Marie N Chester , PA August 31, 2020 Appliance: LG Microwave Hood Combo LMV1813ST/00 Lg Microwave Lmv1813st/00: Dirty charcoal filter. How to replace Lg Charcoal Filter. Read the microwave manual on how to change the dirty filter. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes