When power came back on phone flashes cl - Vtech 5867 Cordless Phone

A flashing CL means that you have to set the clock.

All that You need do is re-program Your machine as You did when You first set it up. The flashing cl shows up if there is a power outage and if Your machine is not backed up ith a battery to help save phone info.
Hope This Helps:

You can download the phone manual here:

http://www.home-electronics.net/ge/pc/IB/25942GE2_IB.pdf

It explains the time/date setting (done from the handset).

We had this same problem and seeing that the Manual is incorrect, I searched GE website manuals to find a different one that at least looked like the right model and found out how to clear the CL message code. This is just a time/day setting and it is to be done by the handset, not the base unit, With the handset, press the flash key, then press #8. You should now see the time flashing in the display. Adjust the time then press the pound key. Now the day is flashing in the display. adjust the day with the up arrow, then press the pound key to finish. Your base unit will announce the time and day is set and the CL is gone.... good luck

Program the clock. There are a some buttons on the back of the base unit that sets day of the week, hour, and minute.

set the CLock by holding down the buttons on the side of the answering machine - top button for day, middle button for hour, bottom button for minute

you dont--your phone company does that when the caller id is active

You need to reset the time after a power outage.  Press the Day/Check, Hour, and Minute buttons until the correct time is heard-- Press Day/Check until you hear the correct day announced. Then do the same with Hour, and then Minute. 

The CL flashing means the clock needs to be set.

All you have to do is reset the date and time and youre good.