If you notice your range hood dripping water, there are a few potential causes. First, check to see if the drip is coming from the ventilating fan or from the condensation pan. If it's coming from the fan, it's likely due to a build-up of grease and grime on the blades. This can happen if you don't regularly clean your range hood. To clean it, simply remove the greasy buildup with a damp cloth or sponge.
If the drip is coming from the condensation pan, it could be because of a clogged drain line. The pan collects water that condenses when cooking, and this water drains through a small hole in the bottom of the pan. If this hole becomes clogged, water will start to back up and eventually overflow into your kitchen. To fix this, simply unclog the drain line with a plunger or snake.