Dishwasher shows E20 and may not start or may stop unexpectedly, sometimes after a power surge.

Safety first: Turn off the circuit breaker before opening the control panel or base.

• 1. Power cycle: Disconnect power for 10 minutes, then restore and attempt to start a simple program. If E20 reappears immediately, suspect the electronics.
• 2. Inspect control board: Remove the inner door panel to access the main PCB. Look for burnt components, bulging capacitors, or signs of moisture.
• 3. Check connectors: Ensure all harnesses are firmly seated and that there are no loose or oxidized pins.
• 4. Surge protection: If the error followed a lightning strike or surge, the board is likely damaged and must be replaced. Consider using a surge protector in future.