Samsung · Microwave Moderate

C-F2 — Touch Key / Sub-PCB Communication Error

The main control can't communicate with the touchpad sub-board, or the keypad scan returned invalid data on power up.

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

How to fix it

  1. Unplug for 5 minutes.
  2. Open the control panel and reseat the touchpad ribbon at the sub-PCB.
  3. Inspect the ribbon for kinks, tears, or corrosion.
  4. If reseating doesn't clear it, swap the touchpad first (cheaper), then the sub-PCB.
  5. Verify all keys respond after repair.

Why it happens

Typical signs: C-F2 on display at power up · Display lights but keypad is dead · Beeping then lockout

  • Disconnected/loose touchpad ribbon Ribbon between display board and touchpad not fully seated.
  • Failed touchpad Open trace in the membrane keypad.
  • Failed display / sub-PCB The board that scans the keypad has failed.

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 touchpad Common replacement
    Amazon →
  • Samsung microwave display sub-PCB 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.