Samsung RF28R7201SARefrigerator
Error Code RD
Fridge defrost sensor error
Critical
Stop using immediately - risk of damage or safety issue
Also displayed as: RD LED blinks
What This Means
Defrost sensor connector loose; Sensor voltage out of range 4.5V-1.0V; Broken sensor wire
What actually causes this:
Defrost sensor wire broken or heater malfunction
First Thing to Check
Check if fridge defrost heater operates during cycle
Parts Involved
Refrigerator Defrost Sensor (502AT)Refrigerator Defrost Heater
How to Fix
- 1
Check MAIN PCB CN20-5 to CN20-7 voltage 4.5V~1.0V
- 2
Measure resistance: should be 120 ohm ±7% when disconnected
Other Error Codes for RF28R7201SA
IM-FUNC
Ice maker not making ice
IO-EXP
Main board input/output chip failure
DISP-PANEL
Dispenser display not communicating
MAIN-INV
Compressor control board communication failed
ICE-ROOM-HT
Ice storage compartment heater failure
F
Freezer temperature sensor not working
RF
Fridge cooling fan malfunction
FZ-DMH
Flex zone temperature control heater failure