IF that tube is the fresh water tank overflow, they you do have a check valve problem and your fresh water tank is full.
This is the solution (which I stole from another member...don't remember who though)
Turn city water off ,relieve pressure in the system. Turn on water pump and let water run in a sink for a minute then shut the pump off. This should reset the back flow check valve. Turn city water back on. This happens a lot.
Of course, if you don't want all that water in your fresh water tank, you can either use the water pump or drain it from that valve.
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2015 Dynamax REV 24TB class C
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