Panasonic KX-T336 System Reference Manual page 1458

3.04 Basic shelf power down (DC)
Error Code
Possible cause of
the malfunction
Countermeasures
Note
0400
1) AC power cord is unplugged
2) Power Failure
3) Power Switch is turned off
4) Malfunction in the Power Supply Unit of the Basic Shelf, or the trouble with
the Power Supply System (Backboard, CPU card) of the Shelf
Did the above item 1), 2) or 3)
occur at the recorded time of the
Error Log ?
No
Does the trouble occur frequently?
Yes
No change in
condition
No change in
condition
*It is recommended to have a current copy of the program on disk or tape to
facilitate accurate and rapid recovery.
No
Replace the Power Supply Unit
Replace the CPU card*
Replace the Shelf
End
14-E-7
(70695)
Yes
No
OK
OK