The water Jet is the stream of water that runs when the wire is threading. It can be adjusted so that it hits directly in the lower nozzle which is the lower wire guide.

On my alarm sheet which is an older machine than yours the 423 error says it is a wire drive failure and says it is triggered by DWC03. It also has a hand written note that says "PHONY" so evidently at some time before I owned the machine it had a problem with the DWC03 board that caused a phony wire drive error to appear.

That is about all I can help you.

Did you ever contact Larry at EDM Support. I am sure he can help you if you can't figure it out.

Thanks Gary