Customer Questions and Answers for Heater Assembly by Whirlpool

Hello Laura. No, not unless your thermostat is bad. If it reads closed for continuity and is good, you will only need the heater WP307178. You can test this with a multi-meter TJMA-DMT3. Here is a link on how to use a multi-meter. Hope this helps. http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/4810-how-check-continuity-ohmmeter.html