Set the timer for Timed Dry. Check the timer for continuity between the black wire and light blue wire. No continuity means bad timer. Check for power at the motor. You should have 120vac between 4M and 6M. With the start button pressed you should have 120vac between 4M and 5M.
I've seen a few intermittent thermal fuses. Check for a 120vac voltage drop between the thermal fuse terminals with the start button pressed.