C-22 Moderate Moderate DIY

Samsung Microwave C-22 — Cavity Thermistor Open

Samsung Microwave · Error code C-22

What C-22 Means

The cavity (oven) thermistor circuit reads open. The control cannot monitor cavity temperature, so it disables cook cycles.

Symptoms

  • C-22 at start of cycle
  • Cycle aborts immediately
  • No heating

Common Causes

1
Disconnected thermistor harness

Connector vibrated loose at the sensor or main board.

2
Failed (open) thermistor

Sensor element broken internally.

3
Broken wire to thermistor

Often near cavity vents where wires get hot.

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.

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.

Common replacement Samsung microwave cavity thermistor View on 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 — Humidity Sensor Open Circuit C-A2 C-A2 — Humidity Sensor Short Circuit

All Samsung codes → All microwave codes →

Verified against manufacturer documentation: samsung.com

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