Hi William , sorry to hear about the issue. Let’s start by checking the basics. Ensure that the detector is properly powered and the wiring connections are secure. Have you verified if there are any error codes on your control panel related to the SIGA-HFD? If possible, try testing the detector individually to see if it responds appropriately. Feel free to share any specific details on the unusual behavior, and we can work through the troubleshooting process together.