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Error codes by brand

FoxESS error codes

136 codes documented in FoxESS'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 FoxESS. This page summarises FoxESS's own published documentation; your installer and FoxESS are the authority on your system. WattMate doesn't repair systems or make site visits.

Battery codes

  • AFE communication failedCommunication failure with the AFE system.
  • AFE failed (UV/OV/UT/OT)AFE detected an unrecoverable fault.
  • BMU Communication failedBattery Management Unit communication has failed.
  • Charge over currentBattery is being charged with too much current.
  • Charge over powerBattery is being charged with too much power.
  • Discharge over currentBattery is delivering too much current.
  • Discharge over powerBattery is exceeding power delivery capacity.
  • HVB FUSE faultHigh Voltage Bus fuse has blown.
  • Internal total voltage sampling failedFailure in internal voltage measurements.
  • IVU Communication failedCommunication failure with the IVU.
  • Module Addressing failedFailure in battery module addressing.
  • Module FUSE faultFuse in the battery module has blown.
  • Other faultAn unspecified fault has occurred.
  • Over temperature faultBattery temperature is too high.
  • Over voltage faultBattery voltage is too high.
  • PCS Communication failedCommunication failure with the Power Control System.
  • Power failedPower supply to the system has failed.
  • Pre-Charge failedInitial charging sequence has failed.
  • Relay adhesionRelay has stuck in the ON position.
  • Relay drive failedFailure in the relay drive mechanism.
  • Relay Not CloseRelay is not closing properly.
  • Short circuit ProtectionA short circuit has been detected.
  • Shutdown failedShutdown procedure did not complete successfully.
  • Single Cell '0V' faultOne or more battery cells is at zero voltage.
  • SOH low protectionState of Health is too low for safe operation.
  • Temperature high permanent failedPermanent high temperature condition detected.
  • Temperature sampling failedTemperature sensors are not functioning correctly.
  • The Single voltage high permanently failedVoltage of a single cell is too high permanently.
  • Under temperature faultBattery temperature is too low.
  • Under voltage faultBattery voltage is too low.

Inverter codes

  • 10min Volt FaultThe grid voltage is out of range for the last 10 minutes.
  • 1030AC Overcurrent
  • 1034DC Component Current Fault
  • 1035High Leakage Current Fault
  • 1036Static Leakage Current Fault
  • 1040Unbalanced Grid Voltage
  • 1042Grid Frequency High
  • 1043Grid Frequency Low

Find the FoxESS 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 FoxESS 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
1044
Grid Phase Voltage Over Limit
  • 1045Grid Line Voltage Over Limit
  • ARM EEPROM FaultThe manager eeprom is fault.
  • Bat Boost FaultThe battery boost circuit mosfet is fail.
  • Bat Buck FaultThe battery buck circuit mosfet is fail.
  • Bat Power LowThe battery power is low.
  • Bat Relay OpenThe battery relay keeps open.
  • Bat Relay Short CircuitThe battery relay keeps close.
  • Bat Volt FaultBattery voltage fault.
  • BatCon Dir FaultThe battery connection is reversed.
  • Bms ChgCur HighBattery charge over current.
  • Bms ChgReq NoAckNo action for charging request.
  • Bms DchgCur HighBattery discharge over current.
  • Bms Ext FaultThe communication between BMS and inverter is interrupted.
  • Bms HW ProtectBattery hardware under protection.
  • Bms Insul FaultBattery insulation fault.
  • Bms Int FaultDIP switch at the wrong position; The communication between battery packs is interrupted.
  • BMS LostThe communication between BMS and inverter is interrupted.
  • Bms M&S UnmatchThe software between Master and Slave are not match.
  • Bms Mfg UnmatchThe cell manufacture is different.
  • Bms Relay FaultBattery relay fault.
  • Bms SwHw UnmatchThe slave software and hardware are not match.
  • Bms Temp HighBattery over temperature.
  • Bms Temp LowBattery under temperature.
  • Bms Type UnmatchThe capacity of battery packs is different.
  • Bms Ver UnmatchThe software between slaves are not matched.
  • Bms Volt HighBattery over voltage.
  • Bms Volt LowBattery under voltage.
  • BmsCellImbalanceThe capacities of cells are different.
  • BmsCircuit FaultBms hardware circuit fault.
  • BmsCurSen FaultBattery current sensor fault.
  • BmsTempSen FaultBattery temperature sensor fault.
  • BmsVoltsSen FaultBattery voltage sensor fault.
  • Bus OVPBus OVP - Disconnect PV (+), PV (-) with DC. - After the LCD switches off, reconnect and check again.
  • Bus volt faultBus voltage fault
  • Comm LostCommunication lost
  • Consistent FaultConsistent fault detected
  • Dci Cons FaultThe dci sample value between master and slave is not consistent.
  • DCI FaultDC component is out of limit in output current.
  • DCI over rangeDC input current over range
  • EEPROM FaultEEPROM fault detected
  • Eps Over LoadOver load in off grid mode.
  • Eps Relay FaultThe eps relay is failed.
  • GFC FaultGFC Fault - Disconnect DC and AC connector, check the surrounding equipment on the AC side. - Reconnect the input connector and check the state of inverter after troubleshooting.
  • GFCD FaultGround fault circuit detection fault
  • GFCI faultGround Fault Circuit Interrupter fault
  • Grid 10Min OVPGrid over voltage
  • Grid freq faultGrid frequency fault
  • Grid Lost FaultGrid is lost.
  • Grid volt faultGrid voltage fault
  • Grid Voltage FaultGrid voltage fault
  • Grid10MinOVPGrid voltage over protection
  • GridF Cons FaultThe grid frequency sample value between master and slave is not consistent.
  • GridV Cons FaultThe grid voltage sample value between master and slave is not consistent.
  • Ground FaultThe ground connection is failed.
  • HW Bat Cur FaultBattery current high detected by hardware.
  • HW Bus Vol FaultBus voltage out of range detected by hardware.
  • HW Bus Volt FaultBus voltage out of range detected by hardware.
  • HW Inv Cur FaultOutput current high detected by hardware.
  • HW Pv Cur FaultPV input current high detected by hardware.
  • InconsistencyInconsistency fault
  • Inv EEPROM FaultThe inverter eeprom is fault.
  • Iso FaultThe isolation is failed.
  • Isolation FaultIsolation Fault - Check the impedance among PV (+), PV (-) and ground. Impedance should be >1Mohm. - Please seek for help from us if it cannot be detected or the impedance is <1Mohm.
  • M1 Close FaultThe grid relay M1 keep close.
  • M2 Close FaultThe grid relay M2 keep close.
  • Main Relay OpenThe grid relay keeps open.
  • MDSP Smpl FaultThe master sample detection circuit is failed.
  • MDSP SPI FaultThe communication between master and slave is fail.
  • Meter Lost FaultThe communication between meter and inverter is interrupted.
  • MS Comm LostMaster communication lost
  • OCPOver current protection activated
  • Over Load FaultOver load in on grid mode.
  • Over TempOver temperature fault
  • PLL FaultPhase locked loop fault
  • PLL_OverTimeThree-phase system access single-phase AC.
  • PV OVPPV open voltage over limit
  • Pv Volt FaultPV voltage out of range.
  • PvCon Dir FaultThe PV connection is reversed.
  • Rc Cons FaultThe residual current sample value between master and slave is not consistent.
  • RDSP Smpl FaultThe slave sample detection circuit is failed.
  • RDSP SPI FaultThe communication between master and slave is fail.
  • Relay FailRelay failure detected
  • Res Cur FaultThe residual current is high.
  • Res Cur HW FaultResidual current detection device is failed.
  • S1 Close FaultThe grid relay S1 keep close.
  • S2 Close FaultThe grid relay S2 keep close.
  • Sample FaultSampling fault detected
  • SCI FaultThe communication between master and manager is fail.
  • SPS faultSPS fault
  • SW Bat Cur FaultBattery current high detected by software.
  • SW Bus Vol FaultBus voltage out of range detected by software.
  • SW Bus Volt FaultBus voltage out of range detected by software.
  • SW Inv Cur FaultOutput current high detected by software.
  • SW Pv Cur FaultPV input current high detected by software.
  • Temp FaultThe inverter temperature is high.
  • V grid transientVoltage grid transient fault
  • VGridTransient FaultTransient grid voltage fault