On the magikist you should be able to program 3
coins as well as the 2 it comes programed with as a default. Try programming the
coin that it is not accepting to one of the programmable
coins. Also check to see that both of the preprogrammed
coins are in the acceptance mode. If you touch the wrong button it will turn them off. Download a owners manual from
Kleenrite or similar supply house. The magikist are a pretty good acceptor IMO.