---
title: "Bosch error code E09"
description: "Bosch error code E09: the heater inside the heat pump is not behaving as the control expects."
url: "https://boschmiami.support/error-codes/error-code-e09/"
date_modified: "2026-08-18"
Appliance type: "Dishwashers"
---


# Bosch error code E09

### What this one means

The heater inside the heat pump is not behaving as the control expects. 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:

- **E09, E20, E2030, E6001** — the same condition, on machines of different ages
- **Active and Sanitized lights flashing** — how a model with no digital display says it. On that machine, the lights are the code
- **Clean and Sanitized lights flashing** — how a model with no digital display says it. On that machine, the lights are the code

### 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 element inside the pump assembly
- Its sensor
- The circuit driving it

### Worth doing before you call

- Cut power at the breaker for thirty seconds
- Check whether the machine has recently shown a scale code — scale is behind a real share of these

### Then what

The heat pump combines circulation and heating in one assembly, so this is the expensive end of the machine. Descaling first is worth it if the machine has been asking for it.

This code is published for dishwashers. The [full list of codes](https://boschmiami.support/error-codes/) has the rest of them, searchable, including the labels older and newer machines use for the same conditions.

What this code means

What this one means

The heater inside the heat pump is not behaving as the control expects. 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:

E09, E20, E2030, E6001 — the same condition, on machines of different ages

Active and Sanitized lights flashing — how a model with no digital display says it. On that machine, the lights are the code

Clean and Sanitized lights flashing — how a model with no digital display says it. On that machine, the lights are the code

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 element inside the pump assembly

Its sensor

The circuit driving it

Worth doing before you call

Cut power at the breaker for thirty seconds

Check whether the machine has recently shown a scale code — scale is behind a real share of these

Then what

The heat pump combines circulation and heating in one assembly, so this is the expensive end of the machine. Descaling first is worth it if the machine has been asking for it.

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.

---

**[Read full article: Bosch error code E09](https://boschmiami.support/error-codes/error-code-e09/)**