What does error code E0 (dialer trouble) mean on the SK-5207, and how do I troubleshoot it?

On the SK-5207, the error code E0 indicates a trouble with the dialer [11].

This code is displayed on the built-in touchpad to signal a general dialer failure (Page 44) [11].

To troubleshoot this condition: 1. Check the phone line DC voltage; the panel sounds a trouble if the voltage drops below 3 VDC for more than 40 seconds (Page 23) [11].

1. Ensure the phone line monitor is enabled for all lines in use and disabled for any unused lines (Page 7-25) [11].

2. Verify line seizure is functioning correctly, as the dialer must disconnect local telephones to communicate with the central station (Page 23) [11].