filippop Welcome to the forum next time you have a question please start a new thread as this problem has been solved so many techs will not read this to help you. As Bobby said your backup battery has failed. You need to have the battery replaced (part# P-01H-F2G1) and your database reprogrammed


Merritt

Business Telephones & Equipment + Commercial Audio/Video Products
Commercial Communications . . . Turner, Maine
If it was built after 1980 don't expect it to work right.