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ErrBase

Samsung Washer AC6 Error Code: Motor Communication Fault

Quick Answer

AC6 means the main control board and the inverter board are not communicating over the internal communication bus. This prevents the motor from receiving drive commands. Start by checking the wiring harness between the two boards, as connector corrosion and loose pins are the most common cause.

AC6 means the main control board and the inverter board are not communicating over the internal communication bus. This prevents the motor from receiving drive commands. Start by checking the wiring harness between the two boards, as connector corrosion and loose pins are the most common cause. If the harness is intact, one of the two boards has failed and must be replaced.

SamsungWasherSeverity: highDifficulty: advanced78% DIY Success
Time to Fix
45–120 min
Difficulty
advanced
Parts Cost
$180 – $350
Tools Needed
Phillips screwdriver, Torx T20 screwdriver

What Does the AC6 Code Mean?

AC6 is a board-to-board communication failure. The inverter board (motor drive) and the main control board communicate over a serial bus. When that signal is lost, AC6 fires and the machine will not run any cycle.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Wiring harness connector loose or corroded between main and inverter boards40%
Inverter board (PCB) failed24%
Power surge damaging one or both boards22%
Main control board communication circuit failed14%

Symptoms You May Notice

  • AC6 code immediately at power-on or cycle start
  • Machine will not start any cycle
  • Machine worked previously and AC6 appeared suddenly after a power event

Can you reset a Samsung washer to clear the AC6 code?

Unplug for 60 seconds after any repair. AC6 will not clear on a power reset alone if the communication bus fault is still present.

Tools Required for Diagnosis

Phillips screwdriverTorx T20 screwdriverElectronics contact cleaner

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

1

Unplug the washer and wait 5 minutes

Unplug the washer and wait 5 minutes. Access the control board area (rear or top panel). Locate the communication wiring harness running between the main control board and the inverter board.

2

Disconnect and reseat both ends of the communication harness

3

If AC6 persists after reseating

4

Replace the main control board DC92-01671A if the inverter board

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name
PCB Inverter AssemblyDC92-01803A · $200–$350
Main Control BoardDC92-01671A · $180–$320

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs
Labor Approach
Our Verdict
BORDERLINE
Estimated Cost: $265 (Parts) vs $750 (New Machine)

Frequently Asked Questions

What is the difference between the main control board and the inverter board on a Samsung washer?
The main control board is the primary logic board that manages the entire wash cycle, user inputs, and sensor data. The inverter board (also called the motor drive board) specifically converts household AC power into the variable-frequency DC power that drives the brushless motor. Both boards are required for operation.
Can I replace just the inverter board without replacing the main board?
Yes. In most AC6 cases, only one board has failed. Start with the inverter board as it fails more frequently. If AC6 clears after replacing the inverter board, the main board did not need replacement.

Related Samsung Washer Error Codes

Code: 3ESamsung Washer 3E Error Code: Motor FaultCode: 9C8Samsung Washer 9C8 Error Code: Power Frequency FaultCode: 9C2Samsung Washer 9C2 Error Code: Low Supply Voltage Fault

Same Fix Works on These Brands

Samsung shares the same hardware platform with these brands. The diagnosis and repair steps are identical.

Samsung washerSamsung Washer 3C2 Error Code: Motor StallSamsung washerSamsung Washer 3E Error Code: Motor FaultSamsung washerSamsung Washer 4C Error Code: No Water SupplySamsung washerSamsung Washer 4E Error Code: Water Supply Fault (Top Load)Samsung washerSamsung Washer 5C Error Code: Drain Error (Older Display)Samsung washerSamsung Washer 8C Error Code: Vibration Sensor Fault

Models Known to Experience AC6 Errors

This repair applies to most Samsung washers with this error code. Common model numbers include:

WF45R6100AW, WF45T6000AW, WF45R6300AW, WF50R8500AV, WF45H5200AW

Last verified for technical accuracy on March 14, 2026