Update fixed my problem
About two weeks ago I got the flow hood and I got the app downloaded opened and I got the Bluetooth to connect no problem. But when it came time to hit the “start” buttion to begin using the flow hood, nothing would happen. I was about to return it today when an app update came out and I gave it one more try. It now works as expected. Tech support never called back after being placed on the call back list, hopefully will never have a reason to talk to them.