Have an odd problem I temporarily solved with a hacksaw this week.
Several weeks ago, my wife called mid-afternoon from our house (in Houston) and water was dripping from a downstairs A/C vent and quite a bit. I rushed home from work and swapped out the bowls with a 5-gal bucket and went upstairs and the upstairs master bath was in worse shape. Water was dripping down the wall behind the sink.
Water was cool & clean and slowed when the A/C turned off. So, the A/C folks I called said to run vinegar through the drain line to clean out and they'd see how soon they could come up. I did this and traced the drain line in the attic as far as I could go with it, but couldn't see where it connected to our drain system, but it headed towards our master bath sinks.
I couldn't see anything unusual under the sinks and the sinks haven't plugged in awhile so not sure how this was an issue, but just for fun I climbed on the roof and snaked the vent I suspected was causing the trouble and sure enough I started smelling vinegar on the debris. This fixed it for a few weeks, then while on vacation it started up again (naturally) so this time I cut the drain line and am letting it fall into the pan under the A/C unit and drip from the emergency drain at the eave.
So, I suspect the A/C installer or plumber did a lousy job of sealing this all up or they should have routed the drain into a trap instead.
FYI, with the A/C running, I could fill up a 5-gal bucket overnight from the dripping we get.
So, any suggestions on the following courses of action?
- Reroute the drain line to another sink vent that sees much less use (hair, etc..)
- Route the drain to the eave and down the side of the house
- Route the drain to an actual sink drain, not an air vent.
- Call a plumber