The Dometic Rm2620 fridge in our RV is working like a charm when it's parked in our driveway that is sloped, but the minute we level it to camp, the fridge stops working. No A/C and No Propane, but the lights on the control panel all light up and look as though the fridge is working. Please help, it seems our problem is the opposite to everyone else's that I can find online.