Answer Hi Roger. The answer is absolutly,no. They can "open'' on the inside. The only way to be positively sure is to use an electrical ohm meter. 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 Read More... Answered by AppliancePartsPros.com | Thursday, July 14, 2011