Bosch Oven Error ER1

⚡ Quick Answer: The Bosch oven error code ER1 indicates a malfunction in the temperature sensor, leading to erratic temperature readings and inconsistent cooking perf... ✅ DIY Fixable

What Does Error ER1 Mean?

The Bosch oven error code ER1 indicates a malfunction in the temperature sensor, leading to erratic temperature readings and inconsistent cooking performance. This issue can prevent the oven from heating properly, resulting in incorrect or inconsistent cooking temperatures.

Common Symptoms:

  • Oven displays ER1 on control panel
  • Oven may not heat properly or at all
  • Temperature may be inconsistent or incorrect

Possible Causes

  • Faulty or damaged temperature sensor (medium)

How to Fix Error ER1

DIY Fix Power cycle the oven

  1. Turn off the oven and disconnect it from power (switch off breaker or unplug).
  2. Wait at least 5 minutes.
  3. Reconnect power and power on the oven to see if ER1 clears.

DIY Fix Check for obvious wiring issues

  1. With power off, visually inspect accessible wiring near the oven's temperature sensor for obvious disconnections or damage.
  2. If accessible, ensure sensor connector is seated securely.

Technician Only Test and replace temperature sensor

  1. Disconnect oven from power.
  2. Access and remove the temperature sensor according to model service procedures.
  3. Measure sensor resistance with a multimeter; compare with expected specification.
  4. If out of spec, replace the sensor with OEM part.
  5. Verify correct wiring and secure connections before reassembly.

Parts needed: Temperature sensor (OEM replacement), Wiring harness/connectors (if damaged)

Technician Only Diagnose control module and wiring

  1. Inspect sensor wiring continuity and insulation.
  2. Test control board inputs for correct signal from temperature sensor.
  3. Repair damaged wiring or replace control module if sensor and wiring check good but error persists.

Parts needed: Control module (if required), Wiring harness

🛑 When to Call a Pro:
  • If you are not comfortable working with electrical appliances
  • If the oven displays additional error codes after ER1 persists
  • If there is any sign of electrical burning, smoke, or unusual smells

Technical Specifications

wattage N/A
component Temperature Sensor
resistance 1000-1100 ohms
part_number 00490153
voltage_rating 240V AC

Common Questions

What does ER1 error mean on Bosch oven?

ER1 means there's a malfunction in the temperature sensor, causing inconsistent heating.

Can I fix Bosch oven ER1 error myself?

Yes, you can try power cycling the oven and checking wiring connections.

How much does it cost to fix ER1 error?

Repair costs typically range from $40 to $150 for parts, plus labor.

When should I call a technician for ER1?

Call a technician if you're uncomfortable with electrical work or if the error persists.

Data last verified: 2026-01-16

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