If the front LED is not working and the rear LED's are working then there could be a possible loose connection.
There is several reasons why this issue might occur.
If this issue is occurring, it is in need of repair, please send your vest to:
Cheetah Electronics,
Ballon,
Co. Carlow
R93 VX65
Please leave the following details with your product:
[Name] [Order Number] [Contact Details]