Bosch Oven E3 error code
E3 means the oven temperature sensor circuit is open. The control sees an extremely high resistance (over about 5,000 ohms) — as if the sensor were disconnected — so it will not heat.
Also shown as: E3, E:3
Last updated: October 6, 2026
What causes the E3 error?
- Failed (open) oven temperature sensor
- Unplugged or loose sensor connector
- Broken wire in the sensor harness
- Corroded terminals at the sensor or board
- Sensor damaged by extreme heat
How to fix Bosch E3 — step by step
Work through these in order, from simplest and safest first. Stop as soon as the code clears.
- Power reset and cool-down
Turn off the breaker and let the oven cool fully to room temperature. Restore power and try Bake. An open circuit will return the code immediately if the sensor is truly dead. - Look at the sensor probe
With the breaker off and the oven cool, find the thin metal probe on the oven's back wall. If it is broken, blistered, or visibly damaged, it needs replacement.Safety warning: Confirm the oven is cool before touching anything inside. - Check the connector (technician)
A technician can check that the sensor plug is seated and test resistance. An open reading at room temperature confirms the sensor has failed.Safety warning: Accessing the sensor connector usually means pulling the oven out. Call a technician. - Replace the sensor
Sensor replacement is one of the simpler oven repairs. If a new sensor does not clear E3, the control board is the next suspect.Safety warning: On gas models, leave all burner-area work to a technician.
When to call a technician
- E3 returns after a reset with a cool oven
- The sensor probe looks damaged
- You need the sensor resistance tested
- It is a gas oven
Frequently asked questions
What is the difference between E3 and E4?
E3 is an open sensor circuit (infinite/high resistance). E4 is a shorted sensor (very low resistance). Both stop the oven from heating.
Can the oven run with E3?
No. The control cannot regulate temperature without the sensor, so it blocks heating entirely.
Why did E3 appear after self-clean?
Extreme self-clean heat is the hardest thing a sensor endures. Weak sensors often fail open during or right after a clean cycle.
Sources
Every meaning and fix above was checked against official manufacturer documentation:
FixCode provides general troubleshooting information only — not professional repair advice. If you are unsure about any step, stop and call a qualified technician. Repairs done incorrectly can be dangerous and may void your warranty.