I think it is trying to calibrate the bill validator and the sensors are not with in guidelines. Try opening the bill path and cleaning all the sensors. If that does not work depending on which validator you have you might be able to do a calibration with a blank peice of paper.
Just had this one this morning. Error, Error Out of Range. Acknowledged the error and is currently working fine. It would be nice for an explanation on this. I wonder though if its not some sort of low voltage error of some sort.
I know this is an older post but I have had this error 3 times this week. It clears just fine and starts working, but I am getting tired of seeing my auto down.....not really any suggestions on how to fix the cause of the out of range error....any other thoughts on the matter??? thanks for the help