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Old 11-12-2018, 02:55 PM   #1
RichLP
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Join Date: Jun 2018
Location: Miami
Posts: 11
M.O.C. #21932
Grey water backs up, won't drain till black drain open

Hi again all,

We've got a 2019 Montana 3731FL, and something seemingly odd is happening.

When we've taken a few showers, the shower drain stops draining, and water sits in the drainpan. BUT, when we pull the grey tank drain, the water doesn't drain out. Only after pulling the black tank drain does it go down. We even had it happen with the grey tank valve left open!

Any ideas why this might be happening?

Thanks in advance,

Rich
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