James C Clifton , TX May 13, 2015 Appliance: Whirlpool 30`` Built-In Electric Combination Microwave Wall Oven WOC54EC0AS00 Whirlpool Oven Woc54ec0as00: F1e5 error code. How to replace Microwave Inverter. Replaced numerous items including this Inverter and two control boards but the Magnetron was the ultimate solution. The tip was clearly burned through when I removed the original. 27 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 2+ hours