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
- Turn off the oven and disconnect it from power (switch off breaker or unplug).
- Wait at least 5 minutes.
- Reconnect power and power on the oven to see if ER1 clears.
DIY Fix Check for obvious wiring issues
- With power off, visually inspect accessible wiring near the oven's temperature sensor for obvious disconnections or damage.
- If accessible, ensure sensor connector is seated securely.
Technician Only Test and replace temperature sensor
- Disconnect oven from power.
- Access and remove the temperature sensor according to model service procedures.
- Measure sensor resistance with a multimeter; compare with expected specification.
- If out of spec, replace the sensor with OEM part.
- 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
- Inspect sensor wiring continuity and insulation.
- Test control board inputs for correct signal from temperature sensor.
- Repair damaged wiring or replace control module if sensor and wiring check good but error persists.
Parts needed: Control module (if required), Wiring harness
- 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
Next step
Choose the next step for ER1
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.
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 | 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: 2026-07-25
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