wont let u full set wont count down?

all devices work and register on walk test all items work wen in test ie external bell internal bell strobe
but when u put user code in and press full it wont count down can u sugest anything please
it as on board keypad and keypad down stairs
both keypads wont let u count down to set the system continus intermitant bleeps
but both will let programm the system ie in engineer mode and user mode