Put the timer in the Electronic dry miser mode, unplug the dryer, open the control panel, remove the red wire from the timer and check for continuity across the "R" and "B" timer terminals. If there is no continuity then replace the timer.
- The part number for the timer is
AP2973903
Here are the break down diagrams for the Whirlpool dryer
Model LEC7848DQ1
Gene.