Vicki M Houston , TX September 16, 2019 Appliance: Frigidaire Room Air Conditioner FFRH18L2R21 Frigidaire Room Air Conditioner Ffrh18l2r21: Lost remote. How to replace Electronic Control (Main Control Board). Ordered one 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes