Glenn S Tucson , AZ June 07, 2015 Ge profile microwave not heating The "Lock" assembly (injection molded plastic) retainer for the upper door switch had worn and no longer held the microswicth firmly in place. The microswitch wold not engage when he door closed, but would be pushed out of position. Replacing the assembly was required. 3 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours