Why is the signal bar icon on the Dashboard sensor card not green?

Answer

The signal icon on the sensor card is an indicator of the sensor's performance, which is identified by the color:

• A red icon means the sensor is at it's worst functional signal strength.  It will report a single reading every 15 minutes if received by the gateway and backlog pulls are not possible.  
• A yellow icon means the sensor can work as intended with temperature readings every 5 minutes and backlog pulls are possible.  However, if the environment changes in any way it could degrade to red.
• A green icon means the signal between the sensor and the gateway is good, and that data is being successfully transmitted.

Obviously, the desired condition would be a green signal for all sensors. To resolve the issue where the signal is not green, you need to carry out one or more of the following:

• Make sure there is nothing near the gateway that could block the signal from the sensors.
• Make sure there is nothing near the sensors that could block the signal to the gateway.
• Move the gateway closer to where the sensors with a yellow or red icon are located, making sure not to weaken the signal from sensors that have a green icon.
• Add another gateway closer to where the sensors with a yellow or red icon are located.

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For more information on the Dashboard sensor cards see:

• To view sensor data for a location (in the Mobile App)
• To view sensor data for a location (in the Server App)

What is a backlog?

When a sensor cannot send data it has collected (readings) to the gateway for transmission to the server, it stores the data on the sensor -- referred to as a backlog. When communications between the sensor and the gateway is re-established with an acceptable strength, the backlog is transmitted to the server.