How To Use LG Smart Diagnosis on Your Dryer

LG Smart Diagnosis is a built‑in troubleshooting tool that helps you identify problems without waiting for a service technician. By connecting your dryer to a smartphone or computer, the system can automatically run tests, read error codes, and suggest possible fixes. This guide explains the steps to activate Smart Diagnosis, interpret the results, and perform basic maintenance.

Understanding Smart Diagnosis

Smart Diagnosis works by sending diagnostic data from the dryer’s control board to an LG app. The app then compares the data with a database of known issues and displays a clear error code or recommendation. The feature is especially useful for:

When the dryer displays an error code, the app can also guide you through an Automatic Test Cycle that isolates the faulty component.

Preparing Your Dryer for Smart Diagnosis

Before you start, make sure the following conditions are met:

  1. The dryer is plugged into a grounded outlet and the power switch is turned on.
  2. All lint filters are clean and the drum is free of debris.
  3. You have a compatible smartphone or computer with the LG Smart Diagnosis app installed.

Having a clear, unobstructed area around the dryer will also help the app capture the necessary data.

Step‑by‑Step Guide to Activate Smart Diagnosis

Step 1 – Power On the Dryer

Press the Power button on the control panel. The display should light up, indicating that the dryer is ready for input.

Step 2 – Initiate Smart Diagnosis Mode

Press and hold the Temp button for three seconds. The dryer will display a flashing icon or the words “Smart Diagnosis” to confirm that the mode is active.

Step 3 – Connect to the App

Open the LG Smart Diagnosis app on your device, select “Dryer,” and follow the on‑screen instructions to pair via Wi‑Fi or Bluetooth. The app will prompt you to start the test once the connection is established.

Step 4 – Run the Automatic Test Cycle

The dryer will automatically cycle through heating, tumbling, and sensor checks. This process usually takes 2–5 minutes. Do not interrupt the cycle, as doing so may affect the accuracy of the results.

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