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Error codes by brand

Qingdao Nahui Energy Technology error codes

50 codes documented in Qingdao Nahui Energy Technology's inverter and battery manuals. Pick yours to see what it means, what you can safely check, and when to call your installer.

WattMate is not affiliated with Qingdao Nahui Energy Technology. This page summarises Qingdao Nahui Energy Technology's own published documentation; your installer and Qingdao Nahui Energy Technology are the authority on your system. WattMate doesn't repair systems or make site visits.

Inverter codes

  • AC HCT FaultAC Current Sensor Fault.
  • AD Sample FaultThe sample value between master and slave is not consistent.
  • Bat Low FaultThe battery power is low.
  • Bat Volt FaultBattery voltage fault.
  • BatConDir FaultThe battery connection is reversed.
  • BMS Cell FaultBattery cell error.
  • BMS Dcov FaultBattery input over voltage error.
  • BMS IN_COM FaultBMS internal communication fault.
  • BMS Other FaultBattery other error.
  • BMS Protect ChrOCBattery over current charging protect.
  • BMS Protect DischargeOCBattery over current discharging protect.
  • BMS Protect LVBattery under voltage protect.
  • BMS Protect OVBattery over voltage protect.
  • BMS Protect TemHighBattery temperature is high.
  • BMS Protect TemLowBattery temperature is low.
  • BMS Relay FaultThe battery relay is fault.
  • BMS RV FaultBattery input transposition error.
  • BMS Tepr FaultBattery temperature sensor error.
  • BMS Volt FaultBattery voltage sensor error.
  • BMS_LostThe communication between BMS and Inverter is interrupted.
  • Bus Volt FaultBus voltage out of range detected by hardware.
  • ByPassRelayFaultBypass relay fault.
  • DCI OCP FaultDC component is out of limit in output current.
  • DCV OVP FaultDC component is out of limit in output voltage.
  • Dsp Lost FaultSCI communication fault.
  • EPS Over LoadOver load in off grid mode.
  • EPS Relay FaultThe EPS relay always keeps open.
  • GFCI HW FaultThe residual current circuit is fault.
  • Grid Freq FaultGrid frequency out of range.
  • Grid Lost FaultGrid is lost.
  • Grid Relay FaultThe grid relay always keeps close.
  • Grid Volt FaultGrid voltage out of range.
  • HW Protect FaultInverter over current or battery over current or PV over current detected by hardware.
  • Inter Fan FaultFan Device Fault.
  • Inv EEPROM FaultThe master eeprom is fault.
  • Iso Check FaultThe isolation is failed.
  • LmtByEPMThe device's output is under controlled
  • Meter Lost FaultThe communication between meter and Inverter is interrupted.
  • Mgr EEPROM FaultThe manager eeprom is fault.
  • NO-BatteryBattery is not connected
  • Other Dev FaultOther device fault.
  • OV-G-V02Grid voltage exceeds the upper voltage range
  • PV Volt FaultPV voltage out of range.
  • PVISO-PROEarth Fault Alarm
  • RC OCP FaultThe residual current is high.
  • SPI CommFaultThe communication between master and slave fault.
  • SW OCP FaultOutput current high detected by software.
  • Temp Over FaultThe inverter temperature is high.
  • UN-G-F01Grid frequency exceeds the lower frequency range
  • Vgrid 10M FaultThe grid voltage is out of range for the last 10 minutes.

Find the Qingdao Nahui Energy Technology manual for your model

When to call your installer or the warranty line

Your installer is your first warranty contact. If they've gone, the manufacturer's warranty line still covers the hardware. Don't open the inverter or battery case yourself: work inside it is for a licensed electrician.

If you see smoke, scorch marks or smell burning, switch the system off at the AC and PV isolators and call your installer. If anyone is in danger, call 000.

We don't have a warranty line on file for Qingdao Nahui Energy Technology yet. See the manufacturer contacts we do hold, or ask your installer.

  1. Try the free fixes first

    Most faults are an isolator, a WiFi drop or a known error code. Start with the lookup and guides above.

  2. Then call the people who are responsible for it

    Your installer is your first warranty contact. If they've gone, the manufacturer's warranty line still covers the hardware.

    Find the manufacturer's warranty line

  3. If it's near the end of its life, see what replacing it would do

    A free energy audit report sizes a new system for your actual bills and shows what a replacement would do. Your first results need no details; your details only reach installers if you ask for the full report.

    Get your free energy audit report