Terrence P Seattle , WA May 24, 2015 Appliance: Frigidaire Gas Range PLCS389ECD Frigidaire Range Plcs389ecd: Range burners would not light. How to replace Clock Timer. After replacing the burner twice and verifying the fuel holes and orifice was not blocked, we fixed the problem by replacing the wiring harness P/N: AP3965774. That and making sure the burner was tightly screwed into the range base to ensure the correct spark gap. 3 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes