There are two situations that may cause the heating wire to glow red: 1) abnormal use, such as towels, clothes blocking the air outlet or stuffing the Hair Dryer into shoes, and other forms of blocking the Hair Dryer, in this case, you need to cut off the power and wait for a few minutes to ensure that the air inlet and outlet are not blocked before turning on the machine.
Dryer itself is faulty, apply for after-sales service.