Our new 2020-1/2 239ML had a major drain leak from the kitchen sink toward the grey tank. There is a ABS pipe connection to the left of the furnace, against the wall (over the wheel well). The pipe was not cut straight and when it was glued in it didn't seal at that bad cut. I had to cut away the bad area and used an under-sink flexible coupling from Lowes with hose clamps to make the connection. Water everywhere, but I dried up what I could an then put a fan with heat on the carpeted wheel well and surrounding area for a day or two. So turn on that kitchen sink, pull the vent in front of the furnace, and use a flashlight to watch for any drips, or gushes as in our case.
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