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

1. undefined: 1. Check voltage at MAIN PCB CN20-6 to CN20-8 2. undefined: 2. Expected voltage range: 4.5V to 1.0V 3. undefined: 3. Test resistance between pins: should be 63 ohm ± 7%

Samsung Refrigerators2010–present

Error Code FZ-DEF

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

Freezer defrost sensor not responding Defrost sensor wiring broken; Thermistor 502AT defrost sensor failure; Connector CN20 pin 6-8 open or shorted

Freezer 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 6-8 open or shorted

What actually causes this:

Defrost sensor wiring damaged or sensor failure

First Thing to Check

Check for ice buildup around evaporator that might indicate sensor freeze

Parts Involved

Thermistor 502AT (Freezer Defrost)

How to Fix

1
1. Check voltage at MAIN PCB CN20-6 to CN20-8
2
2. Expected voltage range: 4.5V to 1.0V
3
3. Test resistance between pins: should be 63 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

Related Error Codes

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ICE-ROOM

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FZ-DEFROST

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ICE-ROOM-FAN

Ice room fan not running

COMM-DISPENSER

Water/ice dispenser panel not communicating

Fridge temperature sensor not working

FZ-ROOM

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