The wiring diagram and the cycle chart for the dryer is shown in the first image below. At the end of the cycle, the timer contact GY - WB (Grey to White-Black) should be "open" to disconnect the neutral circuit to the timer so that it will not continue to advance. If the timer is bad, this contact may stick in the "closed" position but you would also need to have another failure in the circuit to complete the neutral path such as a failed push-to-start switch or a bad motor centrifugal switch. A bad push-to-start switch would be evident if the dryer starts as soon as you set the timer in a cycle with the door closed. Two failures at the same time would be rare in a dryer. The failure that you are having could be caused by a short in the electronic control board (part 8558178) for the moisture sensor system. This could provide a ground to the metal cabinet that would cause the timer to continue through the stop position. You can
unplug the dryer
and access that control board in the console. The second image shows how to open the console on this type of dryer. The control board plugs into the wire harness. I recommend that you unplug that control board and remove it from the console. Reassemble the dryer and see if the timer runs and stops properly in a
cycle. If it does, then the timer should be okay and you will probably need to replace that control board. You can order that part from the
website. Be sure that you
unplug the dryer
before accessing internal components.
If the timer continues to run through the "off" position with the control board removed, you could have a bad timer and a short in the wiring to the metal cabinet in the neutral circuit of the timer.
These tips should help you resolve this dryer problem. If you need more help, reply with additional details and we will assist you further.
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services