How do I fix error code AC on a Samsung washers?

1. undefined: 1. Check the wire connections and terminal contacts between the sub and main PBAs 2. undefined: 2. Check for disconnected wires 3. undefined: 3. Check whether the sub PBA is short-circuited because of moisture 4. undefined: 4. Remove the sub PBA C/Panel and check for any faulty soldering 5. undefined: 5. If the main PBA's communication circuit is faulty, replace it

Samsung Washers2024–present

Error Code AC

The control panel and the main computer board are not talking to each other

Moderate

Address soon - your appliance may not work properly

Also displayed as: AC

What This Means

Communication error between sub PBA and main PBA; Incorrect or loose wire connections between sub and main PBAs; Faulty soldering on sub PBA C/Panel; Moisture or short-circuit on sub PBA

What actually causes this:

A wire connection between the control panel and the main board came loose

First Thing to Check

Unplug the washer for 60 seconds and plug it back in — if the error returns, it needs service

Parts Involved

Sub PBAMain PBAWire Harness

How to Fix

1
1. Check the wire connections and terminal contacts between the sub and main PBAs
2
2. Check for disconnected wires
3
3. Check whether the sub PBA is short-circuited because of moisture
4
4. Remove the sub PBA C/Panel and check for any faulty soldering
5
5. If the main PBA's communication circuit is faulty, replace it

Parts Commonly Needed for This Error

OEM part numbers confirmed by retailers

This Error Applies To

Samsung WF45A6400A Series Washers (2024) (2024–present)

Service manual exact match: WF45A6400AV/USService manual exact match: WF45A6400AW/USService manual exact match: WF45A6400AC/USService manual exact match: WF22C6400AV/AXService manual exact match: WF22C6400AW/AXService manual exact match: WF22C6400AP/CO