Panasonic KX-T336 System Reference Manual page 1486

3.32 OHCA SW failure (TSW card)
Error Code
Possible cause of
the malfunction
Countermeasures
Note
D 000
1) "OHCA" is assigned to BS02 in the slot assignment, but TSW-OHCA card
(KX-T336105) is not installed
No
Change the assignment
None
14-E-35
Do you use "OHCA" ?
Yes
Is the "TSW-OHCA" card
installed ?
Yes
Replace the TSW card
End
No
Install the TSW-OHCA card