LG Washer Error Code 1AC4

The 1AC4 code means the main control board (main PB) is not receiving communication signals from the WiFi module on the upper washer unit. This is classified as a communication error and typically points to a wiring or connector issue between these two components. The fault can also be caused by a defective WiFi module or, less commonly, a problem with the main PB itself.

The 1AC4 code relates to the WiFi communication circuit rather than core wash system components like the motor, pump, or water valves. Basic washing functions may continue to operate normally. However, you should confirm the machine is completing full cycles correctly before relying on it for regular use, and address the fault to prevent potential secondary issues.

If the fix is simply reseating a loose connector, there may be no parts cost involved, though a service call to diagnose the issue typically runs between $75 and $150. If the WiFi module needs replacement, parts and labor combined can range from $150 to $350 depending on the specific model and labor rates in your area. Main board replacement, if required, is generally the most expensive repair at $250 to $500 or more.

In many cases, yes. The first step is to check the wiring connector between the WiFi module and the main PB for loose, corroded, or damaged pins. Disconnecting and firmly reseating the connector often resolves the issue. If the connector is secure and the error persists, the repair moves into component replacement territory, which may require a technician.

A power reset may temporarily clear the code if the communication failure was caused by a momentary glitch, but the error will return if the underlying connector or component fault is not corrected. To permanently resolve it, the physical connection between the WiFi module and the main PB needs to be inspected and repaired or the faulty component replaced.