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could be thermal overload in motor its a motor protector in the motor
when the motor gets hot it cuts power to the motor when motor cools it
closes and resets age of drier counts some times you can take drier
apart and blow dust out of motor and will fix now if the door is not
closing tight vibration can cause door switch to break contact that
will do it too most of time motor or relay must be replaced
Having checked or replaced what you have thus far here a few things still to check
Cycling thermostat in blower housing,in addition to thermal fuse it must have continuty to be good
Timer check wiring diagram in control panel and check for continuty that are supposed to be closed when set to a normal heat cycle
Motor switch heat circuit check again with wiring diagram and see which wires on motor switch must be closed when running so dryer will heat.This a built curcuit asurring the dryer will never heat when motor is off
If your model has it check heat relay in control panel for continuty on heating circuit for relay(not the circuit that closes relay)
as far as power to the ignitor the hot side comes from timer to and through the thermal fuse and cycling t-stat, to ignitor.the neutral comes from neutral wire on cord to and through motor when motor is running and motor switch is closed
so on ignotor plug check hot wire to ground(not neutral) if has 120 vac to it timer/t. fuse/ cycling t-stat and flame switch are all good and its the motor switch is the problem.The motor switch can not replaced seperatly and must replace entire motor
i would say that it is in the "lockup" circuit in your motor. there is a centifugal switch which moves when it senses RPM of the motor which then in turn closes a set of contacts within the motor housing, thus locking the run contacts to keep your motor running. odds are that the switch, (which moves along the motor shaft) is dry or blocked by debris (lint) that gets caught in the motor housing.
a good cleaning and then a shot of lube on the shaft usuallly solves this problem....
good luck; jay