Heat source under the kitchen cabinets - 2015 grand design momentum 388m

[Hogrunr]

I see that as well, zoom in on the upper part of the picture and look at the red and blue water lines. There is a white crust on them that is normally deposits from hard water evaporating. It would indicate a slow leak someplace in that area.

So I just opened up the basement, and that white powder is on everything, but it honestly just smells like a dry wall powder, which is strange in itself. I don't see anywhere else that looks like an obvious leak or previous leak. I did identify the heat source, which is the power converter. So the more things like the 3 AC's run, the more heat that it generates.

[LanerC]

It almost has a hint of black tank smell to it more than moisture related mustiness.

If it's the return air to the heater, why is it actively producing and blowing hot air into the kitchen?

Maybe a black water issue leaking into the basement area behind the partition wall where all the drain pipes are located.

[gigattime]

Wonder if previous owner put down some chemical (white powder) for insects (possibly ants)?

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