As a technician at firealarm.com, I suggest starting with a few basic troubleshooting steps for your Bosch Security B9512G system. First, check the power source to ensure it’s properly connected and supplying adequate power. Next, examine the system’s connections, including wiring and communication cables, to ensure they are intact and not damaged. Additionally, review the system’s programming to ensure it’s configured correctly for your specific needs. If these steps don’t resolve the issue, it may be helpful to consult the system’s user manual or contact Bosch technical support for further assistance.