An AI search for code 1148 returns this (which seems about right) - i’m assuming you have either an all in one or a single phase inverter with battery in which case their should be a cable from the inverter to the battery or from the inverter to the hub (a CAN bus cable which looks similar to an ethernet cable on the battery and a multi-core cable to the HUB - see the attached).
The Fox inverter error code 1148 indicates a communication problem between the inverter and the Hub/battery management system (BMS).
A common cause is a missing or faulty communication line/dongle connection between the devices.
Troubleshooting Steps
Check Physical Connections:
Ensure the BMS CAN cable is securely and correctly connected between the inverter's designated port and the master battery/Hub. Some inverters have multiple ports that look similar, so refer to your manual to confirm the correct port is used.
Verify that any communication dongle is properly inserted into the inverter.
Restart the System:
Follow the proper shutdown procedure: turn off the PV (solar) input, then the AC (grid) supply, and finally the battery.
Wait a few minutes.
Restart the system in the correct sequence: turn on the AC supply first, then the PV input, and finally the battery. This may clear a temporary communication glitch.
Check for Other Issues:
If the issue persists, check the battery and inverter firmware versions to ensure they are up to date, as outdated firmware can sometimes cause communication problems.
If you have a new system and the problem continues, or if you are unsure about any steps, contact your installer or Fox ESS support directly. They can provide further guidance, perform remote diagnostics, or arrange for a technician to inspect the system.