Editorial & technical review
- Written by ApplianceWorth Editorial Team
- Technically reviewed by Victor — appliance technician
- Last reviewed 2026-07-01
- Applies to Samsung refrigerators
- Confidence medium
- Also displayed as 21C
- Sources Manufacturer service documentation and field-repair experience · Methodology · Report a correction
What this code means
The main control is not receiving the expected feedback from the freezer evaporator fan. Ice buildup can stop the fan even when the motor itself is still functional.
Most likely causes
- Frost or ice is blocking the fan blade
- The freezer fan motor has failed
- A door-seal or defrost problem caused recurring ice buildup
- The fan harness or main control is faulty
Safe checks for the owner
- Check whether freezer temperature is rising and protect food as needed.
- Listen for scraping, buzzing or an absent fan sound.
- Inspect door gaskets and make sure packages are not preventing the door from closing.
Estimated U.S. repair cost
$260–$520, depending on model, access, parts availability and local labor.