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I had 2 Mitsubishi Mr. Slim wall mounted room A/C units recently installed in my house. The guest room unit has the cables and pipes running back through the wall is it mounted on, into the master bedroom closet to a pump, then out to my lanai where it is supposed to drain. Exactly a week after the install I noticed a small (6 inch) puddle of water on the carpet in the guest room about 4 inches from the baseboard. The spot was not underneath the A/C unit, and there was no water on the wall or ceiling. The carpet in the master bedroom closet was also soaked, but there was no visible drip or anything. We had very heavy rains for several days the previous week here in Hawaii, so the water was attributed to the rain since I live on the top floor of my bldg. The spot kept getting bigger and wetter (so big that I had to lay down 5-6 towels to soak it up every few hours) and eventually I had to get professionals in to dry the carpets in the room and the master bedroom closet. It seemed like the water was coming from inside that shared wall where the A/C unit is mounted since the carpet on both sides of that wall were soaked. Thinking that the water was coming from the roof I left the unit running, After 99% of the water was dried from the carpets and the walls, I was still noticing a small wet puddle on the floor in the master bedroom. I decided to turn the A/C off and with in 2 hours it was dry. I called the install guy and told him that the unit was causing this problem. The unit doesn't drip from anywhere, and the guy that did the install came out and poured water in the unit, and it seemed like it ran into the pump in the master bedroom closet like it is supposed to. He told me it was good to go and that there is no way it could create that voolume of water to run down the inside of the wall and puddle up on both sides of that wall. I am stumped... It had not rained in a couple days, and the concrete on both floors looked dry, so last night I turned the unit on again. When I woke up this morning the concrete had a little water seeping along the baseboards on both sides of the wall it is mounted on. The condensation discharge pump does run from time to time as well, so the drain line is draining. It doesn't make sense that a small A/C unit could produce that volume of condensation water (to create a 3' x 2' soaked patch of carpet on both sides of that wall), but twice now when I turned the unit off the water stops seeping onto the concrete and everything drys up (I can see the concrete now since the carpet is pulled up). Sorry for the long story, but basically I am curious if there is any way that one of these units could create enough drain water to run down a wall and seep under the carpet to create a large area of water if it ran for 10 days? Also are there any water lines involved with one of these units other than the drain line? Is there a chilled water line that runs into the unit that could be cracked or broken? I see a couple of insulated lines running into the wall unit, do they have water in them? I obviously have no idea how these things work. Thanks for the help in advance. Ron

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Hi,
Yes, those units will make a lot of water very fast...
No, there are no other water lines involved other then the drain...
However if the refigerant lines are not insulated properly then you can get a lot of water...(condensation) off of them...
I am wondering if the lines are not insulated properly on the wall....it is possible that both units are contributuing to the water problem...
Getting to the lines to check and repair them may be very difficult, but I am sure that the installation that you recieved was subpar...and that is the cause of your problems...

Not sure what you can do a bout it and hopefully you have not paid in full yet, cause I would not make the final payment till the problem is solved... it is obviously an A/C related problem...

heatman101

Posted on Dec 31, 2010

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