Dishwasher displays E20 and may stop during circulation; sometimes accompanied by unusual pump noises.

Safety first: Disconnect mains power and allow the dishwasher to cool before working underneath.

• Clean sump and filters: Remove filters and inspect the sump for bones, glass, or other debris that could reach the pump.
• Access circulation pump: Lay the dishwasher on its back and remove the bottom panel. Locate the circulation pump attached to the sump.
• Check for obstructions: Remove the pump (usually by twisting and pulling) and inspect the impeller area for foreign objects. Remove any debris.
• Test impeller rotation: Ensure the impeller spins freely by hand. If stiff or seized, replace the pump.
• Reassemble and test: Refit the pump, restore power, and run a test cycle to confirm that E20 is resolved.