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Error code reference

LG Dryer Error Code AE4

A communication error between the WIFI PBA and the MAIN PBA.

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What the AE4 error code actually means

Your LG dryer is having trouble communicating with your home Wi-Fi network through its internal smart board. This could be caused by a loose internal wire, or simply because the dryer's stored Wi-Fi name or password no longer matches your router's settings. Smart features like app control may not work until the issue is resolved, but the dryer's basic drying functions are typically unaffected.

Diagnostic procedure

The full AE4 procedure

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1
First diagnostic step
Check wire harness between the Sub PBA and the Wi-Fi module; make sure that the SSID stored in the Wi-Fi module and your wireless router matched, the password is accessible within the range.
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Most common causes of AE4

Ranked by how often they cause this code
  1. 1Loose or damaged wire harness
  2. 2SSID mismatch
  3. 3Incorrect or changed Wi-Fi password
  4. 4Dryer out of router signal range
  5. 5Faulty Wi-Fi PBA or Main PBA

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Questions people ask about AE4

What does AE4 mean on a LG dryer?
The AE4 code signals a communication error between the Wi-Fi PBA and the Main PBA inside your LG dryer. It means the two boards are not successfully exchanging data, which disrupts the dryer's smart connectivity features. The cause can be a wiring issue inside the dryer or a mismatch between the stored network credentials and your actual router settings.
Is it safe to use my LG dryer when it shows the AE4 error?
Yes, the AE4 error is a connectivity fault related to the Wi-Fi communication boards and does not affect the dryer's core heating or motor functions. Your dryer should still be able to run drying cycles normally. However, smart features controlled through the LG ThinQ app will not function until the error is resolved.
How much does it cost to repair an AE4 error on an LG dryer?
If the fix is simply re-pairing the dryer to your Wi-Fi network or reseating a loose wire harness connector, there is no parts cost involved. If a Wi-Fi PBA or Main PBA needs to be replaced, parts typically range from roughly $50 to $200 or more depending on the model, plus labor costs if a technician performs the repair. Getting a diagnostic visit from a qualified technician can help confirm whether a board replacement is actually needed before purchasing parts.
How do I fix the AE4 error on my LG dryer?
Start by checking the wire harness between the Sub PBA and the Wi-Fi module for loose or damaged connections and reseat any unplugged connectors. Next, verify that the SSID and password stored in the dryer's Wi-Fi module match your current router settings exactly, and confirm the dryer is within reliable range of the router. If the harness and network settings are both correct and the error remains, one of the communication boards may need to be replaced.
Will resetting my LG dryer clear the AE4 error code?
A power reset, done by unplugging the dryer for a few minutes and plugging it back in, may temporarily clear the AE4 code, but it will likely return if the underlying cause is not addressed. If the error is due to a wiring issue or a persistent network mismatch, the fault will reappear after the dryer attempts to reconnect. Correcting the harness connection or re-pairing the dryer to your Wi-Fi network is necessary for a lasting fix.

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