---
title: "Thermador oven error code E309"
description: "Thermador oven error code E309: thermador error code E309: the control module has failed the check of its own program memory."
url: "https://thermadormiami.support/error-codes/error-code-e309-oven/"
date_modified: "2026-08-18"
Appliance type: "Wall ovens & steam ovens"
---


# Thermador oven error code E309

Error code

# Thermador oven error code E309

Thermador error code E309: the control module has failed the check of its own program memory. What the code covers, what to check first, and what it does not tell you — on wall ovens & steam ovens.

- **From $95**

							diagnostic, credited to the repair
- **59**

							cities and neighborhoods covered
- **OEM**

							parts available on order
- **In writing**

							the price, before anything is opened

## Book a diagnostic visit

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

Your details stay private. No spam, ever.

What we can confirm

## Code E309, 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

E309

The control module has failed the check of its own program memory

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

What it narrows down to

Control program memory

What you are probably seeing

[Oven not heating](https://thermadormiami.support/symptoms/oven-not-heating/)

Diagnostic

From $95, credited to the repair

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.

- Oven not heating
					An oven that lights up, sets a temperature and never gets there — or does nothing at all. On a double oven the code tells you which cavity before anyone opens anything.

														Sets a temperature and stays cold

														One cavity works, the other does not

														A code beginning E1 or E3

								[

				What it usually means

			](https://thermadormiami.support/symptoms/oven-not-heating/)
An oven that lights up, sets a temperature and never gets there — or does nothing at all. On a double oven the code tells you which cavity before anyone opens anything.

- Sets a temperature and stays cold
- One cavity works, the other does not
- A code beginning E1 or E3
In more detail

## About Thermador oven error code E309

### What this one means

The control module has failed the check of its own program memory. 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:

- **Three LEDs on the panel blinking out the digits 3, 0 and 9** — 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 control module

### Worth doing before you call

- Switch the oven off at the breaker for a minute and back on

### Then what

The control module is the board that actually switches the elements, so this one usually arrives with an oven that will not heat at all rather than one that heats badly.

This code is published for wall ovens & steam ovens. 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.

---

**[Read full article: Thermador oven error code E309](https://thermadormiami.support/error-codes/error-code-e309-oven/)**