first welcome to the world of Lippert Jacks!! lol....well, find your controller- usually first bay behind driver side near the slide controller but separate...unplug....wait about a minute and re plug.then turn on generator....then engine then engage break...if i you turn on at keypad and powers up and you don't have an error, look in the owners manual for calibration to level- there is a sequence of buttons to push on the pad to set it back to square-BUT- and this is big---you MUST be almost already perfectly level.........if after you have unplugged the controller though and you have an error, you have another issue. AND check your ground wire to it- ours was not connected and service said it actually just scrambled the controller after 3 tries so they replaced it. Works perfect now....also, if you call lippert Cust Service they are VERY helpful as far as tracing down and telling you over the phone-just have your portable phone in hand as you run around the coach with him!!