The last day or so I noticed that opening/closing doors or windows no longer triggers the chime. The sensors are working and I see it communicating to the touchscreen pad.
They are less than a month old but I tried the batteries, rebooting the touchscreen, and yes-i checked the settings, volume is up and none of the sensors are silenced. None of the sensors set off the chime, they communicate to the system!!
Did you use the touchpad to see if those sensors are still set for chime?
Which touchscreen do you have? The older black one or the one that is white. If the back one make sure that the volume is turned up both on the side of the touchscreen and also through the settings. The white one only have volume adjustment in the settings.