This is the complete fault table for the Felicity IVCM1012 PRO Inverter family — 26 codes shared by 3 model numbers, transcribed from the official manual. 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.
CauseThe charging current from the PV input exceeded the charger stage's protection limit: the array is delivering more current than the charging circuit is rated to handle.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:ICM.pdf· page 13
CauseThe PV charger stage has overheated above its protection limit, typically because the unit's airflow is blocked or the ambient temperature is too high.
Recommended fixCheck whether the air flow of the unit is blocked or whether the ambient temperature is too high.
Source:ICM.pdf· page 13
CauseThe solar array voltage at the PV input is above the unit's maximum allowed input voltage, usually because too many panels are wired in series for this input.
Recommended fixPlease check the voltage of the solar panel, it should be less than 95V. if the voltage is ok, please contact your installer.
Source:ICM.pdf· page 13
The PV relay voltage is abnormal.
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 fixInternal components failed. Restart the unit, if the error persists, contact the repair center.
Source:ICM.pdf· page 13
Battery voltage is too high.
CauseThe measured battery voltage is above the allowed maximum for the configured system voltage: either an external source is overcharging the battery, or an internal measurement or charging component has failed.
Recommended fixInternal components failed. Restart the unit, if the error persists, contact the repair center.
Source:ICM.pdf· page 13ICM.pdf· page 13
Fan 1 is locked.
CauseInternal cooling fan failure detected. Often caused by dust buildup, bearing wear, or debris fouling the fan blades.
Recommended fixCheck if the Fans wiring connected well. Replace the fan.
Source:ICM.pdf· page 13
Fan 2 is locked.
CauseInternal cooling fan failure detected. Often caused by dust buildup, bearing wear, or debris fouling the fan blades.
Recommended fixCheck if the Fans wiring connected well. Replace the fan.
Source:ICM.pdf· page 13
CauseThe connected load is drawing more power than the inverter's rated output capacity.
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:ICM.pdf· page 13
CauseThe battery voltage has dropped below the low-battery threshold: the battery is discharged and needs charging.
Recommended fixThe battery voltage is too low, it should be charging.
Source:ICM.pdf· page 13
The communication between the primary and secondary cpus is faulty.
CauseCommunication has been lost between the inverter and a peripheral device — typically a battery BMS, smart meter, or external monitoring dongle.
Recommended fixInternal components failed. Restart the unit, if the error persists, contact the repair center.
Source:ICM.pdf· page 13
CauseThe output was overloaded long enough to trip overload protection: the connected loads exceed what the inverter can supply continuously.
Recommended fixReduce the loads and Restart the machine.
Source:ICM.pdf· page 13
CauseA short circuit was detected on the AC output: a wiring fault or a failed appliance pulling far more current than any normal load.
Recommended fixCheck if wiring is connected well and remove abnormal load.
Source:ICM.pdf· page 13
OP (output) current sensor failed.
CauseThe output current sensor has failed, so the inverter can no longer measure its output current reliably. This is an internal component fault.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:ICM.pdf· page 13
Output voltage is too low.
CauseThe AC output voltage sagged below the allowed range, most often because a heavy load is dragging the output down, otherwise an internal voltage-regulation fault.
Recommended fixReduce the connected load. Restart the unit, if the error persists, contact the repair center.
Source:ICM.pdf· page 14
Output voltage is too high.
CauseThe AC output voltage rose above the allowed range. This points to an internal voltage-regulation fault in the inverter stage.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:ICM.pdf· page 14
CauseThe inverter stage current exceeded its software protection limit: the connected loads, or a startup surge from motor or compressor equipment, are drawing more current than the rating.
Recommended fixReduce the connected load by switching off some equipment.
Source:ICM.pdf· page 14
The inverter hardware current is too large.
CauseThe hardware over-current protection on the inverter stage tripped: a sudden current spike beyond the hardware limit, typically a load surge or an output fault.
Recommended fixReduce the connected load by switching off some equipment.
Source:ICM.pdf· page 14
The soft start of the inverter voltage fails.
CauseThe inverter output voltage failed to ramp up during its soft-start sequence. This is an internal component fault in the inverter stage.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:ICM.pdf· page 14
The inverter current sensor is faulty.
CauseThe inverter-stage current sensor is faulty and its readings can no longer be trusted. This is an internal component failure.
Recommended fixContact the repair center.
Source:ICM.pdf· page 14
Bus voltage is too low.
CauseThe internal DC bus voltage fell below its minimum operating threshold: weak input power from the battery or PV side, or an internal bus-converter fault.
Recommended fixRestart the unit, if the error persists, contact the repair center.
Source:ICM.pdf· page 14
Bus voltage is too high.
CauseThe internal DC bus voltage exceeded its safe limit: an AC surge on the input, or failed internal components.
Recommended fixAC Surge or internal components failed. Restart the unit, if the error persists, contact the repair center.
Source:ICM.pdf· page 14
CauseThe DC bus failed to precharge during the soft-start sequence: failed internal components.
Recommended fixInternal components failed. Restart the unit, if the error persists, contact the repair center.
Source:ICM.pdf· page 14
Overtemperature occurs in radiator 1.
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 air flow of the unit is blocked or whether the ambient temperature is too high.
Source:ICM.pdf· page 14
Overtemperature occurs in radiator 2.
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 air flow of the unit is blocked or whether the ambient temperature is too high.
Source:ICM.pdf· page 14
CauseThe EEPROM that stores the unit's settings and calibration data failed a read/write check. This is an internal memory fault.
Recommended fixContact the repair center.
Source:ICM.pdf· page 14
DSP BootLoad is not written.
CauseThe DSP's bootloader firmware is missing or was never programmed, so the main processor cannot start. This is a factory or firmware fault that requires service.
Recommended fixContact the repair center.
Source:ICM.pdf· page 14
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.