Dishwasher displays E20, often associated with circulation issues or blocked filters.

Safety first: Disconnect power and allow the machine to cool.

• Clean filters: Remove and thoroughly clean all sump filters to restore proper flow.
• Check spray arms: Remove upper and lower spray arms and flush them under running water. Use a toothpick to clear blocked jets.
• Inspect circulation pump inlet: With filters removed, look into the sump for obstructions at the pump inlet and remove any debris.
• Bleed air: After reassembly, run a cycle and listen for normal pump sound. If cavitation noise persists, check water level and inlet system.