C-21 Convection fan motor error

moderate

The Samsung C-21 error code on your oven indicates: Convection fan motor error. This typically requires troubleshooting the fan motor system.

Samsung Oven Affects 2 models

What Causes Error C-21

high likelihood #1

Fan motor failure

The motor has worn out or burned out and can no longer spin.

high likelihood #2

Ice or debris blocking fan blades

Frost buildup or foreign objects are preventing the fan from rotating.

medium likelihood #3

Wiring connection issue

The connector between the fan motor and control board is loose or damaged.

low likelihood #4

Control board not sending power

The PCB relay controlling the fan has failed.

How to Fix Error C-21

  1. Step 1: Power cycle the appliance

    Unplug for 5 minutes and plug back in. A temporary glitch may have triggered the error.

  2. Step 2: Listen for the fan

    After plugging back in, listen near the fan location. If you hear grinding, clicking, or nothing at all, the motor or blades have an issue.

  3. Step 3: Check for ice buildup

    Open the panel covering the fan (usually the back wall inside the compartment). If you see ice around the blades, defrost manually using a hair dryer on low.

    ⚠️ Never use sharp objects to chip ice — you can puncture refrigerant lines.

  4. Step 4: Spin the fan by hand

    With the appliance unplugged, try rotating the fan blade. It should spin freely with slight resistance. If it's stiff or locked, the motor bearings are seized.

  5. Step 5: Check wiring

    Disconnect and firmly reseat the fan motor connector at both the motor and the control board ends.

  6. Step 6: Replace the fan motor

    If the motor is confirmed bad, order a replacement for your model. Most fan motors are held by 2-4 screws and a single wire connector.

Parts You Might Need

If troubleshooting doesn't resolve error C-21, you may need to replace one of these parts:

Convection Fan Motor

motor $40-$90
Find on Amazon PartSelect

Cooling Fan Motor

motor $30-$70
Find on Amazon PartSelect

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When to Call a Professional

If the fan motor has been replaced but the error returns, or if you notice the compressor is also not running

  • Repeated fan failures can indicate a control board issue
  • Combined fan + compressor failures suggest electrical problems
  • Accessing some fan assemblies requires removing sealed panels

Video Repair Guides

Watch a repair walkthrough for this error code on YouTube:

▶ Search YouTube for "Samsung oven error C-21 fix"

Models Affected

This error code has been reported on the following Samsung oven models:

NE59M6850SSNE63A6511SS