John C Auburn , MA February 20, 2018 Appliance: KitchenAid Microwave KHMS155LWH0 Kitchenaid Microwave Khms155lwh0: Time to replace charcoal filters on microwave. How to replace Charcoal Filter. Really wasn't a fix. It was a replacement of schedules filters. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes