What does error code IO_EXPANDER_COMM_ERROR mean on a Samsung refrigerators?

An internal chip on the main control board has failed Failed IO expander IC on Main PCB; PCB solder or trace defect

How do I fix error code IO_EXPANDER_COMM_ERROR on a Samsung refrigerators?

1. undefined: Confirm error via self-diagnosis 2. undefined: Replace Main PCB

Samsung Refrigerators2017–present

Error Code IO_EXPANDER_COMM_ERROR

An internal chip on the main control board has failed

Critical

Stop using immediately - risk of damage or safety issue

Also displayed as: Error indicated via LED

What This Means

Failed IO expander IC on Main PCB; PCB solder or trace defect

What actually causes this:

An input/output expansion chip on the main circuit board is not working, requiring board replacement.

First Thing to Check

Power-cycle the unit and re-run self-diagnostics to confirm the error persists.

Parts Involved

Main PCB

How to Fix

1
Confirm error via self-diagnosis
2
Replace Main PCB

This Error Applies To

Samsung RF23M80 Series Refrigerators (2017) (2017–present)

Service manual exact match: RF23M80*0**Service manual exact match: RF23M8090SR/AAService manual exact match: RF23M8070SR/AAService manual exact match: RF23M8070SG/AAService manual exact match: RF23M8090SG/SAService manual exact match: RF23M8080SR/EE

Related Error Codes

FRIDGE_DEF_SENSOR_ERROR

Refrigerator compartment defrost sensor is faulty

COMP_UNDER_VOLTAGE

Compressor is getting too low a voltage to run

FREEZER_DEF_SENSOR_ERROR

Freezer defrost sensor is faulty or not connected

MAIN_INVERTER_COMM_ERROR

Main board and compressor inverter board cannot communicate

FREEZER_SENSOR_ERROR

Freezer temperature sensor is faulty or disconnected

AMBIENT_SENSOR_ERROR

Outside air temperature or humidity sensor is faulty

ICE_ROOM_SENSOR_ERROR

Ice storage room temperature sensor is faulty

ICE_ROOM_FAN_ERROR

Ice storage compartment fan is not working

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