The short answer
Check the lithium battery is on and the battery-to-inverter comm connection; BMS error codes mean battery manual / service.
Plain explanation
From the Growatt manual for the SPH 3000-6000TL BL-UP: Check the lithium battery is switched on. Installer checks the battery-to-inverter comm connection. 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
- Check the lithium battery is switched on
- Installer checks the battery-to-inverter comm connection
- BMS Warning/Error XXX → check battery manual, Growatt service
Source
Growatt SPH 3000-6000TL BL-UP Installation & Operation Manual (Growatt doc, distributor-hosted), §9.2 Fault list, §9.2 BMS COM Faultmidsummerwholesale.co.uk ↗
Where installers ask this
- Help, Growatt + Pylontech (r/SolarDIY)
- reddit.com/r/SolarDIY/comments/1rovstx/
- reddit.com/r/SolarUK/comments/1c4gv9q/
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.