Patrick S Yorktown , VA March 05, 2019 Appliance: Whirlpool Microwave, Hood Combo WMH31017FS0 Whirlpool Microwave Wmh31017fs0: Microwave door switch malfunctioning; ultimately the power shut off. How to replace Microwave Door Switch. Replaced the lower door switch and the fuse on the circuit board behind the power panel. 8 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes