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Leak in the A/C system
Posted on 6/22/25 at 9:40 pm
Posted on 6/22/25 at 9:40 pm
Noticed it this evening when the fan in my office didnt work. The light still works, but I'm keeping it off. Looked down to a splattering of water on my desk. Not much. Looked up to see a couple of drip stains.
Immediately went to the attic expecting to see an overflowing drain pan. Pan is bone dry except for a tiny bit of water in the corner of the pan. However, there is some sweating in the pipes around it, and the wood beneath is discolored and damp, but not overly soft.
I was in my office Thursday, and it wasnt leaking yet. I left to go out of town and set my A/C for 75 all day while I was gone. I'm not fluent in these systems. Does anyone know what this could be?
Immediately went to the attic expecting to see an overflowing drain pan. Pan is bone dry except for a tiny bit of water in the corner of the pan. However, there is some sweating in the pipes around it, and the wood beneath is discolored and damp, but not overly soft.
I was in my office Thursday, and it wasnt leaking yet. I left to go out of town and set my A/C for 75 all day while I was gone. I'm not fluent in these systems. Does anyone know what this could be?
This post was edited on 6/22/25 at 9:43 pm
3
Posted on 6/22/25 at 11:38 pm to facher08
It looks like water came up through the vent/inspection pipe. Maybe the drain was plugged or is partially plugged until there was enough water backed up to push through it? Run some cleaner down it and put a pvc pipe cap on it, don't glue it though. Better yet, glue a pvc to male NPT fitting on there and screw a pipe cap on it.
Posted on 6/23/25 at 6:54 am to facher08
When we 1st moved in the hallway floor was wet underneath the flooring and seeping up onto the floor.
Called the installation plumber and 3 guys came out since it was a brand new construction. Turns out, not a plumbing issue but rather someone had run a drill bit through the condensation drain line that runs down the separating between shower and jacuzzi tub.
Plumbers fixed it by cutting the holes out and putting a sleeve over section that was removed. Damage was done to baseboard though and will need to be replaced in selling the house eventually.
Called the installation plumber and 3 guys came out since it was a brand new construction. Turns out, not a plumbing issue but rather someone had run a drill bit through the condensation drain line that runs down the separating between shower and jacuzzi tub.
Plumbers fixed it by cutting the holes out and putting a sleeve over section that was removed. Damage was done to baseboard though and will need to be replaced in selling the house eventually.
Posted on 6/23/25 at 7:09 am to sleepytime
quote:
Better yet, glue a pvc to male NPT fitting on there and screw a pipe cap on it.
From the pic, it looks like an overflow sensor goes there. Agree with cleaning. Would be nice if there was a second overflow catch tray but there doesn’t appear to be one for some reason. Other than cleaning out the drain pipe he might be SOL. With no backup catch, better clean it really good. Lots of bleach. Go to tee downstairs, remove, brush out. Maybe blow out if one continuous line, otherwise get shop vac on bottom and suck out.
I couldn’t imagine not having an overflow catch. Makes everything so simple. Literally just glance over at the overflow when you walk by outside and make sure it isn’t wet. That’s all the monitoring required(still a good idea to bleach lines in the fall though)
Posted on 6/23/25 at 9:14 am to sleepytime
quote:
Run some cleaner down it and put a pvc pipe cap on it, don't glue it though. Better yet, glue a pvc to male NPT fitting on there and screw a pipe cap on it.
Isn't it open because it's a vent pipe and covering it will create a vacuum?
Posted on 6/23/25 at 12:37 pm to BigBinBR
quote:
Isn't it open because it's a vent pipe and covering it will create a vacuum?
The vent line is usually somewhere else in the system depending on how it was set up. Many ac guys put a T in the line just like the one pictured to allow for easy inspection and convenience if they need to add some drain cleaner.
Posted on 6/24/25 at 3:19 pm to facher08
Questions for you, is this a horizontal Air handler in the attic? Does it have float switches? Please take another pic or several from further away or of the entire unit. Providing it's a horizontal AHU, seeing both the supply and return would be helpful.
Posted on 6/24/25 at 6:29 pm to sleepytime
quote:
The vent line is usually somewhere else in the system depending on how it was set up. Many ac guys put a T in the line just like the one pictured to allow for easy inspection and convenience if they need to add some drain cleaner.
Drain line is plugged. Happened to me, rain drain line cleaner down it. Still partially plugged and filling up the pan. Come to find out squirrels had stuffed the line with acorns where the drain line came out. Little bastards
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