A new hum, grind, or rattle from the oven is easy to worry about — but some oven sounds are completely normal, and only a few point to a real fault. This guide helps you tell which is which on your Thermador.
An alarming noise? Call 844-975-6696 or book a visit.
Quick guide
| The sound | Likely cause | Normal? |
|---|---|---|
| Fan running after the oven is off | Cooling fan | Yes — normal |
| Soft hum during convection | Convection fan | Yes — normal |
| Clicking during preheat | Relays or igniter cycling | Usually normal |
| Grinding or squealing | Fan motor bearing | No — needs service |
| Rattling or buzzing | Loose part or failing fan | No — check it |
The normal sounds first
Three noises surprise people but are perfectly normal. A cooling fan that keeps running after you switch the oven off is doing its job protecting the electronics — it can run for many minutes. A soft hum on convection is just the fan circulating air. And light clicking during preheat is the relays or gas igniter cycling the heat on and off. None of these need attention.
The sounds that mean a problem
- Grinding or squealing. A worn convection or cooling fan bearing — it only gets worse.
- Loud buzzing or humming. A fan motor struggling, or a blade catching.
- Rattling. A loose panel, rack, or fan blade vibrating.
- Constant clicking that never lights (gas). The igniter trying and failing to light the burner.
If a grinding fan is the culprit, see the convection fan guide; if the clicking never produces a flame, that’s a burner ignition problem.
Step-by-step: locate the noise
- Note when it happens. During preheat, on convection, or after the oven is off — each points somewhere different.
- Rule out the cooling fan. Noise after shut-off is almost always the normal cooling fan.
- Check for loose parts. Make sure racks are seated and no panel or cover is vibrating.
- Spin the convection fan cold. Stiffness or grinding by hand confirms the bearing.
- Listen to gas clicking. Clicking that ends in a flame is normal ignition; clicking with no flame is a fault.
When to call a technician
Call right away if a gas oven clicks repeatedly without lighting, especially with any gas smell — stop and get it looked at.
Book a visit soon for grinding, squealing, or loud buzzing. A failing fan bearing is meter-tested and the motor checked for free spin before replacement — running it to failure can leave metal shavings and a bigger repair. Book Thermador oven repair before it gets worse.
What the repair actually involves
A technician traces the noise to its source, then meter-tests the suspect fan motor for continuity and spins it for bearing wear. A worn convection or cooling fan motor is replaced — a defined part, mid category — or a loose blade or panel simply secured. If it’s a gas ignition noise, the igniter is tested instead. The main cost driver is whether it’s a quick tightening or a motor. You get a written estimate up front, and common fan parts are stocked for a single visit.
Is it safe to use until then?
Normal hums and clicks are completely safe. A grinding fan is best used less until repaired, since the bearing worsens with use. Repeated gas clicking with no flame is the one to stop on — don’t keep trying to light it.
Preventing it
- Seat racks properly and don’t leave loose cookware to rattle.
- Keep the fan area clear of foil and debris.
- Act on grinding early, before the bearing fails.
Frequently asked questions
Q: Why does my oven keep running after I turn it off?
A: That’s the cooling fan, and it’s normal. It runs after cooking to protect the electronics and controls from residual heat, sometimes for many minutes. It shuts off on its own once things cool down.
Q: Is a grinding noise from my oven serious?
A: It usually means a worn fan motor bearing, which won’t fix itself and gets worse. It’s not dangerous, but it’s worth servicing before the motor fails and turns into a larger repair.
Q: My gas oven clicks but won’t light — is that normal?
A: Brief clicking that ends in a flame is normal ignition. Clicking that goes on without lighting is not — it points to a weak igniter, and if you smell gas you should stop and call rather than keep trying.
Q: Why does my oven buzz during convection?
A: A soft hum is the normal convection fan. A loud buzz or rattle is not — it usually means the fan motor is struggling or a blade is catching, and it’s worth checking before the motor gives out.
Quiet it down
If a fan bearing or motor is behind the noise, we’ll test it and replace it. 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.