E101 — Cavity Temperature Sensor (PT500) Fault
Bosch's official US oven/microwave error-code page documents only E11 (touch keys/condensation) plus generic 'E and a number' catch-alls that instruct disconnecting power and calling Bosch support. A specific 'E101' is not separately documented. The 'cavity temperature sensor (PT500) fault' explanation below is not confirmed on Bosch's US consumer page — verify against your model's manual.
- Keep using it?
- Limited use only
- DIY difficulty
- Moderate
- Verified against
- bosch-home.com ↗
How to fix it
- Power the oven off at the breaker for safety.
- Pull the oven enough to access the rear, or remove the back panel.
- Unplug the temperature sensor lead and measure resistance — a PT500 should read ~500 Ω at room temp, climbing with heat.
- Inspect the sensor wire from probe to plug for chafing or melt damage.
- Reseat the sensor connector at the main control board.
- Replace the sensor if resistance is open/shorted; replace the control board only if a known-good sensor still throws E101.
Why it happens
Typical signs: Oven heats then shuts off mid-bake · Temperature appears wrong (very low or very high) · Self-clean refuses to start · E101 displayed during preheat
- Failed PT500 sensor Element open or out of resistance spec.
- Broken or pinched sensor wire Lead damaged where it exits the cavity wall.
- Loose connector at control board Sensor plug backed out from vibration or service.
- Control board input fault Bad A/D channel on the main control.
Parts you may need
If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.
More Bosch oven codes
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: bosch-home.com.