1) The trimming element could be blocked by dirt. Soak the cutting element in a bowl of warm water with a little soap for about 2 minutes.
2) The battery could be empty, replace the battery with a new one.
3) Make sure that the + and - poles of the battery point in the right direction.
If your nose trimmer still does not work, please take it to your local Philips dealer or contact our customer care team.