When a residential clothes dryer runs its motor and generates heat but the interior drum refuses to rotate or tumble, the malfunction is almost always caused by a broken, slipped, or worn-out rubber drive belt that wraps around the exterior of the drum wrapper and connects to the motor pulley. Other common 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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