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Why is My Mini Split Leaking Water? - Ask the Expert Episode 175

Questions about a ductless mini split leaking are common. But the issue is often very easily fixed. Let's hear what Dan Danowski has to say about it.

Judith asks, "Why is my Ductless Mini Split leaking?"

"Hey Dan, my ductless mini split leaks water inside the house and down the wall. A lot of water. The unit is set on cool mode at 75 degrees. It has done this three times now. The water in the drain hose seems to be full of water. I shake it to get it out. It seems to suck what's left back up the hose. What can I do to fix this?" The issue for your ductless mini split leaking seems pretty straight forward. The drain hose is probably not angled downward properly. You definitely shouldn't have to shake it to get the water out. It also shouldn't get sucked back up the drain hose. You might need to fiddle with it a little bit, though. The water drains out because of gravity. So the drain always needs to be going downward. If for some reason you can't do it that way, like you have to go up over something to get the drain hose out of the house, then what you need is a condensate pump. Condensate pumps go inside the air handlers on mini splits and they pump the water out. That's why they are called condensate pumps. Have more questions about a ductless mini split leaking? Just ask them in the comments below or on Facebook or on Twitter.

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Kenny Ziesmer

Why is my 2 ton mr cool heat pump have water coming out with the air and dripping off the louvers drain pan is empty off water it is draining

Victor

I have an older Mitsubishi Mr Slim mini split. Came with the house. About a week ago, I cleaned the filters. Three nights ago, I noticed water dripping from the vents of the wall unit. This went on for two nights, but the unit was cooling. Last night, the unit would not cool. The drain pipe is pitched at the right angle and I haven't noticed ice buildup on the condenser (thought I haven't ruled it out). Could the water drip have damaged the unit?

grego

I have a mr cool mini split in my basement shop on an interior wall. It's hooked to a condense pump about 5 ft away. The drain line definitely has slope, but it has backed up leaking water all over the stuff under it about 4-5 times now. I have noticed some slimy sludge in the line. It did it again this morning. I pulled the cover off and the condensate line and cleaned it as best I could. Do any of the condensate drain pan/line treatments work at keeping the slime/sludge form clogging the drain line?

Nathan Angle

I just installed a mr cool 12000 diy unit. Turned the cool on and after about 10 mins the indoor unit started to leak water.

Julie

Hello, I have been in this house about 10 months. It came with a Carrier 40MHH High Wall Ductless System. About a month or so after I moved in during summer months, I had a water leak event under the unit, about a quarter cup of water. Previous tenant said she'd never had that happen before. About that time I was also getting an error code, so I called a repairman. He cleaned the filter and said everything checked out fine. Turned out the remote needed new batteries which I replaced. Been working fine until last night when I had another leak event. I noticed the cooling hasn't been working very well the past couple of weeks. We haven't had any real hot days, but usually this unit will make it super cold very fast. Last night we had a cold front come through, raining outside and cooler outside than inside, A/C was on set at 70. Last night it started making a loud pinging noise like metal on metal and that's what got me up to see the water dripping down. I shut it off and this morning turned it on and ran the "Self Clean" function, which seemed to work fine and no more water dripping down. Had no problem with the heating function last winter other than it seemed to need to go into defrost mode fairly often. Before I call the repairman again, can you please give me any suggestions as to what is causing the water leak. The unit is only probably about 18 months old. Thanks so much!

Angela Hamilton

Just had a used (2 year old) mini split installed. Seemed to work fine the first night but the second night it started to leak intermittently. I turned it off right away but hours later, it’s still leaking smaller amounts every few minutes. Any ideas? Also, who would I call to fix this?