Drum does not rotate or rotates intermittently; display shows F02, sometimes accompanied by humming from the motor area.

Safety: Disconnect power before removing any panels.

F02 indicates the control cannot correctly read the motor speed feedback from the tachometer.

• Check drive belt and drum movement:
  • Remove the rear panel.
  • Verify the belt is on the motor pulley and drum pulley and is not broken or excessively loose.
  • Spin the drum by hand; it should move smoothly without grinding.
• Inspect tachometer on motor:
  • The tachometer is a small coil or sensor mounted on the rear of the motor.
  • Check that it is firmly attached and its connector is secure.
  • Look for broken wires or corrosion at the connector.
• Test tachometer (for trained users):
  • Disconnect the motor plug.
  • Measure resistance across the tachometer pins; typical values are in the hundreds of ohms. Open circuit or short indicates a bad tachometer.
• Check wiring harness:
  • Follow the harness from the motor to the main control board.
  • Look for chafed insulation, broken conductors, or loose plugs.
• If motor and wiring test OK: The fault is likely in the main control board motor drive circuit; replace the power module.