Question
No LED light up. Power to unit ok. Is ther a fuse somewher in the circut? Our little gecko population is famous for shorting out circuits.

Answer
Hey Hollis, there are no fuses in this unit. I would suggest taking out the battery, and turning off the power for about 1 minute, and then with the battery "not" installed, turn the power back on and see if you get a display. If you don't get a display, it is time to replace the controller. Good luck and have a great day.