Larry S Lewis Center , OH March 27, 2015 Appliance: Frigidaire Range PLEFM399DCD Frigidaire Range Plefm399dcd: Electronic oven controller clock/timer showing kept showing error code f13. How to replace Clock Timer. Ordered new part and replaced the Electronic Oven Controller - Clock/Timer unit. It took less than 30 minutes to do and saved me hundreds of dollars in appliance service repair bills by a private appliance repair contractor. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes