How to Fix Bosch Dishwasher Error E04

Error Code: E04 Difficulty: Hard

Problem: Faulty electronics in the self-test, often related to the heater.

How to Fix E04 Error (Step-by-Step)

1. Disconnect the dishwasher from its power source and confirm the error stays cleared during a full test cycle.
2. The flow sensor is located in the water inlet assembly. You will need to pull the dishwasher out from under the counter to access this on the side.
3. Disconnect the hoses and wire harness from the flow sensor assembly and replace it with the new part.
4. The heating element is located at the bottom of the dishwasher tub. You will need to access the bottom of the dishwasher.
5. Disconnect the wires from the heating element terminals. Use pliers to remove the nuts holding the element in place.
6. Gently pry out the old heating element and install the new one, ensuring the rubber seals are seated correctly.
7. Reconnect all wires and hoses, slide the dishwasher back into place, restore power, and test.
8. Turn the appliance off, wait about 2 minutes, then turn it back on.

Next Steps and Parts

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