Alan H Kansas City , MO October 25, 2014 Appliance: Frigidaire Freezer LFFH21F7HWG Frigidaire Freezer Lffh21f7hwg: Freezer quit working due to a defective electronic control unit. How to replace Electronic Control. Ordered a new control unit and replaced the defective one. So far, so good; it is working as it should. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes