John Deere 4052R Cab,, Deere 855D UTV, Z920A Zero Turn Mower and assorted implements
Not much response and I don't have an eHydro.
Suggest you call your local Deere dealer. At least he can tell you what the error code means.
BTW, you may as well look in your Operator's Manual under Troubleshooting...might be something there.
GRRRRR! I hate those Morse Code type of blinking LED's. Note to manufacturers of anything and everything using error codes; STOP WITH THE BLINKING LIGHT SEQUENCES AND JUST DISPLAY THE BLASTED ERROR CODE NUMBER!