E118 — Temperature Sensor Reading Invalid
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 'E118' is not separately documented. The 'temperature sensor reading invalid' 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 off at the breaker.
- Pull the oven and inspect the sensor harness from probe to board for melt or chafe.
- Measure PT500 resistance cold (~500 Ω) and at the cooktop with a heat gun — value should rise smoothly.
- Reseat both ends of the sensor connector.
- Replace the sensor; if E118 persists with a new sensor, replace the main control.
Why it happens
Typical signs: Intermittent shutdowns · Bake temps off by 50°F or more · Code appears, then clears for hours · Oven preheats then aborts
- Failing sensor element Resistance jumps under heat.
- Loose wiring connection Spade or plug not fully seated; vibration loosens contact.
- Heat damage to sensor lead Insulation degraded near broil element area.
- Main control input drift Failing A/D reference on the board.
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.
- Bosch oven temperature sensor (PT500) Common replacementAmazon →
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.