Warren D Monico , WI June 04, 2022 Appliance: Whirlpool Microwave Hood Combo WMH53521HZ0 Whirlpool Microwave Wmh53521hz0: The interlocking switch’s on the microwave door. How to replace Microwave Door Interlock Switch. I ordered the parts from AppliancePartsPros.com. Removed 10 screws. Installed the new switch. Up and working in 20 minutes. The best part is getting the parts. The brand name of the appliance would not sell me the parts but AppliancePartsPros.com would. Thank you! A new microwave would have ran $700 now. Very easy repair. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes