Jerome P Fargo , ND September 13, 2015 Appliance: KitchenAid Microwave Hood Combination 1.8 Cu. Ft. KHMS1850SBL0 Kitchenaid Microwave Khms1850sbl0: My microwave wouldn't heat so i did some research and decided it was the magnetron. How to replace Microwave Magnetron. I talked to the local appliance repair and they told me it would be $190 for the part. I asked them how much for them to fix it and it was over $300. That was if I took it to them. Appliance part had the part for $130 and it took me 2hrs. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours