How can I fix itJohn Frieda Salon Shape 1.5 Inch Hot Air Brush

In general, electric hair devices are not repairable. If faulty and under warranty, they're replaced, not repaired. Some do not have assembly hardware (snap together parts) while others do, sometimes hidden under labels or rubber feet that are removed to see screws. And some have metal as decoration, hiding screws. If you are able to disassemble this hot air brush, you must identify every part and able to use a multimeter to measure continuity of each electrical and electronic part. The On/Off switch, thermal fuse, heating element, etc. If you can determine what failed, finding replacement parts may or may not be difficult. Last, if a faulty part is replaced, careful repairs are needed to ensure safety otherwise damage may occur or electrocution from incorrect repairs.

@silvis73657 you did check the reset and the test buttons on your JFHA5R. check this guide John Frieda JFHA5R Reset and Test Buttons Replacement