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
How to Fix
- 1
Inspect Main PCB for visible damage or burnt components
- 2
Replace Main PCB
Other Error Codes for RF28T5001S9
Refrigerator compartment temperature sensor is disconnected or dead
Internal humidity sensor has failed or is disconnected
Defrost sensor on freezer evaporator is failed or disconnected
Freezer fan motor is not running or not sending feedback
Supply voltage to compressor is too high
Freezer temperature sensor is failing or disconnected
Ice maker temperature sensor in freezer is failed or unplugged
External room temperature sensor is failed or disconnected