The power light of Pineapple Jun Fascia Gun Pro3 is on, but the reason why the indicator light is not on is the indicator light failure, power adapter problem, or battery problem.

1. Indicator light failure: The indicator light of the Pineapple Jun Fascia Gun Pro3 may malfunction and the indicator light needs to be replaced.

2. Power adapter problem: There may be a problem with the power adapter of the Pineapple Jun Fascial Gun Pro3, causing the indicator light to not work properly. You can try a new power adapter.

3. Battery problem: The battery of Pineapple Jun Fascial Gun Pro3 may be damaged and needs to be replaced with a new one.