Bosch Dishwasher error code
Bosch Dishwasher Error E03
Main control board relay fault.
Main control board relay fault.
Try these first
Start here before buying a part or taking the appliance apart.
- 1Check 1
Reset power by disconnecting the dishwasher from the power source for at least 30 seconds.
- 2Check 2
Ensure the water supply is turned on and the hose is not kinked.
- 3Check 3
Check the water inlet valve for any blockages or damage.
A quick explanation
What does E03 mean?
Main control board relay fault.
The answer you came for
How to fix Bosch dishwasher error E03
Start with the safest checks and work from simple to technical.
- 1
Step 1
1. Shut off the power and water supply to the dishwasher.
- 2
Step 2
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
Step 3
3. Disconnect the water supply line and the outlet hose from the valve. Have a towel ready for any residual water.
- 4
Step 4
4. Disconnect the wire harness from the valve. Remove the screws holding the valve in place and take it out.
- 5
Step 5
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
Step 6
6. Reconnect all wiring to the new control board based on your previous photos.
- 7
Step 7
7. Reassemble everything, turn the power and water back on, and run a test cycle.
Read the additional checks from the current guide
How to Fix E03 Error (Step-by-Step) Shut off the power and water supply to the dishwasher. 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. Disconnect the water supply line and the outlet hose from the valve. Have a towel ready for any residual water. Disconnect the wire harness from the valve. Remove the screws holding the valve in place and take it out. 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. Reconnect all wiring to the new control board based on your previous photos. Reassemble everything, turn the power and water back on, and run a test cycle. Turn the appliance off, wait about 2 minutes, then turn it back on. Recommended Parts to Check No exact official OEM part number is listed here because the correct Bosch dishwasher part can vary by complete model number. These are targeted part-category searches, not universal fit claims. Bosch dishwasher water inlet valve Common replacement category: Water inlet valve Fit note: Exact OEM part number varies by full Bosch dishwasher model number. Confirm compatibility before buying. Confidence: MediumThis category can be relevant for fill and water-supply faults after the tap, hose, and inlet screen are checked. Search Amazon for Bosch dishwasher water inlet valve Bosch dishwasher drain pump Common replacement category: Drain pump Fit note: Exact OEM part number varies by full Bosch dishwasher model number. Confirm compatibility before buying. Confidence: MediumThis category can be relevant for drain and standing-water symptoms after the filter, sump, and hose are checked. Search Amazon for Bosch dishwasher drain pump Bosch dishwasher circulation pump Common replacement category: Circulation pump / wash motor Fit note: Exact OEM part number varies by full Bosch dishwasher model number. Confirm compatibility before buying. Confidence: MediumThis category can be relevant for wash, spray-arm, and circulation symptoms after filters and spray arms are checked. Search Amazon for Bosch dishwasher circulation pump Before ordering: match the part to the complete Bosch dishwasher model number on the appliance tag. Still Not Working? If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure. Ask a Technician Online – Get Answer in Minutes Find a Local Repair Pro Near You
What may be causing it?
- Faulty water inlet valve
- Blocked or kinked water supply hose
- Defective main control board
These are possibilities to investigate, not proof that one part has failed.
Recommended part
Recommended part for this error code
Replacement part
OEM candidate: 00607335
Price noted in the current guide: $180-$410
Why this part is shown: It is associated with Bosch Dishwasher error E03 in the current guide. The error code alone does not prove this part has failed.
Compatibility varies by model. Confirm that the Amazon listing includes your complete dishwasher model number before ordering.
You can open the recommendation now. Check model compatibility on the Amazon page before purchasing.
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Repair or replace calculator
Use the age and total repair estimate to get a simple comparison. This is guidance, not a guarantee.
Safety first
Disconnect power before opening panels or touching internal parts.
When to stop
- Stop if you see burned wiring, melted connectors, water near electrical parts, or a gas smell.
- Do not perform live-voltage testing unless you are trained and equipped for it.
- Use the exact model manual or service information before replacing electronic controls.
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