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

  • The dishwasher detected faulty heater electronics during its self-test, which is Bosch’s stated meaning for E04.
  • The displayed code may need to be checked against the appliance’s model-specific documentation because the E-Nr is unknown.

What to try

Confirm the code and appliance model

Easy
  1. Record the exact display, including punctuation or any additional characters.
  2. Find and record the dishwasher’s E-Nr/model information from its rating plate or documentation.
  3. Check the error-code information for that exact model; do not assume another Bosch code or model has the same meaning.

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

Contact Bosch support or an authorized servicer

Easy

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

  1. Provide the exact E04 display and the appliance’s E-Nr/model information.
  2. Ask Bosch or an authorized servicer to advise on the model-specific code and arrange diagnosis if needed.
  3. Leave diagnosis or repair of the heater electronics to a qualified service professional.

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