Blow air through the drain hose it sounds like it's blocked..it could be bugs got in if it sat outside, you mentioned never trying it before so it could just possibly be like some spray foam that got in the line from the factory. if you look under you rv you should see where the line pokes through the bottom to drain. Use low pressure no more then then regulated pressure for water and you should be fine and you should hear the air exiting from under the rv in the location of the drain tube. If there is a drain dust cap the air may just pop it off but unlikely it should be an open tube from that valve straight to the bottom generally..
Good luck hope this helps..
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05 40'4 Atrium 8410 SE
Toad
2017 20' weller's enclosed trailer
2014 Streetglide Special
2010 mini cooper
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