2.5 TroubleshootingAppendix 2-11AppendixProblem Probable Cause Possible SolutionNothing is heard in thehandsfree mode.The unit does not ring.The display flashes thefollowing message.Set Time & Date“Headset” mode is selected.• The exchange line is notprogrammed to ring.• The Ringer Volume is setto “OFF”.The system internal clock isnot working properly.Set the mode to “Handset”.• To program exchange lines, refer to theInstallation Manual.• Increase the Ringer Volume. Refer to“Volume Control” in ProprietaryTelephone Settings.Contact your maintainer.If a power failure occurs...Your system allows certain extensions to make and receive calls on certain lines (PowerFailure Transfer) and retains system programming.Power Failure TransferA specific extension will be automatically connected to a specific exchange line. This providesexchange line calls between the following extensions and exchange lines.Exchange line 1 is connected to extension port 01.Exchange line 4 is connected to extension port 09.• All other conversations will be disconnected during a power failure.• Proprietary telephones (PT) cannot be used during a power failure. A single line telephonewill work in the event of a power failure. Connect a single line telephone to the above port.• When power is restored after a power failure, your system automatically restarts,maintaining as much of the previous system settings as possible.