Ronald B North Brookfield , MA December 07, 2015 Appliance: Samsung Microwave Hood Combo MC17F808KDT/AA-0000 Samsung Microwave Mc17f808kdt/Aa-0000 / : Lost all power. How to replace Microwave Thermostat. Replaced a simple little thermostat cost less then $10.50. Cost thru Sears would have been close to $25.00. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes