I am in he process of programming the PLU keys. Key numbers 1, 11 and 15 won't allow me to program them. The other 12 were no problem. 11 and 15 are preset price keys. 1 should be open to add the inputs from the number pad. When I go through the sequence and hit x/time to finalize the programming I get the dreaded E1 code.
Robert
August 2013