The STI Sensors have a reset time built into them to avoid multiple alarms back to back. If you are testing the unit and the sensor is open you should be able to hear it “ticking” during and after each activation. The sensor will not send another alarm signal until this ticking done.
Category: STI
Troubleshooting my STI Alarm System
1. Double Check that the antenna is installed in the right location. This is a common cause of intermittent problems.