At firealarm.com, we’ve encountered similar issues with the Faraday ZN-2 panel before. First, ensure that the smoke detectors are properly installed and not obstructed in any way. Check if there are any loose connections or damaged wiring. Sometimes, a simple reset of the panel can resolve minor issues. If the problem persists, it might indicate a faulty detector or a malfunction within the panel itself. In such cases, it’s best to contact a qualified technician for further diagnosis and repair.