This is the complete fault table for the Felicity T-REX-10KHP3G01 Inverter — all 50 codes from the official manual on one page. On Felicity units, a fault code means the unit has cut its output and the red LED stays solid; a warning flashes the red LED while the unit keeps running.
Last checked against the official manuals on July 10, 2026.
Short circuit at the PV port.
CauseA short circuit was detected at the PV input — the array wiring presents a near-zero-resistance path, so the input stage shut down.
Recommended fixCheck if wiring is connected well.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 28
Short circuit on the inverter output.
CauseWiring fault or abnormal load on the output.
Recommended fixCheck if wiring is connected well and remove abnormal load.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 28
Input and output wiring is reversed.
CauseThe AC input and output wiring are swapped — the inverter detects source voltage on its output terminals, so it refuses to run until the connections are corrected.
Recommended fixConfirm that the input and output wiring is correct.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 28
Hardware-level over current detection at inverter port.
CauseA hardware protection circuit tripped on overcurrent at the inverter port. It acts independently of the firmware and reacts to fast transients such as load inrush or a surge.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 28
Ground leakage current fault.
CauseGround leakage current above the safety limit was detected — insulation or grounding on the PV or AC side is letting current return outside the normal conductors.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
PV string isolation resistance to ground below permitted threshold.
CauseA fault has been detected in the PV input stage — usually a short, ground fault, or isolation failure between the PV array and the inverter chassis. Wet connectors, damaged cable insulation, or moisture in a junction box are common causes.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
PV input voltage exceeds permitted range.
CauseToo many PV modules connected in series.
Recommended fixReduce the number of PV modules in series.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 28
Over current detected at the PV port.
CauseCurrent from the PV array exceeded the input stage's protection limit, so the inverter shut the PV input down.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 28
PV current sensor failure.
CauseThe PV current sensor returned an out-of-range or implausible reading, so the control board can no longer trust its PV current measurement.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 28
Battery voltage exceeds the permitted range.
CauseBattery specification or quantity does not meet requirements.
Recommended fixCheck if spec and quantity of batteries are meet requirements.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 28
Over current detected at Buckboost stage.
CauseThe buck-boost converter stage drew current above its protection limit.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 28
Buckboost current sensor failure.
CauseThe buck-boost current sensor returned an out-of-range or implausible reading, so the control board can no longer trust that stage's current measurement.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 28
Overload condition has timed out.
CauseConnected load is too high.
Recommended fixReduce the connected load by switching off some equipment.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 28
Output current sensor failed.
CauseThe output current sensor returned an out-of-range or implausible reading, so the control board can no longer trust its output-current measurement.
Recommended fixOutput current sensor failed.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 28
Output voltage is below permitted level.
CauseConnected load is too high.
Recommended fixReduce the connected load.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 28
Output voltage exceeds permitted level.
CauseThe inverter measured its own AC output voltage above the permitted range — an internal regulation fault rather than a wiring issue.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 28
Over current or surge detected by software protection.
CauseThe control software measured a current or surge on the power stage beyond its protection limit. The software trip catches sustained overcurrent, as opposed to the instantaneous hardware trip of F25.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 28
Inverter soft start procedure failed.
CauseInternal components failed.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 28
Abnormal DC component detected in inverter current.
CauseThe DC component riding on the inverter's output current exceeded the permitted limit — the output waveform has developed an asymmetry, typically from an output-stage or current-feedback fault.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 28
Inverter current sensor failure.
CauseThe inverter-stage current sensor returned an out-of-range or implausible reading, so the control board can no longer trust its inverter current measurement.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 28
DC bus voltage below permitted level.
CauseThe internal DC bus voltage fell below its operating range. The bus is regulated entirely inside the unit, so a persistent low reading points to an internal conversion-stage fault rather than external wiring.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 28
DC bus voltage exceeds permitted level.
CauseAC Surge or internal components failed.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
DC bus voltage unbalance detected.
CauseThe positive and negative halves of the internal DC bus have drifted apart in voltage — an internal balancing fault in the conversion stages.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
DC bus soft start procedure failed.
CauseInternal components failed.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
Heat sink over temperature.
CauseInverter internal temperature has exceeded the safe operating threshold. Causes include high ambient temperature, blocked cooling vents, failed cooling fan, or installation in direct sunlight.
Recommended fixCheck whether the ambient temperature is too high.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
Inner / internal temperature too high.
CauseAmbient temperature is too high.
Recommended fixCheck whether the ambient temperature is too high.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
Leakage current sensor failure.
CauseThe leakage current sensor returned an out-of-range or implausible reading, so the inverter can no longer verify that its leakage protection is working.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
Relay self-check failure.
CauseA safety relay inside the inverter has failed self-test or is stuck. The inverter is designed to refuse grid connection in this state, so this is not an issue you can clear with restart cycles.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
Loss of CAN bus communication data.
CauseCommunication has been lost between the inverter and a peripheral device — typically a battery BMS, smart meter, or external monitoring dongle.
Recommended fixCheck if communication cables are connected well and restart the inverter. if the problem remains, please contact your installer.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
CauseCommunication cables not connected well.
Recommended fixCheck if communication cables are connected well and restart the inverter. if the problem remains, please contact your installer.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
Synchronization data loss between paralleled units.
CauseCommunication cables not connected well.
Recommended fixCheck if communication cables are connected well and restart the inverter. if the problem remains, please contact your installer.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
Inverters in parallel have different firmware versions.
CauseInverter firmware versions are mismatched across parallel units.
Recommended fixUpdate all inverter firmware to the same version. Check the version of each inverter via LCD setting and make sure the CPU versions are same. if not, please contact your installer to provide the firmware to update. After updating, if the problem still remains, please contact your installer.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
Inverter settings differ between parallel units.
CauseParallel inverter settings differ between units.
Recommended fixThrough the LCD control button on the inverter, the parameters of the machine are set to the same as those of other machines. if the problem persists, contact the after-sales service.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
Parallel installation abnormality detected.
CauseThe parallel bus detects an installation that does not form a valid group — wrong cabling topology or an inconsistent set of units — so the system will not start.
Recommended fixContact after-sales service for installation technical guidance.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
Negative power protection triggered in parallel system.
CauseOne unit in the parallel group was detected absorbing power from the others (negative power flow), which the protection treats as a load-sharing fault and shuts down.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
EEPROM read/write failure.
CauseA read/write error occurred in the EEPROM that stores the inverter's settings and calibration, so the control board cannot reliably save or recall its configuration.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
CauseCommunication has been lost between the inverter and a peripheral device — typically a battery BMS, smart meter, or external monitoring dongle.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
CauseCommunication has been lost between the inverter and a peripheral device — typically a battery BMS, smart meter, or external monitoring dongle.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
PV parallel mode operation failure.
CausePV1 and PV2 paralleling configuration mismatch.
Recommended fixPlease confirm whether PV1 and PV2 need to be set to parallel mode. if not, please turn off this function in APP. if necessary, please confirm whether the wiring of PV1 and PV2 is connected to parallel mode.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
Temperature sensor disconnected or not detected.
CauseAn internal temperature sensor is no longer detected, so the inverter has lost a measurement it needs for thermal protection.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
CauseThe battery input circuit failed its self-check — the path between the battery terminals and the internal DC stage is not behaving as expected, which points to an internal fault rather than the battery itself.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
Number of battery packs in series has not been set.
CauseThe battery configuration is incomplete: the number of battery packs in series was never set, so the inverter cannot map the measured pack voltage to a valid battery range.
Recommended fixPlease set it correctly according to the number of battery packs used by the inverter.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 29
Low battery warning indicated on LCD with flashing fault LED.
CauseThe battery voltage is too low.
Recommended fixBattery should be charging.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 27
Overload warning. Audible alarm: beep twice every second.
CauseThe connected load exceeds the inverter's continuous output rating; the warning sounds before overload protection cuts the output.
Recommended fixPower down the inverter, wait 5 minutes for capacitors to discharge, then restart. If the fault recurs immediately or repeatedly, record the exact code and contact your installer or the manufacturer's service line.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 27
Phase sequence error warning.
CauseThe three-phase line order the inverter sees does not match the expected sequence, so it warns until the phase wiring is corrected.
Recommended fixPlease check the phase sequence to ensure that the line sequence is correct.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 27
Fault information warning.
CauseThe inverter has logged a fault event and is holding it for review; the warning stays active until the unit is restarted, which can be done from the Fsolar app.
Recommended fixCan restart through 'Fsolar app'.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 27
BMS does not permit the inverter to discharge the battery.
CauseThe battery's BMS is refusing discharge — it has signalled over the communication link that the pack must not be drawn down, and the inverter stops discharging automatically.
Recommended fixInverter will stop discharging battery automatically.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 27
BMS requires the inverter to charge the battery.
CauseThe battery's BMS has requested charging over the communication link — the pack needs energy, and the inverter starts charging automatically.
Recommended fixInverter will charge battery automatically.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 27
BMS firmware version mismatch.
CauseThe BMS firmware version does not match what the inverter's protocol expects, so battery communication cannot run reliably until the BMS is updated.
Recommended fixUpgrade the firmware of BMS.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 27
Number of battery packs in series has not been set.
CauseThe battery configuration is incomplete: the number of battery packs in series was never set, so the inverter cannot map the measured pack voltage to a valid battery range.
Recommended fixPlease set it correctly according to the number of battery packs used by the inverter.
Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf· page 27
Send us the code on your screen and a Felicity technician will reply with the exact steps for your unit. Support is free for life — a first diagnosis never needs a callout.
Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.