Judith B Derry , NH February 19, 2023 Appliance: Samsung Microwave Hood Combo SMH1816B/XAA-0000 Samsung Microwave Smh1816b/Xaa-0000 / : Samsung microwave turned on automatically whenever opened door. How to replace Microwave Door Switch. Replaced the door switch. Part arrived in less than 24 hours! 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 2+ hours