Fault Code Reference

SolaX Fault Codes

SolaX hybrid inverters including X1 and X3 series with T-BAT battery storage. Popular across UK installations with G4 generation products and SolaXCloud monitoring.

96
Fault codes
Inverter (96)

Common fault codes

SPI Fault
SPI Comms Fault
DC isolator off, wait 30 seconds, restart.
SCI Fault
SCI Comms Fault
DC isolator off, wait 30 seconds, restart.
CAN1 Fault
CAN Bus Comms Fault
Full power cycle: AC off, battery off, wait 60s, battery on, AC on.
PV Config. Fault
PV Array Config Error
Check string polarity. Restart.
Inv. EEPROM
Internal Memory Failure (IE 26)
Power cycle.
Relay Fault
Internal Relay Fault
Shut down system immediately.

All SolaX fault codes

SPI Fault
SPI Comms Fault
DC isolator off, wait 30 seconds, restart.
SCI Fault
SCI Comms Fault
DC isolator off, wait 30 seconds, restart.
CAN1 Fault
CAN Bus Comms Fault
Full power cycle: AC off, battery off, wait 60s, battery on, AC on.
PV Config. Fault
PV Array Config Error
Check string polarity. Restart.
Inv. EEPROM
Internal Memory Failure (IE 26)
Power cycle.
Relay Fault
Internal Relay Fault
Shut down system immediately.
Sample Fault
Detection Circuit Fault
Contact SolaX immediately.
RCD Fault
RCD Fault (IE 27)
Check DC/AC impedance. Full restart.
Fan1 Fault
Fan 1 Device Fault (IE 112)
Restart. Check for visible blockage (do NOT open unit).
Fan2 Fault
Fan 2 Device Fault (IE 113)
Restart. Check for visible blockage.
AC HCT Fault
AC Current Sensor Fault
DC isolator off, restart.
Overload Fault
EPS Mode Overload (IE 16)
Turn off high-power loads. Press ESC on LCD to restart.
EPS OCP Fault
EPS Overcurrent
Remove non-linear loads. Restart.
EPS Relay Fault
EPS Relay Fault (IE 29)
Full restart.
TZ Protect Fault
Overcurrent Protection (IE 01)
Wait for auto-recovery. Restart if not.
DCI Device Fault
DC Injection Device Fault
Full restart.
Grid Lost Fault
No Grid Connection (IE 02)
Check main consumer unit breaker. Check if neighbours have power.
Grid Volt Fault
Grid Voltage Out of Range (IE 03)
Set Advanced Setting > Export Control to reduce export or enable voltage respons…
Grid Freq Fault
Grid Frequency Out of Range (IE 04)
Auto-reconnects. Contact DNO if frequent.
PLL Lost Fault
Grid Sync Failure
Auto-reconnects.
Bus Volt Fault
Internal Bus Voltage Fault (IE 06)
Full restart.
Inv OCP Fault
Inverter Overcurrent Protection
Wait for auto-recovery.
PV Volt Fault
PV String Voltage Fault (IE 05)
Check open-circuit voltage of strings vs inverter MPPT range.
Isolation Fault
Insulation Resistance Fault (IE 13)
If morning only and self-clearing: condensation false positive -- update firmwar…
Temp Over Fault
Overtemperature (IE 14)
Check fans running. Check clearances (300mm all sides, 500mm bottom). Check ambi…
C1 CAN
Battery CAN Comms Fault
Check LCD Battery Type setting matches installed battery. Re-seat CAN cable. Che…
C1 TEMP
Charger Overtemperature
Check ventilation. Confirm ambient temperature is within range.
C1 Bus OVP
Charger Bus Voltage Over Limit
Wait for auto-recovery.
C1 Temp Low
Charger Below Minimum Temperature
Check ambient temperature. Battery will not charge below minimum -- normal in ve…
C1 Bat OVP
Battery Over-Voltage
Wait for auto-recovery.
C1 Charger OCP
Charger Overcurrent
Power cycle.
C1 EEPROM
Charger Memory Fault
Power cycle.
CT Fault
CT / Smart Meter Fault (IE 37)
Check CT is on L wire only, arrow pointing toward grid. Check CT connection at i…
DM9000
WiFi Module / Monitoring Fault
Check dongle buckle clips aligned correctly. Power cycle inverter. Check WiFi cr…
RTC Fault
Real-Time Clock Fault
Power cycle.
AC5M Volt Fault
Grid Voltage Out of Range 5 Minutes
Auto-reconnects. Log with SolaXCloud. Contact DNO if frequent.
AC10M Volt Fault
Grid Voltage Out of Range 10 Minutes (IE 08)
Contact DNO with timestamped voltage log from SolaXCloud.
IE 07
Battery Voltage Fault
Check battery voltage on LCD (System Status, Battery) against the battery spec.
IE 09
DCI Overcurrent Protection
Wait for auto-recovery.
IE 10
DCV EPS Overvoltage Protection
Wait for auto-recovery.
IE 11
Software Overcurrent Fault
Wait for auto-recovery.
IE 12
RC Overcurrent Protection
Check the impedance of DC input and AC output.
IE 15
Battery Connection Direction Fault
Isolate the system fully, then verify battery cable polarity at both ends before…
Arc Fault
PV Arc Detected (IE 17 X3 / IE 22 X1)
Inspect PV string cabling and MC4 connectors for damage or loose mating.
IE 18
Battery Power Low
Switch off high-power loads and press ESC to restart.
IE 19
BMS Lost -- Battery Comms
Check the comms cable is seated at the inverter BAT port and the battery BMS por…
IE 20
Fan Fault
Check for visible debris around the fan (do not open the unit).
IE 21
Low Temperature Fault
Check ambient temperature at the install location; wait for it to rise.
IE 23
Other Device Fault (X1)
Update inverter firmware and press ESC to restart.
IE 25
Internal Comms Fault
Restart the inverter.
IE 28
Grid Relay Fault
Disconnect PV, battery and grid, then reconnect.
IE 30
PV Connection Direction Fault
Isolate the system, then verify PV string polarity with a meter before reconnect…
IE 31
Battery Charge Relay Fault
Press ESC to restart the inverter.
IE 32
EPS Earth Relay Fault
Press ESC to restart the inverter.
IE 33
Parallel Fault (X3)
Check parallel comms and earth cable connections between inverters.
IE 36
Hard Limit Fault (X3)
Check the HardLimit value in Export Control settings against the DNO agreement.
IE 101
Power Type Fault
Upgrade firmware and press ESC to restart.
IE 102
EPS Port Overcurrent Warning
Check EPS load against the system rating, then press ESC to restart.
IE 103
Manager EEPROM Fault
Shut down PV, battery and grid, then reconnect.
Arc Self-Test Fault
Arc Self-Test Fault (IE 104 X1 / IE 115 X3)
Manually clear via the ARC Clear menu and re-run the self-test.
IE 105
NTC Sample Invalid
Check the NTC is properly connected and in good condition.
IE 106
Battery Temperature Low
Check the battery installation environment.
IE 107
Battery Temperature High
Check battery ventilation and heat dissipation around the modules.
IE 109
Meter Fault
Check the meter is compatible with the inverter and powered.
IE 110
Bypass Relay Fault
Press ESC to restart the inverter.
IE 111
Arc Hardware Fault (X3)
Record inverter SN and firmware version from the About menu.
BE 01
BMS External Comms Error
Check the comms cable between inverter and battery.
BE 02
BMS Internal Comms Error
Power cycle the battery.
BE 03
BMS Overvoltage
Power cycle the battery and monitor.
BE 04
BMS Undervoltage
Recharge the battery above the protection level (enable grid charging if needed)…
BE 05
BMS Charge Overcurrent
Power cycle the battery and monitor charge current.
BE 06
BMS Discharge Overcurrent
Reduce discharge load, then power cycle the battery.
BE 07
BMS Temperature High
Check battery ventilation and ambient temperature.
BE 08
BMS Temperature Low
Check ambient temperature and battery heating settings.
BE 09
Cell Imbalance
Allow a full balance charge -- charge to 100 percent and hold for several hours.
BE 10
BMS Hardware Protection
Record battery model, SN and BMS firmware version.
BE 11
BMS Circuit Fault
Restart the battery.
BE 12
BMS Insulation Fault
Check the battery is properly earthed, then restart the battery.
BE 13
BMS Voltage Sensor Fault
Power cycle the battery.
BE 14
BMS Temperature Sensor Fault
Restart the battery.
BE 15
BMS Current Sensor Fault
Power cycle the battery.
BE 16
BMS Relay Fault
Power cycle the battery.
BE 17
Battery Type Unmatch
Check the battery type setting on the inverter LCD matches the installed battery…
BE 18
BMS Version Unmatch
Upgrade the battery BMS firmware.
BE 19
BMS Manufacturer Unmatch
Upgrade the battery BMS firmware and confirm the battery model is supported.
BE 20
BMS Software Unmatch
Upgrade the battery BMS firmware.
BE 21
BMS Master/Slave Unmatch
Check module DIP switch addressing (each module needs a unique address).
BE 22
Charge Request No Response
Upgrade the battery BMS firmware, then power cycle.
BE 23
BMS Software Protect
Upgrade the battery BMS firmware.
BE 24
BMS 536 Fault
Power cycle the battery.
BE 25
BMS Self-Check Fault
Power cycle the battery.
BE 26
BMS Temperature Difference
Check module ventilation and spacing is even across the stack.
BE 27
BMS Break Fault
Power cycle the battery.
BE 28
BMS Flash Fault
Record battery model, SN and BMS firmware version.
BE 29
BMS Precharge Fault
Full power cycle: AC off, battery off, wait 60 seconds, battery on, AC on.
BE 30
Battery Breaker Open
Check the battery breaker is ON.
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