Panasonic KX-TD500 System Reference Manual page 1444

3.23 LPR runaway
Error Code
Possible cause of
the malfunction
Countermeasures
Note
22xx
xx= 01 to 40 : Slot number
1) LPR is reset
Check the status of the related card
Faulty
Enter INS command from the
maintenance terminal
Check the status of the card
Faulty
Enter INS command from the
maintenance terminal
None
Replace the LPR card
15-E-26
INS
INS
End