I am just setting up my Zilla Z1K (Elithion BMS and Thundersky batteries).
Everything seems okay when I first start the car - the contactors close - when I press the HEPI pedal the motor starts turning (car is jacked up on all 4 wheels until I am comfortable).
After a short period (anywhere from 2 sec to 10 sec) the Zilla Error Light comes on, with a 1133 error (Lost Communication with controller during use, either direction).
I tried replacing the ethernet cable between the Hairball and the controller (it also has a choke around it) - even tried a new cable in a metal sheath/grounded conduit) with no difference.
The Zilla directly controls the positive contactor (with a diode as per the manual) - the Elithion BMS has a FLT output which is normally grounded - this controls the ground side of the +Ve contactor relay).