Monica L Clinton , UT January 18, 2016 Appliance: Whirlpool Microwave Hood Combo MH2155XPB1 Whirlpool Microwave Mh2155xpb1: Was time to replace charcoal filters on microwave oven. How to replace Charcoal Filter. We replaced them. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes