First off you may want to double check your information on the machine, we'd need a full model number and serial number to give you accurate information on this machine.
I'm going to assume it's a HD series because the standard Z model comes with a zapi controller and the onboard manager does not display codes in the same fashion you are showing, zapi codes are different.
With that said here is what i can tell you based on the HD series where i found the same code syntax

code 30016
Are you sure about this code? It does not show up in the code chart

code 30033
Main contactor fault
possible causes:
- contactor coil wiring fault
- contactor coil fault
- faulty traction controller

can you send me the Serial # please.

Thanks