Yes! Like the Partners Big Brother the Magix/Legend which ultilizes touch-tone receivers to preform analog functions like turning on/off message waiting lights, so does the Partner ACS system. Referred to as "registers" in the Partner, if yours are non-functional, you will get delayed lights. Circuit Modules most responsible for the "registers" are the 200 Card and Voice Mail card. You will need to replace the suspect card. Be sure your AAA Back-up batteries are fresh (ACS) Good Luck!