La Cornue Oven Not Heating
La Cornue Oven Not Heating is a common question among La Cornue owners. This guide walks through it step by step with technician-grade detail.
If your La Cornue gas oven (including a vaulted oven) won’t heat, the most likely cause is a weak or failed glow-bar igniter. This guide explains how the system works and how to diagnose it.
How gas oven ignition works
When you set a temperature, the glow-bar igniter heats up and draws current through the gas safety valve. Only when the igniter draws enough current does the valve open and release gas, which the hot igniter then lights. If the igniter weakens with age, it may still glow but no longer pull enough current to open the valve — so gas never flows and the oven stays cold.
Telltale symptom
The classic sign of a weak igniter is that it glows orange but the oven never lights and never warms. A failed igniter that does not glow at all points to an open igniter or a wiring/power issue.
Diagnosis steps
- Set the oven to bake and watch the igniter (visible at the oven burner). Does it glow?
- If it glows orange but no gas lights within a few minutes, the igniter is weak and not drawing enough current — replace it.
- If it does not glow at all, check power to the oven and inspect the igniter and its wiring for breaks; the igniter may be open (failed).
- If the igniter glows strongly and you hear gas but no flame, suspect the safety valve.
Other possibilities
- Safety valve: A failed valve won’t open even with a good igniter — gas connection work for a technician.
- Thermostat/sensor: A faulty oven thermostat can prevent a heat call. See our temperature drift guide.
- Hi-limit trip: A tripped safety thermostat can cut power — see our hi-limit guide.
Repair, not replace
A weak igniter is an inexpensive, replaceable part — never a reason to replace the range. See our igniter repair-or-replace guide.
Professional service
Igniter and valve work involves gas safety. Schedule an oven repair to restore heat. Model details are on lacornueusa.com.
The two failure signatures
A glow-bar igniter fails in two recognizable ways, and telling them apart guides the fix. The classic weak-igniter signature is an igniter that glows orange but the oven never lights — it no longer pulls enough current to open the gas safety valve, so gas never flows. The second signature is an igniter that does not glow at all, which points to an open (failed) igniter or a wiring/power problem rather than a merely weak element. Watching the igniter through a bake cycle is the most informative single diagnostic you can do.
When it is not the igniter
If the igniter glows strongly and you can hear gas but still get no flame, suspect the gas safety valve — a technician task involving the gas connection. A faulty oven thermostat or sensor that never calls for heat can also masquerade as a heating failure; see our temperature drift guide. And a tripped hi-limit can cut power entirely — see our hi-limit guide.
Frequently asked
- Can I replace the igniter myself? No — it involves the gas burner assembly and connection; leave it to a certified technician.
- Why did it fail gradually? Igniters weaken with age and thermal cycling before failing outright.
How the ignition system works
Understanding the sequence makes the diagnosis obvious. When you set a bake temperature, the glow-bar igniter heats up and draws current through the gas safety valve; only when it pulls enough current does the valve open and release gas, which the hot igniter then lights. As the igniter ages it can still glow yet no longer pull enough current to open the valve — so gas never flows and the oven stays cold. That is why a weak igniter is a replaceable consumable, not a reason to replace the range; see our igniter repair-or-replace guide.
