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Samsung Refrigerators2010–present

Error Code FZ

Flex-Zone temperature sensor is broken or disconnected

Critical

Stop using immediately - risk of damage or safety issue

Also displayed as: FZ LED blinks

What This Means

Sensor wire disconnected from CN40; Thermistor resistance out of range; Bad connection at sensor

What actually causes this:

Loose wire connection or failed temperature sensor

First Thing to Check

Unplug and check if CN40 connector is fully seated

Parts Involved

Flex-Zone Temperature Sensor Thermistor

How to Fix

  1. 1

    1. Measure voltage at MAIN PCB CN40-18 to CN40-20

  2. 2

    2. Voltage should be between 4.5V and 1.0V

  3. 3

    3. Check connector seating and wire integrity

  4. 4

    4. Verify thermistor model 502AT

This Error Applies To

Samsung RF22R7351 Series Refrigerators (2010) (2010–present)

Service manual exact match: RF22R7351AAService manual exact match: RF22R7351AZService manual exact match: RF22R7351EFService manual exact match: RF22R7351EU

Related Error Codes

FZHT

Flex Zone compartment is too warm right now

IDH

Ice duct heater is not working

F

Freezer temperature sensor is broken or disconnected

EA

Outside temperature sensor is not working

IR

Ice storage room temperature sensor is not working

FLXD

Flex Zone damper heater circuit is broken

CI

Main board and compressor inverter board cannot communicate

R

Refrigerator temperature sensor is broken or disconnected

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