| 1 |
Blank or Unresponsive Display |
The screen is dark, frozen, or does not respond to buttons. The inverter may or may not still be operating.
|
Loss of auxiliary power, open DC or AC isolator, tripped protective device, internal control-board fault, or a failed display connection.
|
Confirm safe AC and battery isolation-switch positions. Check whether status LEDs, fans, or communication devices are active. Inspect only accessible external wiring and protective devices.
|
Restore the correct power path if a breaker or isolator has opened and the cause is known. Perform a controlled restart according to the installation manual. If power is present but the display remains inactive, arrange qualified service.
|
High |
| 2 |
Grid Overvoltage or Undervoltage |
A grid-voltage error appears, grid charging stops, or the inverter repeatedly disconnects and reconnects.
|
Utility voltage outside the configured operating range, voltage drop in long or undersized cables, loose terminals, or incorrect regional settings.
|
Measure AC voltage at the inverter terminals and at the distribution board with suitable equipment. Compare readings with the permitted range in the applicable grid code and installation documentation.
|
Have an electrician tighten or repair connections, assess cable sizing, and verify settings. If voltage is outside the utility range, report the issue to the network operator instead of changing protection limits without authorization.
|
High |
| 3 |
PV Input Overvoltage |
The inverter refuses to start, shows a PV overvoltage message, or shuts down during periods of high solar irradiance.
|
Too many modules connected in series, cold-weather string voltage exceeding the maximum input rating, incorrect string design, or wiring errors.
|
Compare the measured open-circuit voltage of each string with the inverter's maximum DC input voltage. Recalculate the string voltage using the module temperature coefficient and the lowest expected site temperature.
|
Do not reconnect a string that exceeds the permitted voltage. A qualified solar professional should redesign the string configuration, correct wiring, and verify polarity before commissioning.
|
High |
| 4 |
Battery Communication Failure |
Battery state of charge is unavailable, charge and discharge are disabled, or the display reports a communication timeout.
|
Loose or incorrectly terminated communication cable, incompatible protocol or baud-rate setting, battery management system shutdown, or insufficient control power.
|
Inspect the communication cable and connectors without working on live circuits. Confirm the selected battery type and protocol. Check whether the battery management system is awake and reporting a normal status.
|
Reconnect or replace the communication lead with the specified cable type, select the correct protocol, and restart the battery and inverter in the documented sequence. Do not bypass battery management protections.
|
High |
| 5 |
Battery Overvoltage or Undervoltage |
Battery charging or discharging stops, the inverter enters standby, or a battery protection alarm is displayed.
|
Battery state of charge outside the permitted range, cell imbalance, low temperature, incorrect battery-voltage settings, or a battery management system protection event.
|
Review battery voltage, state of charge, temperature, and alarm history. Confirm that the battery chemistry and voltage class match the configured settings. Check for visible damage or abnormal heating.
|
Allow the battery management system to complete its protective response. Correct configuration errors only within the approved limits. If the alarm returns, stop operation and contact a qualified battery technician for testing.
|
High |
| 6 |
Ground-Fault or Insulation-Resistance Alarm |
The inverter reports an insulation fault, residual-current warning, or earth-fault condition, often after rain or washing.
|
Damaged PV cable insulation, wet connectors, pinched conductors, moisture inside a junction box, or an earthing problem.
|
Isolate the system using the approved procedure. Look for damaged cables, water ingress, and poorly fitted connectors. Insulation-resistance testing should be performed only by a qualified person using the correct test voltage.
|
Keep the affected circuit isolated until the fault is located and repaired. Replace damaged cables or connectors, correct water ingress, and repeat electrical safety tests before reconnecting the system.
|
High |
| 7 |
Overtemperature Warning |
Output power is reduced, the cooling fan runs continuously, or the inverter shuts down during high-load or high-temperature periods.
|
Blocked ventilation, direct solar exposure, high ambient temperature, dust buildup, excessive load, or a failed fan or temperature sensor.
|
Verify required clearance around the enclosure. Check air inlets and outlets for dust or obstruction. Review operating temperature and load history, and listen for abnormal fan noise.
|
Improve ventilation and shade where permitted, remove external obstructions, and clean the enclosure according to the maintenance instructions. A failed fan or sensor should be replaced by qualified service personnel.
|
Medium |
| 8 |
Monitoring Data Missing or Delayed |
The local display works, but the web portal or mobile dashboard shows no recent data, flat-line readings, or an incorrect last-update time.
|
Wi-Fi or Ethernet interruption, weak wireless signal, router replacement, incorrect network credentials, cloud-service interruption, or a failed data logger.
|
Check the inverter's communication icon and local network status. Confirm that the router has internet access and that the data logger is powered. Compare local inverter readings with remote data timestamps.
|
Restore network connectivity, update the stored network credentials, or reconnect the data logger according to the instructions. Avoid factory-resetting the inverter unless configuration data has been recorded and a reset is necessary.
|
Medium |
| 9 |
Firmware Update Failed or Interrupted |
An update remains pending, stops partway through, reports a validation error, or leaves the inverter in a restricted operating mode.
|
Unstable internet or power supply, incorrect firmware package, insufficient storage, incompatible hardware revision, or interruption during the update process.
|
Record the displayed error and current firmware version. Confirm that the package is intended for the exact inverter model and hardware revision. Check network stability and system event logs.
|
Do not switch off the inverter during an active update unless the official recovery procedure requires it. Retry only with a stable connection and the correct package. If recovery mode is required, use qualified service support to avoid disabling protective functions.
|
High |
| 10 |
Incorrect Time, Energy Totals, or Operating Mode |
Scheduled charging starts at the wrong time, daily energy resets unexpectedly, or the display shows inconsistent import, export, and battery values.
|
Incorrect time zone, daylight-saving setting, meter orientation, current-transformer direction, reset date, or an operating mode that conflicts with the intended schedule.
|
Compare the inverter clock with local time. Review time zone, daylight-saving, tariff, and battery schedule settings. Verify meter direction and compare displayed power with a trusted electrical measurement.
|
Correct the clock and schedule settings, then verify the selected self-consumption, backup, or time-of-use mode. A qualified electrician should correct meter wiring or sensor orientation and confirm readings under load.
|
Medium |
