I have been having a random, but constant reoccurrence of a CHECK103 0000 error, which is typical with a loss of internal communication. Everything regarding the GSM and ECP have been fine, and all diagnostics check out. I came across a more obscure Honeywell document to diagnose this issue (http://www.froulaalarms.com/cd/Loss-of- ... ta-Low.PDF), and had me try taking off the AD2pi from the system. Well, that did the trick. I reviewed the installation and settings, particularly with the correct keypad setting, and they seemed ok. As long as I keep the AD2pi disconnected from the panel, I don't get the error. Once I reconnect it, it will throw the CHECK issue.
Anyone experience this, and maybe have a solution?