A — Oven error code

Thermador E104 — Upper oven sensor short circuit (double/triple)

Complete diagnostics and troubleshooting guide for Thermador oven error code E104. Learn what it means, what causes it, and whether you need professional repair.

Severity High Repair Needs technician Components Upper oven NTC sensor, wiring

Daniel Hernandez Master Appliance Technician

Schedule repair 1-844-9023945

B — Quick facts

E104 at a glance.

Error code E104

Appliance type Oven

Severity High

Repairability Needs technician

Affected components Upper oven NTC sensor, wiring

C — Diagnosis & repair

Understanding error code E104.

Upper oven sensor short circuit (double/triple)

What Thermador E104 error means on your oven

Thermador oven error code E104 indicates: Upper oven sensor short circuit (double/triple). This is classified as a High-severity issue — schedule service promptly to prevent further damage.

What E104 means

E104 is the short-circuit counterpart to E101 — the upper oven sensor reads near zero ohms. The control board interprets this as an extremely high temperature and shuts down heating. Same sensor, opposite failure mode.

Repair

Sensor replacement. The technician measures resistance to confirm the short and replaces the sensor assembly. Schedule service.

Error E104 quick reference

Error code: E104
Appliance type: Thermador Oven
Severity: High
Repair type: Needs technician
Affected components: Upper oven NTC sensor, wiring

Troubleshooting Thermador E104 step by step

Power reset: Turn off the appliance at the circuit breaker for 5 minutes, then restore power. If E104 clears and doesn’t return, a transient electrical issue caused it.
Visual inspection: Check for obvious issues — loose connections, visible damage, water leaks, or unusual sounds from the affected components (Upper oven NTC sensor, wiring).
Document the error: Note when E104 first appeared, whether it’s constant or intermittent, and any other symptoms (sounds, smells, performance changes).
Check related systems: Error codes can sometimes be triggered by adjacent systems — verify that water supply, electrical connections, and ventilation are functioning normally.

Professional diagnosis and repair

If E104 persists after a power reset, professional diagnosis is required. Our certified Thermador technicians use factory diagnostic tools to read stored error history, test individual components (Upper oven NTC sensor, wiring), and identify the exact failure point.

Repair typically involves:

Retrieving and analyzing stored fault codes from the control board
Component-level testing of the Upper oven NTC sensor, wiring
Replacing failed components with genuine Thermador OEM parts
Verifying the repair by running a test cycle and confirming the error clears

Preventing Thermador E104 from recurring

While some component failures are age-related and unavoidable, regular maintenance reduces the likelihood of error E104 recurring:

Follow the maintenance schedule in your Thermador owner’s manual
Keep the appliance clean — debris and buildup accelerate component wear
Address minor issues early — small problems left unrepaired often trigger error codes
Use a surge protector — power fluctuations can damage electronic control boards

For complete specifications and troubleshooting documentation, visit the Thermador official site. To schedule certified Thermador oven repair, Schedule service online — we service all Thermador models in all 50 states with genuine OEM parts and a 30-day labor warranty.

Frequently asked questions about Thermador wall ovens

What is True Convection?

True Convection uses a dedicated third heating element behind the fan. Standard convection just circulates heat from the bake/broil elements with a fan. True Convection provides more even heat distribution across all racks without needing to rotate pans.

What does SoftClose mean?

Professional series wall ovens feature hydraulic hinge dampers that prevent the door from slamming. The door closes smoothly and silently from any angle. If your Professional oven door starts slamming, the hydraulic damper pistons need replacement.

How often should I self-clean?

No more than 3-4 times per year. Excessive self-clean cycles stress thermal fuses, door locks, and the oven cavity enamel coating. For routine cleaning, use baking soda paste instead.

Can I use my oven during a steam system descale?

No — the descale cycle uses the oven cavity. The process takes about 45 minutes. Plan around it. Steam ovens should be descaled quarterly (monthly in hard water areas).

What’s the advantage of a triple wall oven?

Thermador is the only brand offering three independent oven cavities. You can bake, broil, and roast at three different temperatures simultaneously — ideal for holiday cooking or entertaining.