Error code
Bosch error code E04
Bosch error code E04: the machine failed its own start-up check on the heating electronics. What the code covers, what to check first, and what it does not tell you — on dishwashers.
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What we can confirm
Code E04, from the manufacturer's own pages
A code is only meaningful together with the generation showing it — the same two digits mean different things across generations.
The code
E04
The machine failed its own start-up check on the heating electronics
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What it narrows down to
Heating self-test
What you are probably seeing
Diagnostic
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What it looks like from the kitchen
The symptom this code usually arrives with
A code names the subsystem; the symptom is what sent you to look at the display in the first place. That page says what it usually turns out to be, cheapest cause first.
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Usually not a repair Dishwasher not drying
Plastics coming out wet is how these machines are designed to behave, and it is the single most common reason somebody books a repair on this brand that they do not need. Glassware coming out wet is a different matter.
- Plastics wet, glass and steel dry
- Everything wet, including glass
- Drying noticeably worse than it used to be
In more detail
About Bosch error code E04
What this one means
The machine failed its own start-up check on the heating electronics. It is a code the manufacturer publishes for this appliance, not one we have worked out — and it is decoded here rather than left as three characters on a display.
The other ways your machine may say it
The same condition is published under more than one label, because it has been carried across generations of this appliance:
- E04, E0105 — the same condition, on machines of different ages
What the code covers
A published cause names a circuit rather than a component, which is the single most useful thing to know before ordering a part. This one covers:
- The heating electronics
- The self-test that runs before every cycle
Worth doing before you call
- Note whether the machine will run a cold cycle at all
Then what
This one is found before the cycle starts rather than during it, which means the machine will not attempt to heat until it is resolved.
This code is published for dishwashers. The full list of codes has the rest of them, searchable, including the labels older and newer machines use for the same conditions.
This article is based on:
- Official manufacturer documentation
- Internal repair procedures
- Technician repair history
- Company quality standards