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Pvp pipe from drip pan is not draining what can i do

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If the water is backing up clean out the drain line or replace it. Code requires a trap and traps catch dirt and plug. Would be nice if they put a clean out on these but it does not always happen.

Posted on May 27, 2008

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Smelly air conditioner


If it is a split unit like the one in the image, the drip pan is under the evaporator and it drains automatically to outside via a black 1/2" utility pipe.

Jul 21, 2016 | American Standard Allegiance 15 4a7a5036e...

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Condensation water does not leave pan when it gets full you can hear the water being picked up and thrown around in the unit. There is no water flowing either inside or outside unit.


What you hear is an indication that the drain hole in the drip pan is clogged. Check the outside of the bottom of the drip pan. The hole may be hard to locate, as the clog can blend in with the drain hole. It may take patience & persistence to find it. A pipe cleaner works well to clear the hole. And while you're at it, check the downward tilt of the rear of the unit. The general rule of thumb is 1/4" to 1/2" downward tilt. This will help to water to flow to the rear of the drip pan and out thru the drain hole.

Hope this helps you and thanks for choosing FixYa.

Sep 05, 2011 | Electrolux Air Conditioners

1 Answer

I have a Haier Air Conditioner window unit that is leaking inside the house. What are some possible causes and solutions?


There are basically 2 causes:

1. The rear of the AC unit is not tilted down enough, so that water in the drip pan flows to the drain hole in the rear of the drip pan. The general rule of thumb for rear downward titl is 1/4" to 1/2".

2. The drain hole in the drip pan, near the rear of the unit is clogged. Locating the clogged hole can be a challenge, as the clog will blend in with the drain hole. Patience & persistence are needed in locating it. A pipe cleaner works well to clear the clog from the hole.

Hope this helps you and thanks for choosing FixYa.

Aug 17, 2011 | Haier (HPE09XC6) Air Conditioner

1 Answer

Terrible foul ordor coming from air conditioner


Two things may be causing this. A dirty air intake filter and/or the drip pan is not draining as it should.

Remove the front air intake filter and clean it, if necessary.

While the front is Off and the filter is removed, look at the drip pan under the mechanicals. If you see water standing, the unit is not draining as it should. This can be the result of the drain hole near the rear of the drain pan being clogged and/of not enough downward tilt on the rear of the unit. The general rule of thumb is 1/4" to 1/2" of downward tilt. Finding the drain hole can be a challenge, as the clog can blend in with the drain hole. Be patient and persistent in locating it. A pipe cleaner works well to clear the hole.

If none of the above applies, look for dark stains in the drip pan. These stains could be mold. In which case, add a couple of drops of bleach to the water in the drain pan. It may smell like bleach for a while, until the water dilutes it and drains it and the mold away.

Hope this helped you and thanks for choosing FixYa.

Aug 07, 2011 | Kenmore 75121 Thru-Wall/Window Air...

1 Answer

MLG LS307HV. Condensation is dripping off the bottom of the indoor unit. We've mounted the unit level but the left side continues to pull up. The wall mount is level but he unit is slightly out of...


the inside unit should be mounted with a slight tilt to the outside - so the water can drain outside.
also - be sure your drain hole (in the unit) is not plugged - either with dirt/debris.

Aug 04, 2011 | LG LS307HV Air Conditioner

1 Answer

My ac unit is now after 3 weeks of use dripping water inwards(even with a 1/4" slope of the unit to the outside) is my drip pan overflowing?


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.

Hope this helps you unclog the problem.

Jul 20, 2011 | Air Conditioners

1 Answer

We live in an apartment complex and have a Trane Air Conditioner, each unit has its own central air. I believe the one in our unit has clogged drain pipes, when we first moved in we didnt change the air...


Hello You have to cut the pipe and blow out each end,You can use a 1"rubber hose from an auto parts store & 2 hose clamps, If you can't find the end.This will allow access in the future to clean out the pipes.It will slip over 3/4" PVC pipe.They sell a PVC pipe cutter but a hacksaw blade works well.Get ready for all the water in the pan once you cut!

Sep 14, 2010 | Air Conditioners

1 Answer

I have a Weather King AC/Furnace in the attic that's dripping water into the drain pan. When we purchased our new house it came with this unit and it never dripped ater. Now, the water is dripping towards...


I assume it is dripping water when the AC is running. If you look at the attic unit, there should be a PVC pipe running from the unit - probably an insulated PVC pipe. This pipe probably goes across the attic to the edge of the house and drains outside. The drain pan may also have a drain pipe, but the one on the AC unit is the issue, and is probably plugged. Go outside and see if you can locate the AC drain pipe. See if the ground is wet below the pipe and if water is steadily dripping from the pipe (with AC running). If the pipe and ground are dry, the pipe is plugged. If you have a wet/dry vac, try connecting it to the drain pipe outside to see if you can **** the pluggage out. If you can get it clear, water should start dripping out of the pipe. This same thing happened at our house. I decided to cut the pipe in the attic, and add in a PVC isolation valve, tee, and water hose connection with plug, so I can valve out the AC unit from the pipe, remove hose connection plug, and hook up a water hose and flush the line to outside. Lowe's sells all of the PVC pipe fittings. The water pressure from the hose will always flush out the algae and crud to the outside of the house. I can also remove the plug and pour a cup of bleach down the drain pipe every couple of months to keep algae growth in check. I also cut out the trap (u-leg) from pipe in the attic and purchased a ready made trap a Lowes (the contractor who built our house had made a lousy homemade trap). I purchased a few PVC elbows and installed the trap on the drain pipe outside. By the way, our AC drain pipe comes out of our wall outside and drains near our outside unit. Our secondary drain pan drain pipe comes out outside from an eave on the side of the house. I don't know what you drain line looks like (it may have a port to add bleach, or some cleanout provisions, maybe not). If you choose to modify/improve it, then make a sketch of it, go to Lowe's and get the PVC parts you need + PVC pipe primer and cement. PVC cement dries fast. Remember, the pipe must flow downhill from you AC attic unit. You can use a regular wood saw to cut the pipe. I hope this helps you. You need to keep the drain line clear as algae will continue to grow in it. Pouring bleach in the line every month or two helps. You also need to check maybe once a month that the line is draining properly (check to see if dripping outside). You can get some serious water damage to your ceilings if the water backs up and overflows. I discovered that our drain line was plugged just in time as our drain pan drain line was also partially plugged and drain pan was about to overflow.

May 08, 2010 | Weather King 12AJA4201AH Air Conditioner

1 Answer

My Daewoo DSB 091L unit has started to drip condensate from the casing joint underneath the front drainage tray. I have cleaned the blocked drain pipe and proved the water drains away. The condensate drip...


Make sure that the flexible pipe is securely connected to the drainpan, it can come adrift and cause leaking. The way to check this is to make sure everything is dried out completely. Then open the front grill and carefully pour water so that it goes only into the drip pan. Pour slowly so that you do not overflow the pan. If water is coming out on the outside and you have no leaks on the inside, then you can rule out the perished or disconnected drainpipe theory. In this case your unit may be short of refrigerant causing excessive run time and a freeze up of the evaporator.

Mar 24, 2009 | Air Conditioners

1 Answer

Hi, I have water dripping from my a/c, on the inside


The condensate drain line is probably clogged.

Find out where the pipe exits the home, and attatch a wet/dry shop vack to the end of the drain line, close it up around the pipe as much as possible and trun it on.

These typically get clogged with dust, dirt, pet hair, mold etc.
They usually clog at the elbows, P-traps and the inlet coming from the drain pan. There is an internal drain pan in the unit that catches the condensation. When the line clogs the pan overflows and you have water dripping from the unit.

There is also a small chace the pan has a hole in it, but thats fairly rare. There is also a chjance that if the unit is not level the water will overflow the pan before it can drain. (most pans are only 1 to 2 inches deep.) Make sure the unit is level or veryslightly lower toward the drain side.

Dec 09, 2008 | Air Conditioners

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