Fronius inverter web interface hangs and won't load. Any fix?

The short answer

Clear browser cache, do the AC-then-DC restart, update Datamanager firmware; factory reset is the last resort.

Plain explanation

From the Fronius manual for the Primo/Symo + Datamanager: Clear browser cache and cookies. Restart: AC breaker off, then DC switch off, wait about 30 s until display is fully dark, switch back on (installer if unsure). The rest of the checklist is below; work through it in order. Installer only: DC and AC work on a live PV system is dangerous, so owners should note the code and call their installer.

Steps from the source

Clear browser cache and cookies
Restart: AC breaker off, then DC switch off, wait about 30 s until display is fully dark, switch back on (installer if unsure)
Update to the latest Datamanager firmware
Last resort: factory reset via the configRevert link on the support page (all settings lost)

Source

Fronius support page: SnapINverter (Primo/Symo/Eco) state codes & Datamanager, Web interface sectionwww.fronius.com ↗

Where installers ask this

General guidance based on the manufacturer's manual or the named source. Always follow the current manual for your exact model and your national code. DC and AC electrical work is for qualified installers only. Not affiliated with or endorsed by any brand named; trademarks belong to their owners.