Samsung Washer Error Code 1AC

The 1AC code on a Samsung washer indicates a communication error between the sub PBA and the main PBA on the upper washer unit. These two control boards exchange signals to coordinate all washer functions, and when that communication is lost, the machine stops and displays this fault. The error is most often caused by a loose connector, a corroded wiring harness connection, or a failed control board.

No, you should not continue running the washer while the 1AC error is active. The error indicates that the two main control boards cannot communicate, which means the machine cannot reliably control its own functions. Running a washer in this state could lead to further component damage or unpredictable operation.

Repair costs vary depending on the root cause. If the fix is simply reseating a loose connector, there may be no parts cost at all, though a service call can run anywhere from $75 to $150 or more. Replacing a sub PBA or main PBA typically adds $150 to $400 or more in parts, depending on the specific board, plus labor if a technician performs the work.

In many cases, yes. Start by unplugging the washer and inspecting the wiring connectors between the sub and main PBAs for looseness, corrosion, or damaged pins. Firmly reseating connectors and checking the harness for physical damage are straightforward tasks for a confident DIYer. If the connectors and wiring appear fine, replacing a control board is more involved and may require a technician.

A power reset, done by unplugging the washer for a few minutes and plugging it back in, may temporarily clear the code if the communication fault was caused by a transient signal issue. However, if the underlying cause is a loose connector, corroded pin, damaged harness, or failed board, the error will return. A reset alone is not a repair.