E02
Bosch Oven
Severity: CriticalWhat Does This Error Mean?
E02 on a Bosch oven means the cavity temperature sensor (NTC thermistor) has an open circuit — the sensor wire has broken or disconnected. With no temperature reading, the oven cannot control its heat safely and shuts down. The oven will not operate until the sensor or its wiring is repaired.
Affected Models
- Bosch HBG Series
- Bosch HBA Series
- Bosch Series 2, 4, 6 and 8 Built-In Ovens
- Bosch HBN Series
- Bosch HBS573BS0B
Common Causes
- Temperature sensor wire broken — the thin wire connecting the probe to the control board has snapped
- Sensor connector pulled loose from the control board
- Sensor probe has burnt out from years of high-heat cycling
- Previous self-clean pyrolytic cycle at extreme temperatures damaged the sensor
- Physical damage to the sensor probe — knocked or bent during cleaning
How to Fix It
-
Switch off the oven at the wall and wait 5 minutes, then power back on.
A loose connector that reconnects on its own may clear E02 temporarily. If E02 returns, the sensor or wiring has a permanent break.
-
Visually inspect the sensor probe on the back wall of the oven cavity.
Look for physical damage — a bent, cracked, or discoloured probe. A probe that has changed colour significantly (very dark or white) has likely been damaged by heat over time.
-
Check whether a pyrolytic self-clean cycle was recently run.
Pyrolytic cleaning runs the oven at extreme temperatures (up to 500 degrees C). This occasionally damages the temperature sensor — especially on older ovens where the sensor has degraded over time.
-
Call Bosch service — the sensor needs to be replaced.
This is not a DIY repair. The sensor connects to wiring behind the oven cavity wall and requires the oven to be partially removed from its housing for access.
When to Call a Professional
E02 requires a technician to test and replace the temperature sensor. Sensor replacement involves working inside the oven cavity and behind the oven panel. Contact Bosch service or a qualified appliance engineer.
Frequently Asked Questions
Can a pyrolytic clean damage my Bosch oven sensor?
Yes — pyrolytic cycles run at extremely high temperatures that can stress the temperature sensor over time. On ovens over 5 years old, it is worth having the sensor checked before running a pyrolytic clean if E-codes have appeared before. Bosch recommends not running pyrolytic cycles more than monthly for this reason.