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Samsung Refrigerators2018–present

Error Code 46

I/O expansion chip not communicating

Moderate

Address soon - your appliance may not work properly

Also displayed as: 46C

What This Means

I/O Expander connector not seated properly; I2C communication line damaged or shorted; I/O Expander chip defective; Main PCB defective

What actually causes this:

I/O expander chip failed or communication line is shorted

First Thing to Check

Check if certain features (like door sensor) are not responding

Parts Involved

Main PCB I/O Expander ChipI2C Communication Lines

How to Fix

  1. 1

    1. Unplug refrigerator

  2. 2

    2. Locate I/O Expander on Main PCB

  3. 3

    3. Check I2C communication lines for shorts or damage

  4. 4

    4. Reseat any connectors to I/O Expander

  5. 5

    5. Power on and verify error status

  6. 6

    6. If error persists, use oscilloscope to check I2C bus activity (SCL and SDA lines)

  7. 7

    7. If no I2C activity, replace Main PCB

This Error Applies To

Samsung RF22N9781 Series Refrigerators (2018) (2018–present)

Service manual exact match: RF22N9781Service manual exact match: RF28N9780

Related Error Codes

1

Freezer temperature sensor malfunction

6

Room temperature sensor not working

14

Ice maker temperature sensor failure

2

Fridge temperature sensor is not responding

9

Convertible zone temperature sensor failure

15

Ice storage area temperature sensor malfunction

4

Freezer defrost sensor is faulty

11

Convertible zone defrost sensor malfunction

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