Each pump has a check valve just above the pump. They are notorious for sticking, causing the problem you describe.
Open the Oasis box where the pumps are located. The leftmost pump is the summer pump. Turn on the unit and open a hot water faucet, then tap on the valve with the handle end of a screwdriver.
This was my problem after 6 months from new, and it resolved the problem, No more issues in over a year.
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2016 Newmar Mountain Aire 4553
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