Washer-dryer combo displays F12 and may not start or may randomly reset.

Safety first: Turn off power at the breaker and unplug the unit before inspection.

Step-by-step checks:

• Verify supply voltage: Use a multimeter to confirm correct voltage at the outlet. Avoid using long extension cords or power strips.
• Inspect power connections: With the top or rear panel removed, check the line filter and main control board power connectors for tightness and signs of overheating.
• Check ground: Ensure the ground wire is securely attached to the chassis and not corroded.

When to replace: If power supply and wiring are stable but F12 persists, the main control board’s internal power supply is likely failing and the board should be replaced.