Check the following:
Make sure the system type is EDACS.
Make sure that the 15 LCN frequencies are correct and in the correct order. Also, make sure that the first frequency (LCN 1) is on channel number 1 for whichever bank it is in.
Make sure that each of the 15 LCN frequencies is set to ED, not MO, FM, AM, CT, or DC.
In case you need a quick reference, the 15 LCNs in correct order are:
01. 866.3250 02. 866.7750 03. 867.2500 04. 867.7750
05. 868.2750 06. 868.8375 07. 866.3500 08. 866.8250
09. 867.1000 10. 867.3250 11. 867.8000 12. 868.3500
13. 868.6875 14. 867.3000 15. 867.8500