Samsung · Microwave Moderate

C-A2 — Humidity Sensor Short Circuit

Humidity sensor reads as shorted. Sensor-based cycles disabled.

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

How to fix it

  1. Unplug and let the unit dry for several hours if recent steamy cooking is suspected.
  2. Inspect and reseat the humidity sensor connector.
  3. Ohm the sensor — a near-zero reading confirms a short.
  4. Replace the humidity sensor with the OEM part.
  5. Inspect harness for melted insulation; repair or replace as needed.

Why it happens

Typical signs: C-A2 displayed · Sensor Cook unavailable · Microwave otherwise runs on Time Cook

  • Shorted humidity sensor Internal sensor element failed shorted.
  • Pinched/melted sensor wire Wire chafed and shorted to chassis.
  • Moisture intrusion at sensor connector Steam wicked into the connector and bridged pins.
  • Main PCB input fault Less common.

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 humidity sensor 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-22 C-22 — Temperature Sensor Error C-A0 C-A0 — Communication Error Between Boards C-A1 C-A1 — Functional Error (Damper / Sensing)

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.