Samsung Washer Error Code AC6 — Inverter Communication Error
What this means
The AC6 error code indicates a communication failure between the main PCB and the inverter board that controls the direct-drive motor. The inverter converts DC power to the variable-frequency AC needed to spin the motor at different speeds for wash, rinse, and spin. When communication is lost, the washer cannot control the motor and will stop the cycle.
Alternate codes: AC
Step-by-step fix
4 stepsPower cycle the washer
Unplug for 5 minutes and restart. A communication glitch from a power surge or static can sometimes trigger this code once.
If the code returns immediately, proceed to inspection.
Inspect the wiring between boards
Unplug the washer. Remove the rear panel to access the main control board and the inverter board (usually at the bottom or behind the drum). Check the wire harness connecting them for damage, loose connections, or corrosion.
Reseat every connector on both boards firmly. A marginal connection can work intermittently.
Check the inverter board for damage
Visually inspect the inverter board for burned components, bulging capacitors, or blackened areas. These indicate the board has failed.
A burned smell from the inverter board area is a strong indicator of failure.
Replace the inverter board if damaged
If the inverter board shows visible damage, replace it. Disconnect all wire harnesses, remove mounting screws, and install the new board. Reconnect everything and test.
After replacing the inverter, run the washer through a complete cycle to verify all speeds (wash, rinse, spin) work correctly.
When to call a professional
If both boards look good and wiring is intact, one of the boards has an internal fault that requires bench testing. A technician can determine which board to replace.
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
Learn more about our sourcesParts you may need
Inverter Control Board
Part #DC92-01378A · $80–$180
If inverter board shows visible damage
Main Control Board
Part #DC92-01021B · $120–$250
If inverter board is good but communication still fails
Links may earn us a commission at no extra cost to you. We only recommend parts relevant to this repair.