Here is a link to your dryer Whirlpool LER6644DQ0 Parts List
When you say it does not work, what do you mean re: no power at all?
Have you checked your circuit breaker?
If the interior light worked before, does it work now?
The most common causes are the door switch and the main thermal fuse.
The thermal fuse will cut power to the dryer | 
My dryer won't come on worked fine the day before 
