Bosch Oven Error E104
⚡ Quick Answer: The Bosch oven error E104 indicates a malfunction in the temperature sensor, which may be caused by a short or open circuit in the sensor or related w... ✅ DIY Fixable
What Does Error E104 Mean?
The Bosch oven error E104 indicates a malfunction in the temperature sensor, which may be caused by a short or open circuit in the sensor or related wiring. Symptoms include the error code displayed on the control panel, the oven failing to heat properly, and the cooling fan running continuously. A power reset may temporarily clear the error, but persistent issues indicate a need for further inspection and repair.
Common Symptoms:
- Error E104 displayed on control panel
- Oven heating stops
- Cooling fan runs at high speed continuously
- Error clears temporarily after successful readings or power reset
Possible Causes
- Faulty oven temperature sensor (shorted to ground or open) (medium)
- Wiring issue between temperature sensor and control board (medium)
- Control board processing fault affecting sensor signal (low)
How to Fix Error E104
DIY Fix Basic checks and resets
- Turn off oven and isolate power at circuit breaker for several minutes to reset control electronics.
- After power removal, restore power and see if E104 clears.
- Observe oven operation: listen for fan behavior and heating attempts.
Technician Only Inspect and test temperature sensor and wiring
- Access oven sensor (usually at back of cavity).
- Visually inspect for damage, loose connectors, or burnt wires.
- Use a multimeter to measure sensor resistance.
- Repair/replace sensor or wiring harness as indicated.
- If wiring and sensor are good, test control board inputs for proper signaling.
Parts needed: Oven temperature sensor (NTC thermistor), Wiring harness, Control board (if needed)
- If you are not comfortable accessing internal components.
- If after replacing or testing sensor and wiring the error persists.
- If signs of electrical damage or burnt components are found.
Next step
Choose the next step for E104
Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.
Most relevant component to inspect
Temperature Sensor
Monitors the internal temperature to ensure correct operation and prevent overheating.
- Typical part-only price
- $15 - $35
- DIY difficulty
- Easy
- Estimated time
- 15-30 mins
Where can I find the model number?
Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.
Verify the complete model and part number on the retailer's compatibility page before ordering.
Other parts options
Check related components first; use model search as a fallback.
Wiring Harness
Connects controls, sensors, motors, and other electrical components inside the appliance.
Main Control Board
The central brain of the appliance that controls all components, cycles, and timings.
Model-compatible Oven parts
Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.
Optional routine care
Maintenance supplies
These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.
Non-Scratch Cooktop Cleaner
A routine surface-care product. Confirm that it is approved for the specific glass, ceramic, enamel, or stainless finish.
Oven Thermometer
A diagnostic aid for comparing cavity temperature during a controlled check. It does not prove which internal component has failed.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.
Technical Specifications
| wattage | |
|---|---|
| component | Temperature Sensor |
| resistance | 1-5 kΩ |
| part_number | 00420325 |
| voltage_rating | 120V AC |
Common Questions
What does E104 error mean on bosch oven?
E104 indicates a malfunction in the temperature sensor, leading to erratic heating and cooling fan issues.
Can I fix bosch oven E104 error myself?
Yes, you can try basic checks like resetting the power and observing the oven's operation.
How much does it cost to fix E104 error?
Repair costs range from $50 to $300 depending on parts and labor.
When should I call a technician for E104?
Call a technician if you're uncomfortable accessing internal components or if the error persists after your attempts.
Data last verified: 2026-07-25
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