Panasonic KX-TD500 Programming Manual page 347

Error Code
E4007 Single - CO key duplicated.
Please assign the Single - CO key that has the different CO physical number on one PT.
E4008 Invalid directory number for DSS (DN) or VTR key.
Only DN of an extension can be assigned as DSS (DN) or VTR key.
E4009 DSS (DN) key duplicated.
Two DSS keys cannot have the same extension number.
E4010 Invalid directory number for PHANTOM key.
Only FDN of phantom extension can be assigned to phantom key number.
E4011 Cannot assign PDN key without assigning PDN key on CO-01.
The first PDN key should be assigned on CO-01.
E4012 Cannot change PDN key on CO-01 while other PDN or SDN keys exist.
Please change PDN key on CO-01 to another key type after deleting all PDN and SDN
assignments.
E4013 Cannot assign SDN key without assigning PDN key.
An SDN button should have its associated PDN button.
E4014 Cannot assign more than 8 SDN keys for one PDN key.
Up to eight SDN keys per PDN key can be assigned on eight different PTs respectively.
E4015 Invalid directory number for SDN key.
Only DN of an extension can be assigned to SDN key number.
E4016 SDN key duplicated.
Two SDN keys cannot have the same extension number.
E4017 Cannot assign SDN key to its own directory number.
Please assign SDN to a directory number other than its own.
E4018 Dial registration resource exhausted.
Cannot register any more because the system resource that stores extension mailbox
numbers (voice mail access codes) and One-Touch Dialling numbers has been
exhausted.
E4020 Invalid directory number for doorphone call destination.
Only DN of an extension can be assigned as a doorphone call destination.
E4021 Secret dial 'S' must be placed at the beginning and end of desired secret numbers.
Cannot assign Secret Dialling "S" that is registered in One-Touch dialling without
being even number.
E4022 Cannot assign PDN key as Prime Line - CO.
Please assign key number except for PDN key when the outgoing or incoming
preferred line is set to "Prime Line - CO."
E4023 Illegal trunk group number.
Please assign the trunk group number (1–48) on Group - CO key.
Programming Guide
Error Message
Description
Programming Error Messages
347