How to Fix Bosch Dishwasher Error E03

Error Code: E03 Difficulty: Hard

Problem: Main control board relay fault.

How to Fix E03 Error (Step-by-Step)

1. Shut off the power and water supply to the dishwasher.
2. The water inlet valve is usually located at the bottom front of the dishwasher, behind the lower access panel. Remove the panel to access it.
3. Disconnect the water supply line and the outlet hose from the valve. Have a towel ready for any residual water.
4. Disconnect the wire harness from the valve. Remove the screws holding the valve in place and take it out.
5. Install the new water inlet valve, ensuring all connections are tight. If the issue persists, replace the main control board by removing the door panel to access it.
6. Reconnect all wiring to the new control board based on your previous photos.
7. Reassemble everything, turn the power and water back on, and run a test cycle.
8. Turn the appliance off, wait about 2 minutes, then turn it back on.

Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.