Useful InformationFor assistance, please visit http://www.panasonic.com/phonehelp 57Error messagesIf the unit detects a problem, one of the following messages is shown on the display.TroubleshootingGeneral useDisplay message Cause/solutionPhonebook Full! L There is no space in the phonebook to store new itemsfrom the caller list or redial list. Erase unnecessary items(see “Erasing one item in the phonebook” on page 34).(Full) L There is no space in the phonebook to store new items.Erase unnecessary items (see “Erasing one item in thephonebook” on page 34).LOW BATT L No battery is installed.L The battery may need to be replaced with a new one (see“Battery replacement” on page 12).PowerFail L When the phone is disconnected from a power outlet orthere is a power failure, the battery works as emergencypower. When power is restored, “PowerFail” willdisappear on the display.Problem Cause/solutionThe unit does notwork.L Check the connections (page 14, 15, 16, 17).L Unplug the AC adaptor to reset the unit.Reconnect the adaptor and try again.The line indicators donot work properly.L Check the connections (page 14, 15, 16, 17).The unit does notring.L The ringer is set to “Off”. Turn it on (see “Turning ringeron/off ” on page 26).L The Do Not Disturb (DND) feature is turned on. Turn it off(see “Turning Do Not Disturb (DND) on/off” on page 27).L If there are several non-system phones on the line that donot ring, disconnect some of them. Having too manyphones connected can also result in low ringer volumeson non-system phones.