Bosch · Dishwasher

Bosch dishwasher E04 code

ErrorE04

E04 is listed by Bosch support as fault detected in heater electronics. The exact checks and component layout can vary by model and region.

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Source-linked guidance reviewed against Bosch US dishwasher error codes.

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What the code means

Fault detected in heater electronics

Do not open fixed panels or test live electrical parts. Record the full model number and arrange qualified service if the code returns after the permitted external checks.

Typical symptoms

01The self-test stops the dishwasher before normal washing continues

02Water may remain unheated and dishes may stay wet

03E04 remains on the display until the heater electronics are inspected

Likely causes

Start with the least invasive explanation and stop if the check requires internal electrical or sealed-system access.

01Fault detected in heater electronics

Safe next steps

1
Stop the cycle and switch the dishwasher off
Follow the exact model manual where access or reset steps differ by product series.
2
Do not repeatedly reset the appliance or remove panels
Follow the exact model manual where access or reset steps differ by product series.
3
Arrange Bosch service for E04; the official guidance treats this internal electronics fault as non-DIY
Follow the exact model manual where access or reset steps differ by product series.

When to stop

Stop if you see damaged wiring, smell burning, find an active leak, suspect gas or refrigerant, or need to remove a sealed electrical cover. Use a qualified appliance technician.