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

5E 5E / SE — Touchpad Shorted (Older Spelling) C-21 C-21 — Cavity Over-Temperature C-A0 C-A0 — Functional Error C-A1 C-A1 — Functional Error (Damper / Sensing) C-A2 C-A2 — Functional Error C-d0 C-d0 — Door or Key Error

All Samsung codes → All microwave codes →

Frequently asked questions

What does the C-22 code mean on a Samsung microwave?

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.

What causes the C-22 code on a Samsung microwave?

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.

Is it safe to keep using a Samsung microwave with a C-22 error?

Yes, with caution. This is rated a moderate-severity fault.

How do I fix C-22 on a Samsung microwave?

Unplug the microwave. Access the cavity thermistor (top panel on most models). Reseat the thermistor connector at both ends.

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.