This just happened on the way to work this morning - turned on the fan to the auto a/c controller to cool the truck a bit and the entire unit started to turn on and then off then on then off with about 7 seconds of on then 7 seconds of off. I thought maybe a button was sticking or something - nope. After getting home, I hooked it up to a code reader - no codes. The fuse - fine. Ideas? Suggestions? It's an '04 F150 SCREW Lariat w/~107K.

 

Try unplugging the control head to reboot it.