---
title: "Thermador oven error code E303"
description: "Thermador oven error code E303: thermador error code E303: the control module has measured itself over its limit and stopped."
url: "https://thermadormiami.support/error-codes/error-code-e303-oven/"
date_modified: "2026-08-18"
Appliance type: "Wall ovens & steam ovens"
---


# Thermador oven error code E303

Error code

# Thermador oven error code E303

Thermador error code E303: the control module has measured itself over its limit and stopped. What the code covers, what to check first, and what it does not tell you — on wall ovens & steam ovens.

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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 E303, 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

E303

The control module has measured itself over its limit and stopped

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

What it narrows down to

Control module hot

What you are probably seeing

[Oven controls not responding](https://thermadormiami.support/symptoms/oven-control-panel-not-responding/)

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.

- Oven controls not responding
					A touch panel that ignores you, repeats itself, or reports a key held down. On a panel above a cooktop the usual cause is condensation, and it clears when the panel dries.

														Panel unresponsive or erratic

														A code about a key being held

														Dead panel with no lights at all

								[

				What it usually means

			](https://thermadormiami.support/symptoms/oven-control-panel-not-responding/)
A touch panel that ignores you, repeats itself, or reports a key held down. On a panel above a cooktop the usual cause is condensation, and it clears when the panel dries.

- Panel unresponsive or erratic
- A code about a key being held
- Dead panel with no lights at all
In more detail

## About Thermador oven error code E303

### What this one means

The control module has measured itself over its limit and stopped. 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 3** — 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 cooling fan and its circuit
- Ventilation blocked behind or above the oven
- The control module itself

### What to try yourself

- Let the oven cool completely, then run it and listen for the cooling fan
- Check the cabinet cutout is not sealed up behind the trim

### Then what

This is the same story as the panel overheating, one board further in. Built-in ovens shed their heat through the cabinetry, so a remodel that closed up a vent is a real cause and not a stretch.

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.

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**[Read full article: Thermador oven error code E303](https://thermadormiami.support/error-codes/error-code-e303-oven/)**