Appliance Code Check

Bosch · Dishwasher

E04

Service if the code returns

error code

Bosch E04 means the dishwasher detected faulty heater electronics during self-test.

Display form
E04
Lookup normalization
E04
Alternate forms
None retained in the official record

Check the display exactly as shown. The decoder ignores case and spaces, but it never substitutes O/0, I/1, or S/5.

Official meaning, scoped to this source

Bosch E04 means the dishwasher detected faulty heater electronics during self-test.

Manufacturer
Bosch
Document
Bosch Dishwasher Error Codes · Official error-code index
Product family
Bosch dishwashers
Market and locale
US · en-US

This is an official-source interpretation for the stated scope, not a confirmed diagnosis. Meaning can change across brands, models, product families, and markets.

Market, product family, and model applicability

US · en-US · Bosch dishwashers covered by the cited official US error-code index

Exact model applicability has not been verified.

This release retains family or source-index scope only. Do not infer that an arbitrary model uses this code; confirm it in the exact manufacturer manual.

Open the official model/manual lookup (opens in a new tab)

Professional service guidance

Bosch directs E04 to customer support.

  • Contact Bosch support for E04.

Separate hazard signs such as smoke, flooding, sparks, or a burning smell require the manufacturer's safety instructions.

Do not do

Do not access heater electronics, panels, or wiring.

Heater electronics are professional-only.

Check warranty before authorizing service

Warranty coverage depends on the country, model, purchase date, and manufacturer terms. Have the model and serial number available, open the manufacturer's official support or warranty page, and ask whether the service route is authorized before paying for work.

This public record does not make a coverage determination. Use the official model lookup and warranty information linked below.

Open official model lookup (opens in a new tab)↗View source and warranty links

If the message returns

Contact Bosch support for E04.

Source and scope

Official source verified at release
Market and locale
US · en-US
Product family
Bosch dishwashers
Content and safety verified on
July 26, 2026
Source updated by manufacturer
Not supplied in the official record

Bosch

Bosch Dishwasher Error Codes · Official error-code index

Open official source (opens in a new tab)

Verification and review status

  • Content meaning and safety verifiedJuly 26, 2026
  • Source reachability statusOfficial source verified at release
  • Automated evidence review completedPassed · July 26, 2026
  • Automated safety rules checkPassed for this published safety boundary
  • Human technical reviewPending — no human completion is claimed
  • Publication gateAutomated publication checks passed · July 26, 2026
  • Official-source conflictNo unresolved conflict admitted to this public release

Automated checks and release approval are not a substitute for a qualified service professional or the exact manufacturer manual.

Evidence used for this guidance

  • E04 section

    Source-backed summary

    E04 means faulty heater electronics were detected during self-test; contact Bosch support.

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