How do I fix error code FF-DEF on my Samsung RF24R7201EU?

1. undefined: 1. Check voltage at MAIN PCB CN20-5 to CN20-7 2. undefined: 2. Expected voltage range: 4.5V to 1.0V 3. undefined: 3. Test resistance: should be 120 ohm ± 7%

Samsung RF24R7201EURefrigerator

Error Code FF-DEF

Q: What does error code FF-DEF mean on a Samsung RF24R7201EU?

Fridge defrost sensor not responding Defrost sensor wiring broken; Thermistor 502AT defrost sensor failure; Connector CN20 pin 5-7 open or shorted

Fridge defrost sensor not responding

Critical

Stop using immediately - risk of damage or safety issue

Also displayed as: LED blinks

What This Means

Defrost sensor wiring broken; Thermistor 502AT defrost sensor failure; Connector CN20 pin 5-7 open or shorted

What actually causes this:

Defrost sensor wiring damaged or sensor failure

First Thing to Check

Check for frost buildup around fridge evaporator

Parts Involved

Thermistor 502AT (Fridge Defrost)

How to Fix

1
1. Check voltage at MAIN PCB CN20-5 to CN20-7
2
2. Expected voltage range: 4.5V to 1.0V
3
3. Test resistance: should be 120 ohm ± 7%

Other Error Codes for RF24R7201EU

Freezer temperature sensor not working

OVERFLOW

Water overflowing from ice maker or water dispenser

COMP-START-FAIL

Compressor will not start

FF-TEMP-HIGH

Fridge getting too warm

COMM-MAIN-PANEL

Control panel not communicating with main board

ICE-DUCT-HEATER

Ice dispenser duct not heating

IO-EXPANDER

IO expander chip not responding

FZ-DEFROST

Freezer defrost heater not heating

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