John N Las Vegas , NV March 02, 2021 Appliance: Model JTP20W0F1WW Oven temperature would go up past maximum and them lock the door and code F9 Replaced the Sensor Arm. A simple fix yet you need to go and find a video showing how to remove it if yours is a built in oven versus a free standing range that is the how to video on this site. 3 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes