The Bosch Dishwasher code E04 means: Faulty heater electronics detected in self-test. The control board's self-diagnostic found a failure in the heating electronics circuit.
Difficulty: Major job — consider a pro or replacement
Typical repair cost: approximately $280 (parts + labor).
What to do, step by step
- Reset power at the breaker for 30 seconds and run a test cycle
- Test the heating element for continuity (typically 10-30 ohms)
- Inspect the heater wiring and connectors for scorching or corrosion
- If the element and wiring are good, the control board heater circuit has failed and needs replacement
Video walkthrough
Is the repair worth it?
Before spending money, run the numbers: if the repair quote is more than about 30% of what a new dishwasher costs — especially on an older unit — replacement is usually the smarter call.
Check your quote with our free calculator →
Other Bosch error codes
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Safety first: unplug the appliance (and shut off gas where applicable) before any inspection. If you smell gas, leave the area and call your gas provider.