Fault Code Reference

Anker Fault Codes

Anker SOLIX home battery storage systems. Modular lithium battery storage designed for solar self-consumption in UK residential installations.

30
Fault codes
Device types covered
Inverter (30)

Common fault codes

EE
Earth Fault
Power down — BAT switch OFF, grid breaker OFF
PV_OV
PV Overvoltage
Measure open-circuit voltage of each string before connection
GRID_FAULT
Grid Fault / Grid Abnormal
Measure AC voltage at AC GRID port — should be 230 VAC ±10%
BAT_FAULT
Battery Module Fault
Check all DC connectors (BAT+ / BAT−) are fully seated and clicked
COMM_FAULT
Communication Fault
Check all RJ45 cables between modules are seated — click audible
OT_FAULT
Over-Temperature Fault
Check heat sink on rear of power module is clear of obstruction

All Anker fault codes

EE
Earth Fault
Power down — BAT switch OFF, grid breaker OFF
PV_OV
PV Overvoltage
Measure open-circuit voltage of each string before connection
GRID_FAULT
Grid Fault / Grid Abnormal
Measure AC voltage at AC GRID port — should be 230 VAC ±10%
BAT_FAULT
Battery Module Fault
Check all DC connectors (BAT+ / BAT−) are fully seated and clicked
COMM_FAULT
Communication Fault
Check all RJ45 cables between modules are seated — click audible
OT_FAULT
Over-Temperature Fault
Check heat sink on rear of power module is clear of obstruction
GRID-OV
Grid Overvoltage
Measure grid voltage
PV-REV
PV Reverse Polarity
Power off PV switch
ISO-FAIL
Isolation Failure
Power down
GRID-UV
Grid Under-Voltage
Measure grid voltage at inverter AC terminals with multimeter -- UK nominal 230 …
GRID-OF
Grid Over-Frequency
Wait 5 minutes -- inverter should auto-reconnect when frequency returns to norma…
GRID-UF
Grid Under-Frequency
Wait for auto-recovery
PV-SC
PV Short Circuit
Power down. Disconnect DC strings from inverter
PV-OC
PV Over-Current
Check panel Isc on datasheet -- must be below 16A
DC-ARC
DC Arc Fault Detected
Power down immediately
AC-OC
AC Over-Current
Check loads connected to backup circuit -- shed non-essential loads
RELAY
Relay Fault
Power cycle: turn off grid AC isolator and battery, wait 60 seconds, restart
FAN
Cooling Fan Fault
Check external vents are clear of obstruction -- minimum 200mm clearance above
CT-ERR
CT / Power Sensor Error
Confirm CT clamp cable is plugged into RS485 port on inverter
APP-OFFLINE
System Offline / No Cloud
Check router is online and WiFi is working
GRID-EXP
Export Limit / CT Mismatch
Confirm CT arrow faces toward grid meter (away from loads)
BAT-UV
Battery Under-Voltage
Allow battery to charge from solar or grid -- if grid is available inverter shou…
BAT-OV
Battery Over-Voltage
Power cycle battery: turn battery breaker OFF for 60 seconds then ON
BAT-OT
Battery Over-Temperature
Check ambient temperature at battery -- must be below 45 C during operation
BAT-UT
Battery Under-Temperature
Check ambient temperature at battery -- LFP cells cannot charge below 0 C
BAT-OC
Battery Over-Current
Check total load on backup circuit -- must be within inverter backup rated outpu…
BAT-COMM
Battery Communication Lost
Power down. Check BMS communication cable between inverter and battery -- reseat…
BAT-CELL
Cell Imbalance / BMS Balancing
If temporary: allow a full charge cycle -- balancing completes at top of charge
BAT-BMS
BMS General Fault
Power cycle battery module: turn battery breaker OFF for 60 seconds then ON
BACKUP-FAIL
Backup Output Fault
Check backup circuit MCB in consumer unit -- reset if tripped
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