John B Leland , NC July 06, 2015 Appliance: Frigidaire Electric Range PLES389ECH Frigidaire Range Ples389ech: F 13 error code clock/timer. How to replace Cerama Bryte Cooktop Cleaner. I called Appliance Parts Pros and told them the code. They told me what the problem was. I ordered the Clock/Timer and received it a few days later. It took less than ten minutes to repair it. This was the most trouble free repair experience I have ever had. I removed the 4 control knobs loosened 4 nuts and removed the panel. I replaced the Clock/Timer and reinstalled the panel and it is working like a charm. 9 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes