Crazy Sensors! Keep on and off every secons

I do recently configured the Alarm Pro with the interface (12 zones). Everything went fine with the tuning of the orange led but then when I configured the sensors in Homeassistant I realized that they are keep getting fired for no reason!

Any idea on what it could be?

This appears to be a repost question from Reddit:
https://www.reddit.com/r/konnected/comments/1jbuymx/crazy_sensors_keep_on_and_off_every_second/

The solution is to make sure that VREF on the interface module is correctly connected to the AUX +/- on the old alarm panel before tuning the potentiometers.