Random behavior, incorrect cycle times, or immediate error F09 at start-up.

Safety: Unplug the appliance before accessing electronics.

• Power reset: Disconnect power for at least 30 minutes to fully discharge capacitors, then reconnect and test.
• Check supply stability: Ensure the outlet provides stable voltage and is properly grounded. Avoid extension cords.
• Inspect control board:
  • Remove the control board cover.
  • Look for burn marks, swollen capacitors, or corrosion.
• Reprogramming: Some Hotpoint-Ariston boards can be reprogrammed with manufacturer tools; this must be done by an authorized service center.
• If F09 persists: Replace the main control board with the exact model and configuration for your washer-dryer.