AT&T Door Phone Controller - Manual (Page 80)

Table 7-1. Troubleshooting Procedures (Continued)
Trouble Possible Cause Possible Solution
Cannot open door remotely Improper wiring to existing door Verify all connections when
using either Remote Door strike device. May be caused connecting the door strike
Open Button or the Door by improper connection and use contacts on the AT&T Door
Code of NO (Normally-Open), NC Phone Controller to existing
(Normally Closed), and C door open buttons. Make sure
(Common) door latch relay of the following:
contacts, especially when
interfacing these contacts to 1. The NO and C contacts
existing door configurations. are connected in parallel to a
normally-open button.
2. The NC and C contacts
are connected in series to a
normally-open button.
Selected options are not Incorrect or inappropriate values Use Verify mode to confirm
operating as expected were entered. selected options without
changing the values.
Carefully consider the
“consequences” of options
chosen.
Maintenance
Periodic maintenance is not required.
Units requiring repair are returned to AT&T for service.
7-4 Troubleshooting and Maintenance