Why is my Target Mini showing "Temp High"?

I have a Vaporesso Target mini battery which i only use for MTL vaping. Recently it totally stopped working and wont fire up at all, just shows TEMP HIGH when i press my fire button, very frustratin - only had the device about 2 months. PLEASE HELP ME!! Vaporesso customer services is awful i have tried emailing and tweeting at them but they havent replied.