Hi Miloslouis,
Check the static strap, some were missing and others were bolted to painted surface making them useless.
You will need "flashware" to access vehicle manager as it controls all, unlike the Cesab system.

Code 93: Communication Error
Detected By The VM
The VM has not received information
from the Operator Display.
Check power to TPA, PPA, VM and HCB, and Operator
Display. Check communication wires between VM and
Display for continuity and shorts to frame. If OK, replace
the Operator Display.
94 Code 94: Internal Fault
The VM has detected an internal fault.
Replace the VM.