How do I fix error code FF-DEF on a Samsung refrigerators?

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 Refrigerators2010–present

Error Code FF-DEF

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

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%

This Error Applies To

Samsung RF24R7201 Series Refrigerators (2010) (2010–present)

Service manual exact match: RF24R7201AAService manual exact match: RF24R7201EGService manual exact match: RF24R7201SAService manual exact match: RF24R7201EOService manual exact match: RF24R7201APService manual exact match: RF24R7201EUService manual exact match: RF24R7201EFService manual exact match: RF24R7201FA

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