The oven clicks or glows but the burner never lights, so nothing bakes. On a gas Thermador this almost always comes down to the igniter — and this guide shows you how to confirm it, plus the safety line you shouldn’t cross.
Burner won’t light? Call 844-975-6696 or book a visit.
Quick guide
| What you’re seeing | Likely cause | Fix it yourself? |
|---|---|---|
| Igniter glows but no flame | Weak igniter | No — needs replacing |
| No glow, no click at all | Igniter or wiring | No — needs testing |
| Other gas burners don’t work either | Gas supply | Check the supply valve |
| Lights then goes out | Safety valve or flame sensor | No — needs diagnosis |
| Any smell of gas | Stop immediately | Ventilate and call |
Safety first
If you smell gas at any point, stop. Don’t keep trying to light it, don’t switch anything electrical on or off, open a window, and call. A burner that releases gas without igniting is the one situation here that isn’t a wait-and-see — everything else below can be checked calmly.
What causes it
- Weak igniter. The usual culprit: it glows but can’t get hot enough to open the safety gas valve, so no flame.
- Dead igniter or wiring. No glow at all means the igniter or its connection has failed.
- No gas supply. A closed valve or a supply lost after a move — other burners will be out too.
- Clogged burner ports. Debris blocking the flame from spreading along the burner.
- Safety valve. Less common — the valve won’t open even when the igniter is hot enough.
This is the oven burner. If it’s your cooktop surface burners clicking without lighting, that’s a range burner ignition problem instead. For a general no-heat oven, see why the oven won’t heat.
Step-by-step: what to check
- Check for a gas smell first. If you smell gas, stop and follow the safety steps above.
- Test other gas burners. If nothing gas-powered works, it’s a supply issue, not the oven.
- Watch the igniter. It should glow bright, then light a flame within about a minute.
- Glows but no flame? That’s a weak igniter — it needs replacing, not adjusting.
- No glow at all? The igniter or its wiring has failed and needs testing.
- Check the burner ports. With the gas off, clear any debris blocking the ports.
When to call a technician
Call right away for any gas smell, or a burner that releases gas without lighting. This isn’t a DIY fix — gas components and the safety valve must be handled by someone trained.
Book a visit soon if the igniter glows without lighting, doesn’t glow at all, or the burner lights then dies. The igniter is meter-tested for the right current draw and the safety valve checked before replacement — an igniter can look fine and still be too weak to open the valve, which only a test reveals. Book Thermador oven repair to get it done safely.
What the repair actually involves
A technician confirms gas is present, then meter-tests the igniter for the current it should draw — a weak igniter that glows but under-draws can’t open the valve, and that’s the most common finding. It’s replaced (a defined part in the least-expensive to mid category), or the safety valve or wiring if those test bad. The main cost driver is igniter versus valve. You get a written estimate before any work, and the igniter and common gas parts are stocked for a single visit.
Is it safe to use until then?
No — a gas oven that won’t light should not be repeatedly tried, because each attempt can release unburned gas. Stop using it and call. If you smell gas at all, treat it as urgent: ventilate and don’t operate anything electrical nearby.
Preventing it
- Keep the burner and its ports clean so ignition stays reliable.
- Act on a slow-to-light burner early — igniters weaken gradually before they quit.
- Don’t let spills bake onto the igniter area.
Frequently asked questions
Q: Why does my oven igniter glow but not light?
A: The igniter is weak. It glows, but no longer draws enough current to reach the temperature that opens the safety gas valve — so gas never flows and no flame appears. It’s the most common gas-oven fault and needs replacing.
Q: My oven clicks but won’t light — what’s wrong?
A: On a gas oven, persistent clicking with no flame usually means the igniter isn’t lighting the burner. Check that other gas burners work (to rule out supply), and if you smell gas, stop and call rather than keep trying.
Q: Is it safe to keep trying to light it?
A: No. Repeated attempts can release unburned gas into the kitchen. Stop after it fails to light, and if there’s any gas smell, ventilate, avoid electrical switches, and call a technician.
Q: How long does an oven igniter last?
A: Often many years, but they weaken gradually. A burner that takes longer and longer to light is an igniter on its way out — replacing it before it fails completely saves you a dead oven mid-meal.
Get the burner lit again
A weak igniter is a common, straightforward fix once it’s tested. We handle Thermador oven repair with a written estimate before any work starts.
Call 844-975-6696 or book online. Same-day service is usually available in New York, Los Angeles, Chicago, San Francisco, Houston, and Miami.