A stationary horizontal drum during the wash cycle may be waiting for a cycle condition or have a mechanical or drive problem. Confirm that it should be turning before looking for a part.
Check when it stopped moving
Note whether it filled, whether the door remains locked, and whether the program keeps advancing. Soaking, heating, or sensing can include pauses. An isolated duration is not enough to confirm a failure.
It helps to distinguish whether it also does not spin or whether only the slow movement fails. A sound that seems like a motor does not prove that the drive reaches the drum.
Mechanical resistance with the machine unplugged
Only after disconnecting, completing safe draining, and obtaining normal opening, inspect the accessible drum without tools. If the manual allows you to move it by hand, do so gently, without trying to force past a stop. Rubbing or noticeable resistance requires checking a locked drum.
If it moves in a seemingly normal way but the program does not drive it, the control, wiring, motor, and drive still need to be distinguished. On units that use one, a broken or slipped belt interrupts that motion; a direct drive calls for other checks.
What cannot be inferred by elimination
Not all motors use brushes. Before blaming worn carbon brushes or replacing a module, the drive diagnosis must confirm the motor type and the signals it receives.
Stop the checks if rubbing, odor, or abnormal resistance appears; continuing to run the program can worsen damage from a mechanical blockage.