Panasonic KX-TD500 System Reference Manual page 1423

3.02 System Reset caused by CPU Runaway (Restart Procedure)
Error Code
Possible cause of
the malfunction
Countermeasures
Note
0100 = Overflow of the watch dog timer.
0200 = Software Infinite Loop
1) External circumstance, such as induction noise
2) Hardware is defective
Does the trouble occur frequently?
Yes
No change in
condition
No change in
condition
Remove the LPR cards one by one
No change in
condition
No change in
condition
1) If a reset occurs 16 times/in one hour due to overflow of the watch dog timer,
the restart procedure is not activated and the system will be shut down.
Press the RESET button to restart the procedure.
* It is recommended to have a current copy of the program on disk or tape to
facilitate accurate and rapid recovery.
Replace the CPU card*
Replace the TSW card
Replace the Shelf
Consult the Service Center
End
15-E-5
No
OK
OK
OK
OK