Bosch · Washer Moderate

E12 — Temperature Sensor (NTC) Fault

Bosch's official US washer codes use an E:XX / F-code / icon format; a bare 'E12' is not in the official US list. The 'temperature sensor (NTC) fault' explanation below is not confirmed on Bosch's US consumer page — verify against your model's manual.

Keep using it?
Yes, with caution
DIY difficulty
Moderate
Verified against
bosch-home.com ↗

How to fix it

  1. Unplug the washer and access the heating element area.
  2. Locate the NTC (usually built into or beside the heater flange).
  3. Disconnect and measure resistance at room temperature (~10k ohms is typical).
  4. Replace the NTC if reading is open, shorted, or wildly off.
  5. Inspect the wiring back to the control board; repair as needed.
  6. Restore power and run a hot cycle to verify.

Why it happens

Typical signs: Hot wash not heating · Cycle aborts after fill · Long wash times · Cold water on all temperature settings

  • NTC sensor failure Thermistor element broken, reads open or shorted.
  • Wiring break to NTC Lead between sensor and main board damaged.
  • Corroded NTC connector Moisture in connector raises resistance.
  • Heating element NTC integrated unit failed On models where NTC clips into the heater body.

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.

  • NTC temperature sensor Common replacement
    Amazon →

More Bosch washer codes

E01 E01 — Door Lock Fault E02 E02 — Motor Fault E03 E03 — Door Lock Fault E04 E04 — Water Inlet Fault E05 E05 — Heating Element Fault E06 E06 — Door Lock Circuit Fault

All Bosch codes → All washer 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.