Dishwasher shows E22 and may stop with dirty water in the bottom; filters may be heavily soiled.

Safety first: Disconnect power before reaching into the sump.

• Remove and clean filters: Take out the coarse filter, microfilter, and any metal mesh filter. Wash them thoroughly with hot water and detergent.
• Inspect sump: Remove the sump cover and check for food debris, labels, or plastic pieces blocking the drain inlet. Remove all obstructions.
• Check non-return valve: Locate the small flap at the drain outlet in the sump. Ensure it moves freely and is not jammed by debris.
• Run a hot cleaning cycle: After reassembly, run an empty hot program with a dishwasher cleaner or a cup of white vinegar (in a dishwasher-safe container) to dissolve grease.
• Regular maintenance: Clean filters weekly to prevent recurrence of E22.