Safety first: Disconnect power and close the water supply valve.

Clean sump and filters: Remove the filter assembly and clean the sump area thoroughly. Ensure no food debris is blocking the pressure chamber or small ports leading to the pressure hose.
Inspect pressure hose: Access the side of the tub (often left side) to locate the small pressure hose running from the sump/air trap to the pressure switch. Check for kinks, blockages, or cracks. Blow gently through the hose to confirm it is clear.
Check pressure switch: With the hose removed, gently blow into the switch and listen for clicks. Use a multimeter to verify the contacts change state when pressure is applied (refer to Bosch wiring diagram).
Reseat connectors: Ensure the electrical connector on the pressure switch is fully seated and free of corrosion.
Replace faulty parts: If the switch does not respond or the hose is damaged, replace the defective component with the correct Bosch part.

Dishwasher stops filling and displays E05, often shortly after start.

Possible Causes