Tip for the future with Linde trucks is, post up the start of the serial number to pin point the series & year.
From the info already provided its either going to be a H2X 392 or a 393, the letter after the 3 digit series number gives the year of manufacture, year is also on the data plate.
L = a lift fault ( smart these German's )
L222 = Joystick for more than 2 sec not in neutral position after Power On.
If it has a key switch fitted, check the contacts & switch, sounds like its very briefly powering down & back up again which in turn throws the error code.
Check the hydraulic joystick's & the wiring to them would be a good place to start.
If you have the 4 way joysticks fitted also check the rubber cover with the symbols on hasn't come loose from the console as this can stop the joystick returning to neutral position.
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