Bosch Dishwashers error code
Heater-electronics fault
The dishwasher self-test has detected faulty heater electronics.
Direct answer
E04 at a glance
- Meaning
- Heater-electronics fault
- Urgency
- Service recommended
- First safe check
- Switch off the dishwasher.
- Model note
- Confirm the code and access instructions in the manual for your exact model.
Likely causes
Why E04 appears
- 01Heater electronics fault
- 02Associated control or wiring fault
Safe diagnostic path
What to check, in order
- 01
Switch off the dishwasher.
- 02
Leave it off until it can be inspected.
- 03
Locate the model number.
- 04
Contact Bosch support for service.
Know when to stop
Don’t push past this point
Do not continue resetting a heating-system fault or open the dishwasher electronics.
Primary source
How this page was checked
The code meaning and manufacturer-specific guidance were checked against the linked support material on August 28, 2026. Confirm details against the manual for your exact model before removing panels or parts.
Read Bosch US: dishwasher error codes ↗Common follow-up questions
About Bosch code E04
What does E04 mean on a Bosch dishwashers?
E04 means “Heater-electronics fault.” The dishwasher self-test has detected faulty heater electronics.
Can I clear E04 by resetting the appliance?
A reset may clear a temporary alert, but it does not correct the underlying condition. Start with the safe checks above and stop if the code returns. Do not continue resetting a heating-system fault or open the dishwasher electronics.
Does E04 mean the same thing on every Bosch model?
Not necessarily. Display codes can vary by model and product family, so confirm the meaning and access instructions in the manual for your exact model before removing covers or parts.
When should I stop troubleshooting E04?
Do not continue resetting a heating-system fault or open the dishwasher electronics.