My forklift (GPL powered) , does not show any error, but after i turn it on it seems all normal, i can move front or backwards, do basicly anything except lifting the fork, the moment i touch the control to lift the fork it starts beeping, beeping doesnt stop unless i turn it off, and still i can do any operation except lifting.
Strangly this happens sometimes and it keeps all day, and sometimes with me doing nothing different it just works fine all day.
Jungheinrich service in Romania is very unprofessional, they tried twice troubleshooting it and no result.
Basilcy what they said was "if there is no error showing, we do not know what to do".