At firealarm.com, we’re here to assist you with troubleshooting your Notifier NP-200-IV. First, ensure all wiring connections are secure and proper power is supplied to the panel. Check if there are any fault indicators lit on the panel, which can give clues to the issue. Additionally, review the programming settings to ensure they are correctly configured for your application. If problems persist, feel free to provide more details, and we’ll help you pinpoint the issue.