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

  1. Turn off oven and isolate power at circuit breaker for several minutes to reset control electronics.
  2. After power removal, restore power and see if E104 clears.
  3. Observe oven operation: listen for fan behavior and heating attempts.

Technician Only Inspect and test temperature sensor and wiring

  1. Access oven sensor (usually at back of cavity).
  2. Visually inspect for damage, loose connectors, or burnt wires.
  3. Use a multimeter to measure sensor resistance.
  4. Repair/replace sensor or wiring harness as indicated.
  5. 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)

🛑 When to Call a Pro:
  • 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.

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: 2026-01-16

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