Why is CL ( or C ) flashing in the base message window?

BASIC TROUBLESHOOTING TIPS

How do I install a DSL filter?
Why is my Answering System not recording messages?
Why am I not receiving Caller ID?
I want to dial a phone number found in my Caller ID log, but the number is not displayed correctly. What can I do?
Can I leave my cordless handset in the charger when I'm not using it?
My battery pack does not last very long between charges. I am charging the handset more frequently. What should I do?
My phone is not working properly. Do you think purchasing a replacement battery(s) might fix the problem?
My telephone product is suddenly acting strange or stopped working altogether. What can I do?
I subscribe to a non-traditional telephone service (for example: magicJack, Skype or Windows Live Call) that uses my computer to establish a connection, and my phone is not working correctly.
My answering system plays my greeting to callers but will not record messages. Why?
How can I reduce static and noise on my phone?
Why is CL ( or C ) flashing in the base message window?
My Caller ID Announce (Voice Announce CID) isn't easy to understand at times.

Solution:

This indicates that you need to set the time and day on your answering system. During initial setup and any time there is a loss of power to the base, you will see this flashing indicator. Consult your User's Manual for instructions on setting the day and time. Manuals for most models can found on this site. Click on the PRODUCT SUPPORT > MANUALS link, then search for your particular model.