James P L Cape Coral , FL January 02, 2019 Appliance: Whirlpool 1.6 Cu Ft Microwave MH1160XSQ4 Whirlpool Microwave Mh1160xsq4: Microwave screen would indicate that door would not close and consequently no features could be used. How to replace Microwave Top Interlock Support. Ordered upper and door interlock parts, which only cost $15 or so, plus shipping costs. Got hint online that replacing these parts fixes the problem 90% of the time, and it did. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes