Michael S Suwanee , GA January 03, 2015 Appliance: Maytag Microwave Hood Combo MMV4205BAB14 Maytag Microwave Mmv4205bab14: Thermistor on micro wave. How to replace Microwave Charcoal Filter. I ordered the part (plus a couple general maintenance items). They arrived the next day - I was shocked! We fixed the unit and we were up and running in less than a day of the order. Great service. 12 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes