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Yes, sure sounds like the backflow device has failed. Find it and get rid of it. Plumb the 2 lines together.
Do not let that unit sit at the dealer while they take their good old time getting to it. Go there and get that unit dried out ASAP of you will have issues forever.
Soft floor on a new unit signals to me that something was leaking LONG before you bought it.
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2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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