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

Internal board communication chip has failed Defective Main PCB I/O expander or communication circuit; Internal Main PCB fault

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

1. undefined: Note error display on panel 2. undefined: Replace Main PCB and recheck operation

Samsung Refrigerators2023–present

Internal board communication chip has failed

Critical

Stop using immediately - risk of damage or safety issue

Also displayed as: 46E

Defective Main PCB I/O expander or communication circuit; Internal Main PCB fault

What actually causes this:

A communication chip on the main control board has stopped working — this is an internal board failure with no user-serviceable fix.

Power cycle the refrigerator once; if 46E returns immediately after restart, the Main PCB requires replacement.

Main PCB (I/O expander circuit)

Samsung RF23 Series Refrigerators (2023) (2023–present)

Service manual exact match: RF23K*Service manual exact match: RF23J*Service manual exact match: RF23J*/RF23K

Freezer defrost sensor has an open or short circuit

Fridge compartment temperature sensor is faulty or disconnected

Fridge defrost sensor is open or shorted

Freezer temperature sensor has failed or lost connection

Ambient temperature sensor has failed or is disconnected

Freezer fan motor stopped or lost feedback signal

Cool Select Room fan has stopped or lost feedback

Cool Select Room temperature sensor is disconnected or failed

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