When the red light is flashing, it could indicate one of two things:
1. The product is equipped with an eight hour shut-off feature and once it has reached eight hours, the fan stops and the red light flashes. Switch the product to "off" and wait five seconds. You can then turn the product back on.
2. If the red light is flashing and the product has not been running for eight hours, it is likely that the fan has reached the end of its life. You will not be able to reset the product in this case.