I believe it is telling you it is not registered with the Base Unit. You did get the Base Unit with it didn't you, otherwise you have a paperweight.
If you do have a set then this is the answer
Tip 1 of 1
Place the handset in the base or charger. If PRESS FIND HS 4 SEC ON BASE
does not appear on the screen after a few seconds, lift up handset and recradle it in the base or charger.
On the telephone base, press and hold FIND HANDSET
for approximately four seconds. Release FIND HANDSET
once the IN USE
light comes on.
After a while, the handset will emit a series of tones, and the newly registered handset will be assigned the lowest extension number not previously assigned to another system handset when successfully registered. Repeat Steps 1 and 2 if the handset does not successfully register to the telephone base within two minutes.
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