What does error code IO-EXPANDER-COMM-ERROR mean on a Samsung refrigerators?

A communication chip on the main control board has failed Failed IO expander IC on Main PCB; PCB damage or bad solder joint

How do I fix error code IO-EXPANDER-COMM-ERROR on a Samsung refrigerators?

1. undefined: Inspect Main PCB for visible damage or burnt components 2. undefined: Replace Main PCB

Samsung Refrigerators2020–present

Error Code IO-EXPANDER-COMM-ERROR

A communication chip on the main control board has failed

Moderate

Address soon - your appliance may not work properly

Also displayed as: F and R blink (IO expander communication error — item 45 in self-diagnosis list)

What This Means

Failed IO expander IC on Main PCB; PCB damage or bad solder joint

What actually causes this:

An internal chip on the main circuit board has stopped working — the refrigerator needs a new main board.

First Thing to Check

Power cycle the refrigerator — unplug for 30 seconds.

Parts Involved

Main PCB

How to Fix

1
Inspect Main PCB for visible damage or burnt components
2
Replace Main PCB

This Error Applies To

Samsung RF28T5 Series Refrigerators (2020) (2020–present)

Service manual exact match: RF28T5101SR/AAService manual exact match: RF28T5A01S9/APService manual exact match: RF28T5021S9/EMService manual exact match: RF28T5001S9/MLService manual exact match: RF28T5021B1/COService manual exact match: RF28T5A01SR/AAService manual exact match: RF28T5021SR/AAService manual exact match: RF28T5001SR/AA