Last night I walked in and noticed I've have a leak in the corner of my living room so I looked for where it was coming from and on the other side of wall is a closet with my central air unit and my hot water heater, neither are leaking directly.
I notice the water was overflowing from a PVC pipe in the floor (what looks to be a drain) but has a pipe from the hot water heater and a pipe from the central air unit leading down into it.
It doesn't seem to be overflowing constantly--I had it pretty dry last night and my wife took a shower this morning and it started overflowing again.
Why would this be happening?