When an electric or gas clothes dryer generates plenty of heat to warm up the interior but the drum refuses to rotate or tumble, the malfunction is almost always caused by a snapped, slipped, or worn-out rubber drive belt that has disconnected from the motor pulley. Other mechanical causes include a seized idler pulley arm, worn-out drum support rollers binding against the cabinet frame, or a sheared motor coupling. You can troubleshoot mechanical drives safely by unplugging the unit and inspecting the belt through the service panel. You can verify that your corrective action is successful when replacing a snapped rubber drive belt or freeing a bound idler pulley allows the motor to spin the drum smoothly during a test cycle.
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