Bosch Dishwasher E02 Error: Main Control Board Relay Fault

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 fault involving a relay on the main control board, as described by Bosch for U.S. dishwashers.
The code does not identify the exact failed component; model-specific diagnosis may be needed.

What to try

Reset power at the breaker

Easy

Switch off the dishwasher’s circuit at the breaker.
Leave power off for 30 seconds.
Restore power and check whether E02 returns.

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

Contact support if E02 returns

Professional

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

If the error returns after the reset, stop troubleshooting internally.
Find the dishwasher’s E-Nr and consult its model-specific manual.
Contact Bosch support or a qualified appliance technician for diagnosis.

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.