I have 2 locations to turn on my Fresh Water Auto Fill, Button at the dash and one in the water bay. (Marathon XL 99) When I turn on the button, nothing happens, the light lights up, there is plenty of water pressure at the street, but no action. This seemed to happen right after I dumped all the water in the bus, emptied everything, water heaters the whole works, went to refill and nothing. Any ideas on how to trouble shoot this??