There are some possible reasons caused, please check below first:
Air Flow is important for cooling:
- Please make sure the intake and exhaust vents are free from obstruction.
- Make sure the projector is not enclosed or right against a wall - it needs ventilation space.
- Don’t place the projector on top of other electronic equipment, such as an AV receiver.
If the projector is being used in higher altitude you will need to turn on the “High Altitude” mode. The fan will thus operate at a higher speed to intake more air. Please check user guide to enable it.
If above steps don’t help, please contact ViewSonic service center.