It could be that the cutting unit of your nose hair trimmer is blocked by dirt or debris. This can prevent the trimmer from switching on or running properly. Clean your device by following the instructions below. 1. Switch your nose hair trimmer off. 2. Rinse the trimming head of the nose hair trimmer with hot water. 3. Switch on the trimmer and rinse the trimming head once more to remove any remaining hair. Then switch the appliance off again. 4. If rinsing the trimming head under the tap is not sufficient, immerse the trimming head in a glass with warm water for a few minutes. Do not put the handle of the trimmer in the water, as this can damage its internal machinery. 5. Carefully shake off excess water and let the trimmer air dry. For best results, clean your Philips Nose Trimmer after each use and lubricate the trimming head with a drop of sewing machine oil every six months.