How do I fix error code FZ-DEF on my Samsung RF24R7201SA?

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 RF24R7201SARefrigerator

Error Code FZ-DEF

Q: What does error code FZ-DEF mean on a Samsung RF24R7201SA?

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%

Other Error Codes for RF24R7201SA

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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