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Hi, I made a mistake, sorry. It is not a 423 Greyscale etc.. that I own but a Xerox Workcentre pro 420 black and white photocopier. I have but no manual to find out how or if it has a 'mirror' or 'inverse' function. Thanks
The most common explanation for the error 'U4-2' in all the 'Xerox' machines is "Fuser warm up failure occurred". I am very sorry that such a problem has occured for you. It cannot be solved by you, if you are not a qualified technician and without proper tools.
Please do call the nearest service centre for a visit and they will probably solve it in a day. Remember, they need the service manual procedures for solving it properly.
Don't worry, it is a very common problem. But only authorised service people can help you in a good way.