We purchased this treadmill from eBay, it worked perfect but once we got it home and plugged it in it shows up in the time display LJE1 and flashes 68 in the MPH display
Adjust the REED switch, clean it, tight the connector very well.
see the diagram
2) replace battery, clean the contacts batteries, retight the springs contacts batteries, and clean it.
Proof again. try to RUN after you did the steps before, the software diagnostic, for troubleshooting, and fix it.
God bless you
SOURCE: I didn't receive my instructional or users manuel for my Avanti AT380 Treadmill
GO THIS WEBSITE AND DOWNLOAD SIMILAR MODEL FROM AVANTI USER GUIDE:
http://www.manualsnguides.com/results.php#.TtV56Xpc71s
SINCERELY
SOURCE: When turned on right hand
If the console takesbatteries, replace them. If this does not work or your console does not requirebatteries, check the reed switch or optic sensor. Reed Switch:Unplug the treadmill and remove the motor hood cover. The reed switch is mountedon the frame next to the front roller pulley. There is a magnet glued into thefront roller pulley. When adjusting the reed switch, make sure it is pointingdirectly at the magnet. Move the tip of the reed switch within 1/8" of themagnet. Also, check to see that the wire is not damaged, and is connected tothe console. 
Try to tight the keypanel flexible cable vs Display Board and then tight the connector from display board vs Main controller board(lower board) and will be a good idea spray with contact cleaner the keypanel with carefully and patience.
Finally you will have 2 options if the problem persist: 1) display board faulty or 2) main controller board faulty. See. the block diagram how the main controller board has 90% of function in any treadmills.
you must LUBE the deck belt, front rollers and rear. This happen because the electronic system , shut down for to protect the system.
please download the owner manual for identify the REED switch. go www.fitness.manualsonline.com 
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