Dishwasher shows F9 and stops; may occur randomly during cycle.

Safety: Turn off power at the breaker before removing any panels.

• Power reset: Leave the dishwasher powered off at the breaker for at least 5 minutes to allow the electronics to fully discharge. Restore power and try a short cycle.
• Inspect wiring harness: Remove the outer door panel to access the control board and user interface. Check all connectors for secure fit and signs of corrosion or burning.
• Check for moisture: Look for signs of moisture intrusion around the control area. Dry gently with a hair dryer on low (no direct high heat) if moisture is present, and correct any door seal issues.
• Surge protection: If the error appeared after a power surge, consider using a surge protector for the dishwasher circuit (where code-compliant) after repair.
• If F9 continues: The main control board or UI board is likely defective. Replacement requires careful handling of static-sensitive components and is best performed by an experienced technician.