Kevin R Hegins , PA June 30, 2015 Appliance: Maytag Microwave Hood Combo MMV4203DW00 Maytag Microwave Mmv4203dw00: Microwave starts running when door is opened. How to replace Microwave Door Switch (Interlock Microswitch). Tested the microswitches at the door, found one that was faulty, ordered a new one from appliance pros, replaced it, and microwave works again 17 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes