Daniel Thornton Key Takeaways
- F8 on a CornuFé dual fuel range means oven igniter failure, and the Château gas range lists the same condition as F1.
- Do not repeatedly try to relight a gas oven that fails to ignite; unburned gas can accumulate in the cavity.
- A power cycle clears the code but not the cause, and a weak igniter may light once and then fail again.
- An igniter that glows dim or slowly is failing even if the oven eventually lights.
- If a recently replaced igniter still gives F8, the gas safety valve is the next suspect.
The Bottom Line
F8 is the oven refusing to keep trying to light gas, which is exactly what it should do. Ventilate, cook on the cooktop, do not relight over and over, and book a technician to test the igniter and the valve.
A La Cornue oven that clicks, glows and then gives up is more alarming than a plain no-heat, because the thing it is failing to do is light gas. On the CornuFé dual fuel range this site documents that situation as F8, an oven igniter failure, and the first thing to understand is that the code is the safety system working: the oven stopped trying because trying again and again is the hazard.
| What you see | What it means | What to do |
|---|---|---|
| The oven tries to light for 30 to 60 seconds, then shows F8 | Ignition was not established and the safety valve closed | Stop; do not relight over and over |
| The igniter glows dim, or slowly | A weakening igniter that no longer reaches the needed temperature | Plan the replacement even if the oven eventually lights |
| A brief gas smell as the oven attempts to light | Unburned gas released before the valve closed | Ventilate and do not try again |
| Preheat has been taking much longer lately | An igniter struggling before it fails outright | Book a diagnostic |
| Cooktop burners light normally | The fault is confined to the oven side | Use the cooktop while you wait |
What Does the La Cornue CornuFé F8 Error Mean?
It means the oven igniter failed to light the oven burner, and the control shut the attempt down. This site's dual fuel range F8 page lists it as an oven igniter failure and says to stop using the oven. The Château gas range lists the same condition as F1, so the meaning is shared but the code depends on your model line, and on a CornuFé it is F8.
The mechanism is simple enough to hold in your head. A gas oven does not light with a flame; it heats an igniter until it glows, and the current that igniter draws is what lets the safety valve open. If the igniter is too weak to draw the right current, the valve never opens, no gas reaches the burner, and after an attempt of 30 to 60 seconds the oven gives up and displays F8. Nothing in that chain involves the cooktop, which is why the burners on top can keep working normally while the oven below is locked out, and why the right instinct is to treat the oven and the cooktop as two separate appliances sharing one cabinet.
Is It Safe to Keep Trying to Light the Oven?
No: do not repeatedly attempt to light a gas oven that fails to ignite, because unburned gas can accumulate in the oven cavity and create an explosion risk. Each failed attempt releases some gas, which is exactly why the oven stops after one try and why you should not undo that protection by pressing start again. The cooktop burners operate independently and remain safe to use if they light normally.
- Do not relight repeatedly, and never use a lighter or match to test gas flow in the oven.
- Ventilate the kitchen by opening windows and doors if you smell gas, and wait until it has dissipated.
- Stop immediately if the gas smell lasts more than a few seconds after an ignition failure.
- Cook on the cooktop in the meantime, since its burners do not share the oven's igniter.
Does a Power Cycle Clear F8?
It clears the code, but it does not clear the cause. The page warns that the ignition problem persists after a power cycle, and it adds a detail that catches owners out: a weak igniter may occasionally succeed, which gives false hope before it fails again. An oven that lit on the second try is not repaired; it is a weak igniter on borrowed time.
That is the reason the preheat history matters. Before full failure, a weakening igniter can cause significantly longer preheat times as it struggles to light, so a slow oven in the weeks before F8 is part of the same story. Our oven will not preheat guide covers that slower, earlier stage.
How Can You Tell a Weak Igniter From a Faulty Valve?
Watch the igniter: in a darkened kitchen it should glow bright orange within about 30 seconds of starting the oven. A dim or slow-to-glow igniter is failing and needs replacement even if the oven eventually lights. If the igniter glows brightly and the oven still does not light, the suspicion moves to the safety valve, and that is not something you can test at home.
- Check the oven is cold and off before you look at anything.
- Look at the bottom burner for visible food debris, foil or grease blocking the ports.
- Start the oven in a dark kitchen and watch the igniter through the bottom vent for a bright orange glow.
- Stop at observation. Measuring amperage draw and testing the gas valve need specialist equipment and a certified gas technician.
The Three Causes in Plain Terms
The code page lists three, and only one is something an owner can address:
- A worn-out hot surface igniter has degraded and no longer reaches the temperature needed to open the gas valve and ignite the burner.
- Clogged oven burner ports are the DIY-possible cause: food debris or grease blocking the ports near the igniter stops gas reaching the ignition point.
- A faulty gas safety valve is the bimetal part that should open when the igniter heats up and no longer does.
The page adds a rule worth remembering: if the igniter was recently replaced and F8 persists, the gas valve itself likely needs replacement. That is the sequence a technician follows, igniter first, valve second, and it is why the visit starts with measurements rather than a part order.
What you tell the technician shortens the visit more than any amount of guessing about parts, so it is worth writing a few observations down before you call:
- How long the oven tried before showing F8, and whether you smelled gas at any point.
- How the igniter looked: bright orange, dim or slow, or no glow at all.
- Whether preheat times grew in the weeks before the code appeared.
- Whether an igniter was replaced recently, since that points the diagnosis straight at the valve.
With those four facts the visit can begin with the right measurement, which on this fault is the igniter's amperage draw against the valve's opening threshold, not a general inspection of the range.
When to Book and What the Visit Covers
Book as soon as F8 appears, since the oven cannot be used safely until the igniter is addressed. Our La Cornue range repair page lists an oven that does not heat as a repair that starts from $225, and the final price is confirmed after on-site diagnosis, with a written estimate before any work begins. A gas safety issue is treated as same-day where possible, so say so when you call.
If you are not sure the code is F8 and not something burner-related, appliance diagnostics is the starting point, and you can schedule a visit directly. For the wider safety picture on gas ranges, read La Cornue gas range safety, and for the general no-heat symptom see La Cornue range not heating.