Melinda K Fort Wayne , IN July 05, 2015 Appliance: LG Electric Range LRE30451SW Lg Range Lre30451sw / Awhelga: F9 error code. How to replace Pwb(Pcb) Assembly,Sub. Ordered PWP assembly part. This was an easy part to replace and it successfully fixed the oven. We now have a functioning oven again and thanks to Appliance Pros fast shipping we were only without the oven for 1 day. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes