Troy C Aloha , OR January 07, 2018 Appliance: Whirlpool Microwave, Hood WMH53520CS5 Whirlpool Microwave Wmh53520cs5: Microwave doesn't turn on when opening the door intermittent problem. How to replace Microwave Door Interlock Switch. It was recommended that I replace the 3 micro switches inside the door catches. Will see if this resolves the problem. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes