislodge any clogs.
And finally, if you're in a high humidity area, increasing the tilt to 1/2" may help improve the drainage.
Part of the problem may be, that you don't maintain enough tilt down on the back of the unit. 1/4" to 1/2" is generally enough to drain the water to the rear of the drain pan. Some drain pans have a hole near the rear of the drain pan. They can be hard to find, if they're clogged, because the clog blends in with the drain pan. Others may have a **** in the corner of the drain pan, rather that a hole.
If you are unable to find the drain hole to unclog it and you're feeling really lucky, you can always drill a 1/8" hole in the rear corner of the pan and create a new one. However, the unit must be unplugged and the pan must be almost dry, before attempting this. In addition, you must be extremely careful when drilling this hole, so as not to pierce any of the mechanical parts above it. In other words, you must be in total control of the drill.
Hope this helps you troubleshoot and solve the problem.
The drain hole (there is no plug) should be on the bottom of the drain pan, outside the house. It may be clogged or the outside part of the unit is not tilted down by 1/4", which allows it to drain properly. Look carefully for the drain hole, as a clog may be concealing it.
In the drain pan under the unit (the part that is outside the window), there is a drain hole, that drains the accumulated moisture/water. It's clogged and that's why you can't see it. Or it may be a small gap in the rear of the drain pan, that' s supposed to do the same thing. If the unit is sitting perfectly level (front to back), the water does not drain well. A slight slope helps.
Hope this helped you to troubleshoot and solve the problem.
Good place to start is up on the roof. Look way under the unit (hard to see some times) along the bottom, between where the gasket sits on the roof and metal bottom of unit. Should see small round or similar sticking down from unit. There will be a hole in the side of them. Poke around with a wire or something to open them up. If you don't see water/condensation running across your roof from unit when it's operating, (usually in 2 directions, 1 each side of unit) then yup, there plugged.