After a year of fighting it I think I found it... The connection to the controller (Right side/Looking from top) on the bottom not always making connection. Removed molex connector from controller sprayed with contact cleaner (Let dry) and pushed back on. It started working immediately. If Yale didn't make it so hard to get manuals for the machines this would be easy. I love companies that make it hard to maintain your equipment. A few simple manuals, schematics, & part numbers is all you need.