John G Gainsville , GA December 13, 2014 Appliance: Kenmore Electric Range 7909912340B Kenmore Range 7909912340B: F5. How to replace Clock Timer. The upper element burned out to begin with. Then the f5 code came on after I replace the element. Researched the problem on appliance parts pros and ordered the control board. Switched out the wires and finished. Actually my daughter did the wire switching. Simple and quick Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes