Dishwasher displays E20; may be related to circulation or drain pump issues depending on model.

Safety first: Unplug the dishwasher and close the water tap.

• Listen to the machine: At the start of the cycle, note whether you hear the drain pump and then the circulation pump. No sound or humming suggests a motor issue.
• Check for blockages: Remove filters and inspect the sump for foreign objects. Access the drain pump from the base and check for debris in the impeller.
• Inspect wiring: With the base cover removed, check pump connectors and wiring for burns or loose contacts.
• Advanced: Test pump windings with a multimeter. An open circuit indicates a failed motor.
• Replace defective pump: Replace the circulation or drain pump as indicated by diagnosis. This often requires removing the dishwasher from the cabinet and working from the base.