Panasonic KX-T336 System Reference Manual page 284

Error Message
Probable Cause
CoLintermeasure
I I
Illegal code detected
Improper data is received.
Off line Execution is impossible during off-line.
Status is already set
Impossible change such as
[INS] 4 [INS], [OUS] + [OUS]
iS
attemDted.
Communication link IS defectwe. or backup
data is destroyea.
I
Execute during on-iine.
impossible.
i
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