RCA 2-9398 - Manual (Page 26)

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Problem Solution
No Display • If you are using battery power, try replacing
the battery.
• If you are using AC power, make sure that the
unit is connected to a non-switched electrical
outlet. Disconnect the unit from the plug and
plug it in again. Either the message WAITING
or the most recent record is displayed.
• Did you order Caller ID service from your local
telephone company? This unit requires that
you subscribe to Caller ID service in
order to work.
Data Error Message • The unit displays this message if it detects
anything other than valid Caller ID information
during the silent period after the first ring.
This message indicates either the presence of
noises on the line, or that an invalid message
has been sent from the telephone company.