---
title: "Bosch error code E04"
description: "Bosch error code E04: the machine failed its own start-up check on the heating electronics."
url: "https://esbosch.djwp.xyz/error-codes/error-code-e04/"
date_modified: "2026-08-28"
Appliance type: "Dishwashers"
---


# Bosch error code E04

### What this one means

The machine failed its own start-up check on the heating electronics.

### 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](https://esbosch.djwp.xyz/error-codes/) has the rest.

What this code means

What this one means

The machine failed its own start-up check on the heating electronics.

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.

---

**[Read full article: Bosch error code E04](https://esbosch.djwp.xyz/error-codes/error-code-e04/)**