What does error code 46C mean on a Samsung RF22K938AA?

I/O Expander is not responding to main board I/O Expander failure; Main PCB malfunction; Cable connection problem

How do I fix error code 46C on my Samsung RF22K938AA?

1. undefined: Check I/O Expander connector 2. undefined: Verify cable connections 3. undefined: Test I/O communication signals

I/O Expander is not responding to main board

Critical

Stop using immediately - risk of damage or safety issue

Also displayed as: 46C

I/O Expander failure; Main PCB malfunction; Cable connection problem

What actually causes this:

Main PCB failure or communication line break

Check if all connectors to main PCB are attached

Main PCB

Freezer defrost sensor is not responding

Ice duct heater not working properly

Cool Select Room defrost sensor error

Fridge humidity sensor not responding

Ice bucket heater is malfunctioning

Ice maker temperature sensor failed

Ice maker is not making or dispensing ice

Freezer is too warm

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