*8 puts it in to day mode and *9 in to night, but if the system has lost its programming it will only ring at defaulted port which is ext 10. there is a small battery on the board, tou have to open the system and it is on the main back board.this is a small one like a AA battery or a small disc one.I know it worked for many years and it still is working but because the memory battery failed you must of had a power out, it just went back to factory default. you will nead to change this battery before you reprogramme or else if the power goes again it will default

“I have not failed. I've just found 10,000 ways that won't work.”