Can't open the web app

If the web app won't load (or shows OFFLINE / DEVICE OFFLINE in the status bar), work through these:

Same network?

Your phone or computer must be on the same network as the panel. A phone that's quietly on mobile data, or on a guest network, can't see the panel. If you're away from the van entirely, the panel-served web app is out of reach — that's what the Remote Dashboard is for.

Right address?

The panel's IP can change when the router hands out new addresses. Read the current IP off the panel itself: Settings → Network, in the status column. If this keeps happening, give the panel a static IP or a reservation in your router.

Panel busy?

The panel serves a limited number of simultaneous browser connections. A page that suddenly stops responding while other things (another phone, a wall tablet) are hammering it usually recovers by itself — close the other sessions, wait half a minute, and reload the page.

Last resort

Restart the panel from its touchscreen (Settings → System → Restart) and reload the page once it's back.