What does error code 46E mean on a Samsung refrigerators?

Internal I/O expander chip on Main PCB has lost communication I/O Expander chip failure on Main PCB; Communication bus fault; Main PCB defect

How do I fix error code 46E on a Samsung refrigerators?

1. undefined: Check all connectors to the Main PCB 2. undefined: Replace the Main PCB

Samsung Refrigerators2023–present

Error Code 46E

Internal I/O expander chip on Main PCB has lost communication

Critical

Stop using immediately - risk of damage or safety issue

Also displayed as: 46E

What This Means

I/O Expander chip failure on Main PCB; Communication bus fault; Main PCB defect

What actually causes this:

A component on the Main PCB has failed, specifically the I/O expander IC.

First Thing to Check

Power cycle the refrigerator — if the error returns immediately, the Main PCB requires replacement.

Parts Involved

Main PCBI/O Expander

How to Fix

1
Check all connectors to the Main PCB
2
Replace the Main PCB

This Error Applies To

Samsung RF29CB9900 Series Refrigerators (2023) (2023–present)

Service manual exact match: RF29C*Service manual exact match: RF23C*Service manual exact match: RF29CB9900QKAAService manual exact match: RF23CB9900QKAAService manual exact match: RF23CB99008MACService manual exact match: RF**CB9900*

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