---
title: "Thermador dishwasher error code E04"
description: "Thermador dishwasher error code E04: thermador error code E04: the machine failed its own heater test at start-up."
url: "https://thermadormiami.support/error-codes/error-code-e04-dishwasher/"
date_modified: "2026-08-18"
Appliance type: "Dishwashers"
---


# Thermador dishwasher error code E04

Error code

# Thermador dishwasher error code E04

Thermador error code E04: the machine failed its own heater test at start-up. What the code covers, what to check first, and what it does not tell you — on dishwashers.

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## Book a diagnostic visit

Your model number and a line about what it is doing is enough to get started.

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What we can confirm

## Code E04, from the manufacturer’s own documentation

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 heater test at start-up

or call [(305) 846-7685](tel:+13058467685)

What it narrows down to

Heater electronics

What you are probably seeing

[Dishwasher not drying](https://thermadormiami.support/symptoms/dishwasher-not-drying/)

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.

- Dishwasher not drying
					Plastics coming out wet is how these machines are designed to behave. Glassware coming out wet is a different matter, and on this make the drying is a mineral chamber rather than a heating element.

														Plastics wet, glass and steel dry

														Everything wet, including glass

														Drying noticeably worse than it used to be

								[

				What it usually means

			](https://thermadormiami.support/symptoms/dishwasher-not-drying/)
Plastics coming out wet is how these machines are designed to behave. Glassware coming out wet is a different matter, and on this make the drying is a mineral chamber rather than a heating element.

- Plastics wet, glass and steel dry
- Everything wet, including glass
- Drying noticeably worse than it used to be
In more detail

## About Thermador dishwasher error code E04

### What this one means

The machine failed its own heater test at start-up. 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 circuit on the control board
- The heat pump’s own heater
- The sensor that reports the temperature back

### Worth doing before you call

- Cut power at the breaker for thirty seconds and try one cycle

### Then what

A self-test failure is a board decision, not a setting.

This code is published for dishwashers. The [full list of codes](https://thermadormiami.support/error-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

## Tell us the model number and what it is doing.

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**[Read full article: Thermador dishwasher error code E04](https://thermadormiami.support/error-codes/error-code-e04-dishwasher/)**