Sony SPP-A941 - Manual (Page 41)

Additional Information 41 US
Additional Information
Message counter
The message counter on the base unit shows the following information.
When the counter shows
Flashing number
CL
A
F
It means
Number of messages not yet played back.
Flashes when the day and time is cleared or delayed due to a
power interruption, or when you connect the base unit to the
AC outlet for the first time. Reset the time correctly (page 24).
The announcement only mode is selected (page 32).
The recording area is full. Erase unnecessary messages (page 31).