Your LG Washer/Dryer Combo Unit has a slight difference in how it is designed to dry compared to a standard dryer.
Most Combo Units will automatically run a spin cycle before the DRY cycle begins. This is important because the washer will attempt to extract as much water as possible from the clothing before it begins to dry. This process may add an additional 14 minutes to the cycle any time the dry setting is chosen.
To perform a DRY ONLY cycle:
Press the POWER button to turn on the washer.
Press the DRY button until the desired dry level or time is selected.
Press the START/PAUSE button to begin the cycle.