After the HA pair has been configured, failover peer status errors will appear on the System Faults monitor in the Manager Dashboard page for the selected admin domain (if enabled). You can also view this information by going to Faults tab under Manager → <Admin Domain Name> → Troubleshooting → Logs. The errors continue to appear until you connect the heartbeat cables.
The status of the communication between the Sensors can be monitored on the Sensors tab of Device Manager page of the Web-based user interface or directly from the CLI of either Sensor.
The Sensors represented by the figure Running cables might therefore be properly connected, but just need to be restarted.
On the CLI, you can instead run the command from either Sensor. The output includes the failover Enabled and Peer Status fields. The former indicates whether the Sensor at hand has been configured to be part of a HA pair, and the latter shows the current state of the communication between the two Sensors.
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In the figure Sensor CLI shows failover-status window, the Sensor is part of a HA pair, and the pair is successfully communicating over the heartbeat connection.