Dishwasher displays E20; unit may stop during wash with water in the tub and no obvious mechanical issue.

Safety first: Turn off power at the breaker before accessing internal components.

• 1. Power cycle: Switch off the breaker for 5–10 minutes to allow the control to fully reset. Restore power and run a short cycle.
• 2. Inspect ground connection: Check that the dishwasher’s ground wire is securely attached at the terminal block or chassis.
• 3. Reseat sensor connectors: Access the main control board and reseat connectors for key sensors (NTC, pressure switch, flow meter, float switch).
• 4. Check for interference: Ensure no high-current devices share the same circuit that could cause electrical noise.
• 5. Replace control board if recurring: If E20 recurs frequently despite stable operation of all components, the main control board may need replacement.

Because E20 is a generic internal fault, professional diagnosis with the correct Insignia service documentation is recommended.