Does this guide apply to your appliance?

Match the brand, device type and complete display code. The same code can mean something different on another product family or market; a series name does not confirm every model in that series.

No exact model number is recorded here. Confirm the code in your appliance manual before following a check.

Likely causes

  • A relay fault on the dishwasher’s main control board, as Bosch identifies for E03.
  • An internal control-board fault that remains after a power reset; the specific fault requires professional diagnosis.

What to try

Reset power at the circuit breaker

Easy
  1. Switch off the circuit breaker supplying the dishwasher.
  2. Leave it off for 30 seconds.
  3. Restore power and check whether E03 returns.

Source for this check: www.bosch-home.com

Contact Bosch support or a qualified technician if E03 returns

Professional

This is a service referral, not a do-it-yourself repair procedure.

  1. Note the displayed code and your dishwasher’s model number, if available.
  2. Contact Bosch support or arrange service; do not attempt to diagnose or repair the control board yourself.
  3. In the U.S., Bosch lists 1-800-944-2904 for support.

This step is marked professional. Stop if you are not qualified to continue.

Source for this check: www.bosch-home.com

The code returned or the check did not help?

Avoid repeated resets and do not select a replacement part from the code alone. Record the exact code, full model number, when it appeared, and the checks you tried with their results. Share these details with the manufacturer or service technician.

Disconnecting power does not establish that internal components are safe to touch. This guide does not authorize opening electrical components or bypassing safety devices.

Related error codes

Bosch E09Troubleshooting Bosch Dishwasher Error Code E09 (Heating Circuit Failure) Bosch E12Bosch Dishwasher Error Code E12: Limescale Build-up Bosch E14Bosch Dishwasher Error Code E14: Water Inflow/Flow Meter Issue Bosch E15Troubleshooting Bosch Dishwasher Error Code E15 Bosch E16Troubleshooting Bosch Dishwasher Error Code E16 Bosch E17Troubleshooting Bosch Dishwasher Error Code E17

Useful guides

Water left in the dishwasher: safe checks and when to call for serviceA small amount of clean water near the filter may be normal. Water across the tub floor, dirty standing water,... Dishwasher Not Drying? Check Settings, Loading, and Safe MaintenanceUse these owner-safe checks to improve drying, understand what moisture is normal, and know when to call a tec... Dishwasher Filter Care: What You Can Clean—and When to Call a TechnicianLearn how to identify a removable dishwasher filter, clean it safely, and recognize when a pump problem needs...

References