Dishwasher stops mid-cycle and shows E04; sometimes accompanied by poor wash performance.

Safety first: Disconnect power and close the water supply before disassembling spray components.

Steps:

• Clean spray arms: Remove upper and lower spray arms by unscrewing or unclipping them. Rinse under running water and use a toothpick to clear blocked jets.
• Check for obstructions: Ensure tall dishes or trays are not blocking the rotation of the spray arms. Spin them by hand to confirm free movement.
• Clean filters and sump: Remove and clean the filter set. Check the sump for debris that could restrict the circulation pump.
• Run a hot service wash: Run the hottest program with a dishwasher cleaner to remove grease and limescale from the hydraulic system.

Advanced:

• If E04 persists, the circulation pump or diverter valve (on models with alternating spray levels) may be faulty. Access the base, inspect for leaks or damage, and test the pump for proper operation.

When to call a technician: If the circulation pump is noisy, seized, or not receiving power, or if the diverter valve is stuck, professional replacement is recommended.