Hi, can any one help? I've had the Yale 6400 alarm for some years now but recently I got an exclamation mark light on the CPU which, after having changed batteries here and there plus on the outside alarm itself I eventually was able to get the exclamation light to go out. However, I now seem not to be able to turn off the entry/exit time in/out sounds even after selecting 'off' on both and confirming it. Does anyone know what the problem might be?
Many thanks
Many thanks