My 5-year-old Furrion FMCM15-SS seems to have a different problem than those I’ve read in this forum. No blown fuse or loss of power—clock, door, interior light, & convection function all work normally. Only the microwave function is inoperative, even though it sounds as though it’s working—slightly louder, actually, with almost a rattle.
Leaning toward a new unit, unless someone has a better idea. Stephen, would you please post the model number of the Insignia you found through Best Buy? Thanks.

Terry