Sounds like a faulty motor. Remove the belt, start washer in spin and spin the motor pulley as fast as you can by hand to see if it will start. If it does, the motors centrifugal switch is probably bad. There are no relays or thermal shutoffs (other than the motors internal thermal overload switch). Power to motor is thru water level switch, timer contacts and speed switch (assume you have tried high and low speed). Check voltage at motor blue wire when you start washer and motor hums. Should be around 120vac. Also check at violet/white wire when in agitate, or at red wire when in spin. Original motor is no longer available and must be replaced with new stye motor that comes as a kit including a capacitor, relay and new wiring harness that must be spliced into existing wiring. Very expensive.

Eric