Samsung · Oven Serious

C-30 — Main PCB Internal Sensor Error

The control board's own internal temperature/diagnostic sensor is reading out of range, indicating a hardware fault on the main PCB.

Keep using it?
Limited use only
DIY difficulty
Hard
Verified against
appliancemode.com ↗

How to fix it

  1. Power-cycle the oven at the breaker for 5 minutes.
  2. If the code persists, the fix is to replace the main control board — there's no field repair of the onboard sensor.
  3. Verify ventilation around the PCB compartment before installing a new board, and check for blocked vents (see C-31) to avoid recurrence.
  4. Confirm incoming line voltage is within spec before powering up the new board.

Why it happens

Typical signs: C-30 displayed and oven won't run · Code returns after power cycle · Sometimes accompanied by C-31 · No external sensor fault found

  • Failed onboard sensor IC PCB-mounted thermistor or sensor IC failed.
  • Heat damage to the main PCB Repeated high-temp cycles cooked nearby components.
  • Surge damage Power event damaged the sensor circuit.

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 oven main control board Common replacement
    Amazon →

More Samsung oven codes

---- ---- — Invalid Temperature Setting -dC- -dC- — Flex Duo Divider Installed in Single Mode -dE- -dE- — Flex Duo Divider Not Installed bAd LinE bAd LinE — Bad Power Connection C-10 Range C-10 — Temperature Sensor Reading Error C-20 C-20 — Oven Temperature Sensor Open/Short

All Samsung codes → All oven 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: appliancemode.com.