21EInfo
Samsung Refrigerator 21E Error Code
The ambient sensor (usually on the control board) is reading abnormally, affecting temperature regulation.
Common causes
- Sensor failure
- Loose connection on control board
- Control board fault
How to fix it
- Locate the ambient sensor (may be near the display) and check its resistance.
- Reseat the sensor connector on the main board.
- If resistor value is out of spec, replace sensor.
⚠ When to call a pro: If sensor tests fine, the control board may need replacement.
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Always unplug the appliance (and turn off the water for washers/dishwashers) before inspecting. These guides are for information only and are not a substitute for a professional repair.