by the way, this is the only documentation available on the LEV that I could find on this trouble
1. Safety Device Open
An open safety device, such as the pit or car-top stop switches, a final limit switch, or the slack chain/rope switch, will display a flashing lower case "d". The pump pressure switch on the hydraulic drive will also in the "safety device" circuit
source
http://levelevator.com/lev-error-codes