The No Flow Sensor Alert is an indication that your Purezone has not been connected to the Internet for a period of time.  

This alert is an indication that the Purezone pump scan that runs every half hour and reports water flow has not reported any readings to the cloud because it is not connected to the Internet. 

Note:  If you just set up the Purezone, this issue will prevent your device from performing it's first Water Measurement

Perform the following troubleshooting:

Check your network connectivity in the Purezone App

• You will see the last time your SENSE was connected to your home Wi-Fi network

Check battery strength 

• Follow these steps to check the battery strength
• If the battery strength shows 1 bar of battery strength, you should charge the battery pack
• If the battery pack is not fully charged it can cause the device to loose connectivity to your Wi-Fi network

Charge the battery pack

1. Take the Purezone out of the spa  
2. Wrap the cassette holder portion of the Purezone in an old towel or paper towels
3. Take the device inside and place the battery pack on the wireless battery charger
4. The battery pack is charging when the green Indicator light on the battery pack illuminates.  If the green indicator light does not turn on, reposition the battery pack on top of the wireless battery charger
5. The battery pack is fully charged when the green indicator light turns Off

If you have made no changes to your original Wi-Fi network, your device should connect to the network again and will be online.  You can replace the Purezone device in the spa.

If you are still not online, follow these steps to reconnect the Purezone to your home Wi-Fi network

1. Approach the area where the Purezone is located and be within 6 feet of the device
2. Tap the Gear icon (Settings) in the upper right-hand corner
3. Select "Wi-Fi Settings"
4. "Update Wi-Fi" - Choose a Network... will appear  
5. Tap to select your Wi-Fi network
6. Enter the password
7. Tap Join
8. Tap Continue
9. You are now connected