Cakes come out scorched, or a roast takes forever — the oven heats, but not to the temperature you set. On a Thermador this is often something you can correct yourself, and this guide shows you how to confirm it and when it needs a technician.
Nothing baking right? Call 844-975-6696 or book a visit.
Quick guide
| What you’re seeing | Likely cause | Fix it yourself? |
|---|---|---|
| Consistently a bit hot or cold | Calibration drifted | Yes — adjust the offset |
| Way off, or gets worse over time | Temperature sensor failing | No — needs replacing |
| Runs cold, long preheat | Weak igniter or leaking door seal | Partly — check the seal |
| Temperature swings during a bake | Sensor or control fault | No — needs testing |
First, confirm it’s really off
The oven display shows what the oven thinks the temperature is, not what it actually is. Hang a standalone oven thermometer in the center, preheat to 350 °F, and let it settle for 20 minutes. Compare. A gap of 25 °F or more is worth acting on — and tells you whether this is a small calibration drift or a real fault.
What causes it
- Calibration drift. Ovens slowly wander a few degrees over years — corrected with the built-in offset setting.
- Failing temperature sensor. The sensor that measures oven heat drifts or fails, so the oven over- or under-shoots badly.
- Sensor touching the wall. If the probe rests against metal it reads that, not the air, and runs the oven wrong.
- Leaking door seal. Escaping heat makes the oven run cold and cycle constantly.
- Control board. Less common — the board misreads or mis-commands the temperature.
If the oven doesn’t heat at all, that’s a heating fault instead; if the temperature is right on average but food cooks unevenly, see uneven baking.
Step-by-step: what to check
- Verify with a thermometer. Measure the real temperature in the center before assuming anything’s broken.
- Test at two temperatures. Check 350 and 425 °F — off by the same amount is calibration; off by different amounts is the sensor.
- Adjust the calibration offset. Use the oven’s offset setting to correct a steady, consistent gap (usually up to about 35 °F).
- Check the sensor position. Make sure the probe at the back isn’t bent against the oven wall.
- Inspect the door seal. A gasket that’s torn or not sealing lets heat out and the oven run cold.
- Watch for swings. If the temperature drifts up and down mid-bake, that’s a sensor or control fault, not calibration.
When to call a technician
Book a visit soon if the oven is off by more than the offset can correct, if it’s off by different amounts at different temperatures, or if the temperature swings during a bake. These mean the sensor or control needs a meter to diagnose — the sensor is checked for the right resistance at temperature before it’s replaced, so you don’t pay for the wrong part.
It can wait if a simple offset adjustment brought it back in line — that’s normal maintenance. If it won’t hold after adjusting, book Thermador oven repair to test the sensor properly.
What the repair actually involves
A technician verifies the real temperature, then meter-tests the sensor’s resistance against its spec at a known heat. A sensor reading out of range is replaced — a defined, accessible part in the least-expensive category. If the sensor checks out, the trail leads to the door seal or the control board, the higher category. The main cost drivers are which part fails and whether it’s the sensor or the board. You get a written estimate up front, and the sensor and common parts are stocked on the truck for a single visit.
Is it safe to use until then?
Yes — an oven that’s off on temperature is safe to use; only your results suffer. As a stopgap, adjust your recipes by the gap you measured (say, set it 25 °F lower if it runs hot) until the sensor is replaced.
Preventing it
- Check the oven against a thermometer once a year and re-set the offset if it’s drifted.
- Keep the door seal clean and intact so heat doesn’t leak.
- Don’t knock the sensor probe when loading racks or cleaning.
Frequently asked questions
Q: How do I calibrate a Thermador oven?
A: Measure the real temperature with an oven thermometer, then use the oven’s temperature-offset setting to shift it up or down by the gap. Most models let you correct by up to about 35 °F. Your manual lists the exact key sequence for your model.
Q: How far off is normal for an oven?
A: A few degrees is normal and unnoticeable. Once it’s 25 °F or more off, baking suffers. A steady gap you can correct with the offset is fine; one that grows or changes with temperature points to the sensor.
Q: Why are my cakes burning on the outside but raw inside?
A: Classic sign the oven runs hot — the outside sets before the middle cooks. Confirm with a thermometer and correct the offset. If it persists after calibration, the sensor is likely drifting.
Q: Do I really need an oven thermometer?
A: To diagnose this, yes. The display only shows the oven’s own reading, which is exactly what’s in question. An inexpensive hang-in thermometer tells you the truth and confirms whether calibration fixed it.
Get accurate temperatures back
If the offset won’t hold it, the sensor needs testing and replacing. 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.