Panasonic KX-TD816 User Manual page 382

APPENDIX
Problem
The unit does not ring.
The display flashes the
following message:
Set Time & Date
THU JAN01 12:00A
382
Probable Cause
• The outside number is not
programmed.
• The Ringer Volume is set
to "OFF".
The system internal clock
does not work properly.
Possible Solution
• For programming outside
numbers, refer to the
Installation Manual.
• Increase the Ringer Volume.
Refer to "Initial Setting"
(Section 1).
Consult with an authorized
Panasonic Factory Service
Center.
User Manual