First, check if the panel is displaying any trouble indicators or error codes. This can give us a clue as to what might be going wrong. Then, ensure that all devices (detectors, pull stations, etc.) are properly connected to the panel and functioning correctly. If there are no visible issues, try resetting the panel and see if that resolves the problem. If the issue persists, it might be a deeper electrical or programming issue that would require further investigation by a certified technician.