Answer Hello. The DL error on Whirlpool unit's is typically either a door lock failure WP8182634, or a failed CCU board WP8182695. These parts can be tested using a multi meter MA-DM1. I will include a link in this message to an article that details how to test various parts with a meter. I hope this info helps. http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/4810-how-check-continuity-ohmmeter.html Read More... Answered by AppliancePartsPros.com | Friday, June 3, 2011