Have a new MRL Virginia controls MVF with panel view that keeps blowing MOVFRW water proof A.C. 1 line fuse in controller, changed wires from motor to operator. When I get on sight the car is at top landing and doors are closed with fuse blown in controller. Any info why fuse would blow beside a short because it's very intermittent and every couple days it will shutdown with AC1 230v fuse in controller blown?