There is a little clip that holds the head in the home position. If that clip gets bent so the head cant go all the way to the home position, it will give you an error. Pull the cover off and put a wedge in the cover limit switch. Adjust the clip so that it will hold the head in the home position(bend it up or down very carefully.). Test it several times before reassembling.
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OK, so this may become a problem in some future time. It is something you should be at least aware of.