Samsung · Microwave Moderate

C-22 — Temperature Sensor Error

C-22 is a temperature (cavity thermistor) sensor error — the sensor circuit is faulty (open or short). On many Samsung models the dedicated open-circuit code is E-21 and the short is E-22, so confirm which against your model; the common factor is a temperature-sensor circuit fault.

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

How to fix it

  1. Unplug the microwave.
  2. Access the cavity thermistor (top panel on most models).
  3. Reseat the thermistor connector at both ends.
  4. Measure resistance — should read ~50 kΩ near 25 °C; infinite/open = bad thermistor.
  5. Replace the thermistor with OEM part if open.
  6. If resistance is OK, repair the harness or replace the main control board.

Why it happens

Typical signs: C-22 at start of cycle · Cycle aborts immediately · No heating

  • Disconnected thermistor harness Connector vibrated loose at the sensor or main board.
  • Failed (open) thermistor Sensor element broken internally.
  • Broken wire to thermistor Often near cavity vents where wires get hot.

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.

  • Samsung microwave cavity thermistor Common replacement
    Amazon →

More Samsung microwave codes

-dr- -dr- — Door Open (Demo / Reminder) 5E 5E / SE — Touchpad Shorted (Older Spelling) C-21 C-21 — Cavity Over-Temperature C-A0 C-A0 — Communication Error Between Boards C-A1 C-A1 — Functional Error (Damper / Sensing) C-A2 C-A2 — Humidity Sensor Short Circuit

All Samsung codes → All microwave 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: samsung.com.