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A Question about AC Drain Connected to House Plumbing
Posted on 5/27/26 at 1:53 pm
Posted on 5/27/26 at 1:53 pm
After this last bout with the drip pan filling up constantly, we had an AC tech come out and work on it. He showed me where the drain from the AC is connected to the house plumbing. He cleaned the AC drain and pumped the water from the pan into the drain.
I'm not 100% sure it's related but the AC drains into the pipe that leads to one of the bathrooms. I noticed yesterday that the sink in that bathroom leaks water from above the p trap. Is it even possible to snake that drain? Or do we need to remove the p trap to be able to do this?
ETA: The drip pan no longer fills up. But, I'm wondering if it's just a matter of time before enough water drains from the ac to start backing up in to the ac.
I'm not 100% sure it's related but the AC drains into the pipe that leads to one of the bathrooms. I noticed yesterday that the sink in that bathroom leaks water from above the p trap. Is it even possible to snake that drain? Or do we need to remove the p trap to be able to do this?
ETA: The drip pan no longer fills up. But, I'm wondering if it's just a matter of time before enough water drains from the ac to start backing up in to the ac.
This post was edited on 5/27/26 at 1:55 pm
2
Posted on 5/27/26 at 3:30 pm to MorbidTheClown
quote:
Is it even possible to snake that drain? Or do we need to remove the p trap to be able to do this?
Best to remove the p trap. Clean that and snake the line a little ways. It’s easy.
quote:
I'm wondering if it's just a matter of time before enough water drains from the ac to start backing up in to the ac.
Only if there is a blockage that allows the water to back up higher than the P-trap.
Posted on 5/27/26 at 3:36 pm to UptownJoeBrown
quote:
Best to remove the p trap. Clean that and snake the line a little ways. It’s easy.
Thanks. Sounds like I have an evening project.
quote:
Only if there is a blockage that allows the water to back up higher than the P-trap.
Makes sense. I guess the 2 are unrelated but, the timing is a bis suspicious.
Posted on 5/27/26 at 10:45 pm to MorbidTheClown
After you get it clean, there should be on open line that leds to the drain line on the a/c where you can pour bleach into. You need to do that. About a cup once a month or so. It will kill any algae that grows in the pipe and causes it to back up.
Posted on 5/28/26 at 4:34 am to bbvdd
Don’t pour bleach down the drain. Chlorine fumes will attack the aluminum in your AC.
Posted on 5/28/26 at 9:55 am to UptownJoeBrown
quote:
Don’t pour bleach down the drain. Chlorine fumes will attack the aluminum in your AC.
I have wondered this….what do you recommend for algae control?
Posted on 5/28/26 at 9:59 am to MorbidTheClown
that is why you run the condensate to a vent and not a trap drain
Posted on 5/28/26 at 10:11 am to UptownJoeBrown
So, quick update.
I removed the p-trap, what I think is called the rail piece and also the pvc that connects to the pipe in the wall.
Ran a 15ft auger down the piped, didn't hit any clogs, auger came back clean.
So, I decided to work backwards a piece at a time. Inserted the pvc going to the wall and poured a pitcher of water down it, no problem.
Added the p-trap, did the same thing, no problem. Connected the p-trap and tail piece to the sink and just pouring a large glass of water down the drain causes water to back up through the 2 fittings. the one connecting the tail piece to the p-trap and the one connecting it to the sink.
My last guess is that the washers in those 2 fittings are bad and allowing water to back up through them?
I removed the p-trap, what I think is called the rail piece and also the pvc that connects to the pipe in the wall.
Ran a 15ft auger down the piped, didn't hit any clogs, auger came back clean.
So, I decided to work backwards a piece at a time. Inserted the pvc going to the wall and poured a pitcher of water down it, no problem.
Added the p-trap, did the same thing, no problem. Connected the p-trap and tail piece to the sink and just pouring a large glass of water down the drain causes water to back up through the 2 fittings. the one connecting the tail piece to the p-trap and the one connecting it to the sink.
My last guess is that the washers in those 2 fittings are bad and allowing water to back up through them?
Posted on 5/28/26 at 11:06 am to MorbidTheClown
quote:
My last guess is that the washers in those 2 fittings are bad and allowing water to back up through them?
Sure can. Or you have stripped the threads.
Posted on 5/28/26 at 12:23 pm to UptownJoeBrown
Well, the leak was occurring before I touched it. My next step is going to be replacing the washers and the fittings.
Posted on 5/28/26 at 12:27 pm to MorbidTheClown
Sounds like a plan. Don’t tighten up too much on fittings. Just snug.
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