Bosch · Oven Serious

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

How to fix it

  1. Power off at the breaker.
  2. Pull the oven and inspect the sensor harness from probe to board for melt or chafe.
  3. Measure PT500 resistance cold (~500 Ω) and at the cooktop with a heat gun — value should rise smoothly.
  4. Reseat both ends of the sensor connector.
  5. 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 replacement
    Amazon →

More Bosch oven codes

E005 E005 — Power Supply / Line Voltage Fault E011 E011 — Continuous Key Press Detected E0111 E0111 — Stuck Control Button E0511 E0511 — Cooling Fan Fault E0527 E0527 — Door Switch Fault E0531 E0531 — Convection Fan Fault

All Bosch codes → All oven codes →

Frequently asked questions

What does the E118 code mean on a Bosch oven?

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.

What causes the E118 code on a Bosch oven?

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.

Is it safe to keep using a Bosch oven with a E118 error?

Limited use only. This is rated a serious-severity fault.

How do I fix E118 on a Bosch oven?

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.

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.