Drum does not turn or turns erratically; display shows F02 during wash or spin.

Safety: Unplug the washer-dryer before removing any panels.

Steps to diagnose:

• Access the motor: Remove the rear panel. Locate the motor and the small tachometer module at the rear of the motor shaft.
• Check tach connector: Ensure the small 2–3 wire connector on the tach sensor is fully seated. Clean any oxidation and reseat.
• Inspect wiring: Follow the tach wires back to the main control board. Look for pinched, broken, or rubbed-through insulation. Repair or replace as needed.
• Test tach sensor: With the motor removed or belt off, connect a multimeter set to AC volts across the tach terminals. Manually spin the motor shaft; you should see a small AC voltage generated. If no voltage is produced, the tach sensor is faulty.
• Check control board: If the tach sensor tests good and wiring is intact, the fault may be on the control board tach input circuit, requiring board replacement.

Note: Running the machine with a faulty tachometer can cause uncontrolled spin speeds; do not bypass this sensor.