Andrew W Point Roberts , WA October 09, 2016 Appliance: Frigidaire Freezer GLFH21F8HBB Frigidaire Freezer Glfh21f8hbb: Freezer light going on and off panel stopped responding each time we opened the door and if would only display a partial number sometimes restart by unplugging it wait 3 hrs and plug back in. How to replace Freezer Defrost Thermostat Thermistor. Replaced the control panel and thermistor just to be safe. All is working like it used to and temp was at -18 after a day. Unfortunately, you cannot remove the old panel without wrecking it. But it was done for anyways. 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes