If the door switch or the door-switch actuator is defective, the dryer won't work and you need to replace the failed component. The switch is inside the dryer main housing near the door frame. Sometimes you need to raise or open the top or front of the dryer to reach the switch. To determine if the door switch has failed, watch the part testing video at the link on the bottom of this page.
On many dryers, there's a thermal fuse (a heat-sensitive fuse that blows if the dryer overheats) mounted to the exhaust duct inside the back cover panel. The fuse is about an inch long. It's usually embedded in black resin and mounted in a white plastic housing.
If the fuse has blown, it has no continuity. When this happens, your dryer either just stops heating, or it doesn't work at all. Be sure to inspect the venting/heating system before replacing the fuse to put the dryer back into operation. (You can't re-set this type of fuse.) To determine if the thermal fuse has blown out, watch the part testing video at the bottom of this page.
Often the main wiring connection from the house, at the dryer, burns and the connection breaks. In this has happened to your dryer, you need to replace the power cord and the terminal block inside the dryer to which the wire is attached.
kory hentges, here is what the service manuial says to try first. Check to see if you can get in the diagnostics mode
"The Diagnostic Tests will test and verify all of the inputs to the machine control electronics board. These tests are an overall check of the dryer electronics and the related components. The tests should be run prior to making any of the troubleshooting tests.
ACTIVATING THE DIAGNOSTIC TEST MODE
1. Make sure that the dryer is in the “Standby” mode (plugged in and all of the indicators are off).
2. Press the following control panel keypad sequence all within 5 seconds:
More Time—Less Time—More Time—Less Time.
3. All indicators on the console should nowbe illuminated with “88” showing in the “Estimated Time Remaining” display, if this test mode has been entered successfully." Also, check to make sure that ribbon connectors P3 and P4 are inserted all the way into the machine control electronics board. The service manual also suggest that, if you unit should not power up, to:
" 1. Check the 120 VAC electrical supply.
2. Check the wiring harness connections.
3. Check the control electronics."
The attached image is the wiring diagram for the dryer. you can clearly see that the door switch is a definite possibility. If your door switch is not functioning, your drum light will not come on. Hope this helps, good luck.