Note: this only applies to Philips Steamers with AirStretch technology (these steamers have a grill in the head as shown in the image below).
If you have been using your stand steamer heavily for a long time, this can cause water condensation. When this happens, water will drip from the head.
To solve this, first let your steamer cool down. Then, remove the grille and press a dry cloth against the black surface to remove the condensed water.