It usually means an internal fault, i.e. blown fuse, H.V. fuse, door switch or a fault somewhere along the H.V. circuit.
Contact the manufacturer and ask them for a list of the error codes and what they mean. They should give them to you.
Some codes are just vague though, and you just have to spend time checking and testing everything until you find the problem.
I'm not familiar with this particular model so I can't give you a definite answer I'm affraid.
Jon, May 2007