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Error code reference

LG Dryer Error Code AC

Electronic control problem (Invalid Communication).

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What the AC error code actually means

The AC error means your LG dryer's main control board is having trouble communicating with other parts inside the machine, so it stopped working to avoid causing further damage. This is usually caused by a loose wire connection or a faulty control board. A technician will need to inspect the internal wiring and possibly replace the control board to get your dryer running again.

Diagnostic procedure

The full AC procedure

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1
First diagnostic step
First check the PCB and wire harness. Replace the PCB if the problem persists.
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Most common causes of AC

Ranked by how often they cause this code
  1. 1Loose or Disconnected Wire Harness Connector
  2. 2Damaged Wire Harness
  3. 3Corroded or Contaminated Connectors
  4. 4Failed Main PCB

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Questions people ask about AC

What does AC mean on a LG dryer?
The AC error code on an LG dryer indicates an electronic control problem involving invalid communication. This means the main PCB is not properly exchanging data signals with other components in the dryer. The dryer will stop operating when this code appears. The fault typically originates in the wire harness or the control board itself.
Will resetting my LG dryer clear the AC error code?
A reset, performed by unplugging the dryer for several minutes and then restoring power, may temporarily clear the AC code. However, if the underlying cause is a damaged wire harness or a failing PCB, the error will return once the dryer attempts to operate. A reset is useful for ruling out a temporary glitch but is not a permanent fix for a hardware fault.
How much does it cost to repair an LG dryer AC error code?
Repair costs depend on whether the fix requires a new PCB or just harness work. Wire harness repairs or connector replacements are generally on the lower end, potentially ranging from around $50 to $150 in parts and labor. A full PCB replacement on an LG dryer typically runs between $150 and $350 depending on the specific model and labor rates in your area.
Can I fix the AC error on my LG dryer myself?
Some steps are approachable for a confident DIYer. You can start by unplugging the dryer, then checking that all wire harness connectors visible near the control board are firmly seated and free of corrosion. If connections look good and the error persists, replacing the PCB is the next step, which is more involved and may be better handled by a technician.
Is it safe to use my LG dryer when the AC error code is showing?
You should not continue using the dryer while the AC error is active. The code indicates a communication failure in the electronic control system, and operating the dryer with a compromised control board could lead to unpredictable behavior or secondary damage. It is best to leave the dryer unplugged until the fault is diagnosed and repaired.

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