Starr B Danbury , CT January 24, 2016 F7 error code not heating lg electric range We ordered the Pwb(pcb) Assembly,sub, Part Number 6871W1N012B & received the part the next day. I couldn't believe how fast. My husband was able to replace in 15 minutes. My oven worked again! 20 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes