BMS lost error

[Bob&I]

Hi, my inverter shows ‘BMS Lost’ as an active error.
The app's showing as offline and we've had no data feed for 2 days with everything showing '0'.
The red warning light on the inverter itself is flashing red and the dongle is fast flashing red.
So far no luck with getting a solution from our installer.
I'm hoping this doesn't mean there's no PV production to the house or battery.
Any thoughts on how to resolve would be very welcome.
Thanks
Phil

Our set up:
Fox ESS H1-5.0 inverter
Fox ESS ECS4800-H3 (13.98 kWh total) battery
4.25 kW PV array
8kW Air source heat pump

[nrb501]

"BMS Lost" means the inverter has lost comms with the battery management system.
Very likely you will be having no power generated by the system.
Check the BMS cable between the inverter and the battery for damage and that the connectors are seated correctly.
Check the battery status indicators then try a complete restart of the system
Shut-down

• Switch off the solar input (switch at bottom left of inverter)
  Switch off AC input to inverter (red switch near inverter)
  Switch off battery (switch off the DC breaker on the battery

Wait 30 secs
Start-up

• Switch on PV input
  Switch on AC input
  Switch on battery DC breaker
  Press battery Power button

If you don't have the handbooks a copy for the inverter is here and the battery is here