My old 2003 Forest River Sunseeker 3100 SS kitchen sink did the same thing - air locked. Worked fine with valve open but would not drain with closed - Had a small valve behind counter (not to roof). I never messed with it as we always had full hook up or I would open valve a little and drain in bucket - just enough to prevent air lock.
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Darren
2015 Thor Hurricane 34 J
Custom paint 2019 (Pro Custom Inc., Elkhart, IN)
2019 Honda Accord 2.0T Sport 6 speed manual
(THOR)
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