---
title: "How to Turn On a La Cornue Oven, Gas Side and Electric Side"
description: "How to turn on La Cornue oven cavities: the vaulted gas side, the electric side, and the multifunction trap that catches people."
url: "https://la-cornuemiami.support/blog/how-to-turn-on-a-la-cornue-oven/"
date_modified: "2026-09-03"
Category: "Common Problems"
---


# How to Turn On a La Cornue Oven, Gas Side and Electric Side

## How to turn on La Cornue oven: why this is a real question

Three separate phrasings of it turn up in what people type about this make, and it is not because the owners are helpless. It is because there are three different ovens behind one badge, they are operated differently, and on a dual-fuel range two of them sit side by side in the same cabinet with dials that look similar.

Add the fact that a great many of these ranges arrive with a house rather than with a manual, and "how do I turn this on" is the honest first question.

## Step one, always: which oven

**A vaulted oven** has a thermostat and a broil control and no mode dial. If your dials carry numbers and nothing else, this is you. The gas version has no window in the door.

**A multifunction electric oven** — the CornuFé ovens, the Château Tourelle wall oven — has a mode dial with icons on it, and it needs both dials set.

**On a dual-fuel Château** you have both, one per side. The left cavity on those models is usually the vaulted gas oven with its electric broiler and the right is electric, but it is specified at the factory and worth confirming rather than assuming.

## Turning on the gas side

Set the thermostat to the temperature you want and **hold the control in**. Then wait longer than feels natural.

The reason is worth understanding, because it explains most of the failed attempts. A gas oven's safety valve does not open because you turned a knob — it opens when the igniter draws enough electrical current to prove it is hot enough to light gas safely. From cold that takes several seconds. There is no display and, on a Château, no window, so nothing confirms progress except sound, then smell, then heat at the door.

If it lights, let go and cook. If it lights and then goes out when you release the control, that is flame supervision rather than ignition — a different problem, with its own page.

**Two attempts, then stop.** This is the one place we are firm. A vaulted cavity is sealed, insulated and behind a heavy door, and it holds whatever it is given. Four or five tries over half an hour puts a quantity of unburnt gas somewhere you cannot see it. Turn the range off at its shut-off valve and call somebody.

## Turning on the electric side

The thermostat alone. Elements, a thermostat and, on the vaulted electric ovens, a broil position. Nothing to select and nothing to hold.

If it does nothing, the checks are electrical: the breaker for the range, and any isolating switch. On a fitted kitchen that switch is sometimes inside a cabinet, and it gets knocked.

## Turning on a multifunction oven

Here is the one that catches people, and it catches them because it is not intuitive.

**Both dials have to be set.** The mode dial chooses which heat sources run; the temperature dial chooses how hot. A temperature with the mode dial at off produces an oven that sits there, silent and cold, looking exactly like a broken appliance.

La Cornue's own troubleshooting section lists it as a cause of *oven not coming on*, in this order: is the power on, is the range supply on at the circuit breaker, and — if you are using the multifunction oven — have you set a cooking function. Third on the maker's own list, which tells you how common it is.

While you are there: a **fan inside a circle** is convection. A **bare fan** is defrost, which moves air and heats nothing. Choosing the second when you meant the first gives you a busy-sounding oven and a raw dinner.

## If nothing works on either side

Then it is probably not the oven, and the checks are cheap.

**The breaker.** The range has its own supply and it is a large one — a CornuFé 110 wants a 30 amp breaker.

**Any isolating switch.** Behind a cabinet door, above a counter, sometimes in a pantry.

**Whether anything else in the kitchen lost power at the same time.**

If the supply is proved good and the oven is still dead, that is a visit. On an induction or all-electric model there may be a code to read — a latched U400 means the cooker has been incorrectly connected, and a completely dead display is attributed by the maker to over-voltage or lost supply. On a gas Château there will be nothing to read at all, which is normal for this make and not a sign the electronics have died.

## The one thing worth photographing before you call

Not the display — most of these have none. The **model code** and, if the paperwork survives, the **top configuration code**. G45 and K3 together tell a technician more than a paragraph of description, because they say which modules the range actually carries and therefore which parts to bring.

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