Thank you for getting in touch and sorry to hear you are having problems. You need to be on the same WiFi network as your control box in order to see the control panel. Our troubleshooting guide can be found here and there is a bit more on this topic:
I have it connected to my wi fi in online mode. However whe I go to the Harvest web app and try to open : Device Control Panel I get white screen.
Its strange as it look like the control unit is connected as I can see the tempersture in side .
Thank you for getting in touch and sorry to hear you are having problems. You need to be on the same WiFi network as your control box in order to see the control panel. Our troubleshooting guide can be found here and there is a bit more on this topic:
link
Please let us know if you continue you have problems.
Many thanks! Stacy