Felicity E-CHO-SI8KS2 Error Codes: Causes & Fixes (27 codes)

This is the complete fault table for the Felicity E-CHO-SI8KS2 Inverter — all 27 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.

Fault(27)— output stops · red LED solid

Fault codes (27)output stops · red LED solid

Grid Volt Low.

Fault

CauseAC grid voltage has dropped below the inverter's safe operating range. Most commonly caused by utility voltage sag, undersized wiring between the meter and the inverter, or loose AC terminal connections.

Recommended fixMeasure the AC voltage at the inverter terminals with a multimeter. If voltage is consistently below the inverter's minimum threshold (typically 184 VAC for 230 V systems), contact your utility provider. Verify all AC wiring is correctly sized for the inverter's rated current, and retighten the grid terminal block.

Source:E-CHO-SI8KS2-Operation-Manual.pdf

Grid Volt High.

Fault

CauseAC grid voltage has exceeded the inverter's safe operating range. Usually caused by utility overvoltage, a long cable run with excess voltage rise from inverter export, or an open neutral on a multi-phase install.

Recommended fixMeasure AC voltage at the inverter terminals. If the reading is consistently above the inverter's maximum threshold (typically 264 VAC for 230 V systems), contact your utility. Confirm neutral continuity from the inverter back to the distribution panel. Shortening the AC cable run between the inverter and the point of common coupling also reduces voltage rise.

Source:E-CHO-SI8KS2-Operation-Manual.pdf

Grid Freq Low.

Fault

CauseGrid frequency has fallen below the regional minimum (typically 47-49 Hz for 50 Hz grids, 57-59 Hz for 60 Hz grids). The inverter trips offline to comply with anti-islanding standards.

Recommended fixThis is almost always a utility-side issue and clears automatically when grid frequency returns to normal. If the fault persists during stable grid conditions, verify the inverter's grid code setting matches your region (50 Hz vs 60 Hz). Have an electrician confirm there is no isolated/islanded section of the local grid.

Source:E-CHO-SI8KS2-Operation-Manual.pdf

Grid Freq High.

Fault

CauseGrid frequency has risen above the regional maximum. Frequency excursions usually indicate a major generation/load imbalance on the utility side.

Recommended fixWait for the grid to stabilize — the inverter reconnects automatically once frequency returns to spec. Persistent faults during otherwise normal operation usually indicate a wrong grid-code setting; confirm the inverter is configured for your country/utility.

Source:E-CHO-SI8KS2-Operation-Manual.pdf

Bus Volt Low.

Fault

CauseInternal DC bus voltage has fallen below the inverter's minimum operating threshold. Common causes: PV string voltage too low (early morning, heavy shading, snow/sand cover), faulty MPPT tracker, or aging DC link capacitors.

Recommended fixCheck PV string open-circuit voltage in full sun. If below the inverter's minimum start-up Voc, you may have damaged panels, a broken string, or reverse-polarity wiring. If string voltage is normal, the fault is internal — power down the inverter, wait 5 minutes, and restart. Persistent faults require service.

Source:E-CHO-SI8KS2-Operation-Manual.pdf

Bus Volt High.

Fault

CauseInternal DC bus voltage has exceeded safe limits. Usually caused by PV string voltage near the inverter's maximum DC input rating, or by a transient grid disconnection that leaves the bus charged.

Recommended fixVerify total PV string voltage (Voc at coldest expected ambient) is below the inverter's maximum DC input rating. Common in cold mornings when Voc spikes 15-20% above STC value. Reduce panels per string if you are near the limit. For transient faults that self-clear, no action is needed.

Source:E-CHO-SI8KS2-Operation-Manual.pdf

Isolation Fault.

Fault

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 fixDisconnect the PV strings and measure insulation resistance between PV+ and ground, PV- and ground, and PV+ to PV-. Any resistance below 1 MΩ indicates moisture or damaged insulation. Inspect MC4 connectors for water ingress. Reconnect each string one at a time to isolate the faulty string.

Source:E-CHO-SI8KS2-Operation-Manual.pdf

Input Curr Over.

Fault

CauseThe PV input current exceeded the inverter's allowed input range: the array is delivering more current than the input stage is rated for, typically from too many parallel strings or a brief over-irradiance spike.

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:E-CHO-SI8KS2-Operation-Manual.pdf

Hard Curr Over.

Fault

CauseThe hardware over-current protection circuit tripped: current through the power stage rose beyond the hardware limit faster than software protection could act, pointing to a sudden load surge, an output short, or a power-stage fault.

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:E-CHO-SI8KS2-Operation-Manual.pdf

Inv Curr Over.

Fault

CauseThe inverter output current exceeded its over-current protection limit, usually from a surge or short on the output side, otherwise an internal power-stage fault.

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:E-CHO-SI8KS2-Operation-Manual.pdf

Inv DCI Over.

Fault

CauseThe DC component of the inverter's AC output current exceeded the allowed injection limit. Excess DC offset in the output usually indicates drifting current measurement or power-stage asymmetry.

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:E-CHO-SI8KS2-Operation-Manual.pdf

Amb Temp Over.

Fault

CauseThe ambient temperature measured by the inverter is above its permitted operating limit: a hot installation location, direct sunlight, or inadequate ventilation around the unit.

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:E-CHO-SI8KS2-Operation-Manual.pdf

Sink Temp Over.

Fault

CauseThe power-stage heat sink exceeded its temperature limit: sustained high output in a hot or poorly ventilated location, or blocked airflow around the housing.

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:E-CHO-SI8KS2-Operation-Manual.pdf

AC Relay Fault.

Fault

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 fixThis requires service — the relay assembly is not user-replaceable. Record the exact fault code and contact your installer or the manufacturer's service line. Do not bypass any safety interlock.

Source:E-CHO-SI8KS2-Operation-Manual.pdf

Remote Off.

Fault

CauseThe inverter was shut down by a remote or background instruction: a stop command from the monitoring platform, app, or grid operator rather than a hardware fault.

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:E-CHO-SI8KS2-Operation-Manual.pdf

SPI Comm Fault.

Fault

CauseCommunication has been lost between the inverter and a peripheral device — typically a battery BMS, smart meter, or external monitoring dongle.

Recommended fixVerify the communication cable (CAN/RS485/Modbus) is correctly seated and the right pinout is used. Check baud rate and protocol settings in both devices match. Reseat the dongle/comms module. For BMS comms, confirm the battery is powered on and not in deep-discharge protection.

Source:E-CHO-SI8KS2-Operation-Manual.pdf

GFCI over Fault.

Fault

CauseLeakage (residual) current to ground exceeded the GFCI protection limit. The most common causes are moisture in PV connectors or damaged cable insulation creating a current path to ground.

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:E-CHO-SI8KS2-Operation-Manual.pdf

GFCI Dev. Fault.

Fault

CauseThe GFCI (leakage-current) monitoring device failed its self-test. The sensor itself is faulty, and the inverter refuses to operate without working ground-fault protection.

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:E-CHO-SI8KS2-Operation-Manual.pdf

Volt Cons Fault.

Fault

CauseThe master and slave voltage-sampling channels disagree beyond tolerance, so the inverter cannot trust its voltage measurement. This is an internal sampling-circuit fault.

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:E-CHO-SI8KS2-Operation-Manual.pdf

Curr inconsiste.

Fault

CauseThe master and slave current samples are inconsistent beyond tolerance. This is an internal current-sampling fault.

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:E-CHO-SI8KS2-Operation-Manual.pdf

Freq inconsiste.

Fault

CauseThe master and slave frequency measurements are inconsistent beyond tolerance. This is an internal frequency-sampling fault.

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:E-CHO-SI8KS2-Operation-Manual.pdf

GFCI inconsiste.

Fault

CauseThe master and slave leakage-current (GFCI) samples are inconsistent beyond tolerance. This is an internal GFCI-sampling fault.

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:E-CHO-SI8KS2-Operation-Manual.pdf

Soft start fail.

Fault

CauseThe inverter failed its soft-start sequence: the power stage could not ramp up in a controlled way at startup, which points to an internal component fault.

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:E-CHO-SI8KS2-Operation-Manual.pdf

DSP Comm Fault.

Fault

CauseCommunication has been lost between the inverter and a peripheral device — typically a battery BMS, smart meter, or external monitoring dongle.

Recommended fixVerify the communication cable (CAN/RS485/Modbus) is correctly seated and the right pinout is used. Check baud rate and protocol settings in both devices match. Reseat the dongle/comms module. For BMS comms, confirm the battery is powered on and not in deep-discharge protection.

Source:E-CHO-SI8KS2-Operation-Manual.pdf

Login Fault.

Fault

CauseAn internal login/registration handshake failed: the control firmware could not bring the affected module online.

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:E-CHO-SI8KS2-Operation-Manual.pdf

Power is zero.

Fault

CauseThe inverter is running but output power is zero: there is no usable PV input (night, disconnected or heavily shaded strings) or output is being held at zero by an export limit or remote instruction.

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:E-CHO-SI8KS2-Operation-Manual.pdf

Clock Warn.

Fault

CauseThe internal real-time clock is unreliable because its backup button battery is low, so the inverter may lose time-keeping when powered down.

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:E-CHO-SI8KS2-Operation-Manual.pdf

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Common questions about E-CHO-SI8KS2 error codes

What is the difference between a fault and a warning on the E-CHO-SI8KS2?: A fault cuts the unit's output and the red LED stays solid — this page lists 27 of them for the E-CHO-SI8KS2. The E-CHO-SI8KS2 manual defines no separate warning table — every listed code stops operation. Resolve the cause of a fault before restarting; warnings can usually be cleared while the unit runs.
Does this page apply to other Felicity models?: No — this table was transcribed specifically from the E-CHO-SI8KS2 manual. Other Felicity devices have their own pages; start from the error-code hub to find the one matching the model number on your unit's label.
Where do these codes come from?: Every entry was transcribed from E-CHO-SI8KS2-Operation-Manual.pdf — Felicity's official documentation. Each row cites its source manual (and page where printed), so you can verify the wording before acting on it.

Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.