Error Code FD
Freezer defrost cycle sensor malfunction
Critical
Stop using immediately - risk of damage or safety issue
Also displayed as: FD LED blinks
What This Means
Defrost sensor connector loose; Sensor voltage out of range 4.5V-1.0V; Broken sensor wire or thermistor
What actually causes this:
Defrost sensor or heater circuit problem preventing frost from melting
First Thing to Check
Check if defrost heater is operating during defrost cycle
Parts Involved
How to Fix
- 1
Check MAIN PCB CN20-6 to CN20-8 voltage 4.5V~1.0V
- 2
Measure resistance: should be 63 ohm ±7% when disconnected
This Error Applies To
Samsung RF28R7201 Series Refrigerators (2010) (2010–present)
Related Error Codes
Fridge cooling fan malfunction
Flex zone temperature control heater failure
Ice room fan not operating
Ice maker not making ice
Main board input/output chip failure
Dispenser display not communicating
Compressor control board communication failed
Ice storage compartment heater failure