Inverter has lost CAN communication with the battery. Covers the same ground as Faultpath code E020. Common on Dyness and Fogstar pairings, which must use CAN, not RS485.
Common causes
CAN cable loose or wrong pinoutWrong battery brand selected on the inverterBattery switched off
What to check
STEP 1
Check the CAN cable is seated at the inverter BAT port and the battery, with the correct pinout.
STEP 2
Confirm the battery brand selected on the inverter matches the installed battery.
Escalate if
After all steps, note battery model, firmware and cable pinout
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