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Solis (Ginlong) inverter alarm codes covering grid, insulation, temperature and hardware faults, with diagnostic next steps.
A reference compiled by Solar Analytica from publicly available Solis (Ginlong) inverter documentation. It lists the alarm and fault codes a Solis inverter may display, what each means, and the documented resolution steps. Safety note: for Solis units in particular, never open the DC isolators under load — wait for low irradiance and confirm string current is below 0.5 A first. Anything involving wiring or opening the unit is licensed-electrician work; if in doubt, contact your installer.
30 of 30 codes
The inverter shows no power on the LCD.
The inverter cannot start up — the LCD shows “initialising” continuously.
The grid voltage is above the allowed limit.
What to do
AC cable resistance may be too high — change to a larger cable size. Adjust the protection limit only if permitted by the electricity company. If the fault occurs frequently, contact your solar installer.
The grid voltage is below the allowed limit.
What to do
Use the user-define function to adjust the protection limit only if permitted by the electricity company. If the fault occurs frequently, contact your solar installer.
The grid frequency is above the allowed limit.
What to do
Use the user-define function to adjust the protection limit only if permitted by the electricity company. If the fault occurs frequently, contact your solar installer.
The grid frequency is below the allowed limit.
What to do
Use the user-define function to adjust the protection limit only if permitted by the electricity company. If the fault occurs frequently, contact your solar installer.
The AC connection polarity is incorrect.
What to do
Check the polarity of the AC connector. Contact your solar installer.
The DC connection polarity is reversed.
What to do
Check the polarity of the DC connector. Contact your solar installer.
No grid voltage is detected.
The DC input voltage is above the allowed limit.
What to do
Reduce the number of modules in series. Contact your solar installer.
The internal DC bus voltage is too high.
What to do
Restart the inverter and check the inductor and driver connections. Contact your solar installer.
The internal DC bus voltage is too low.
What to do
Restart the inverter and check the inductor and driver connections. Contact your solar installer.
Grid interference is affecting the inverter.
What to do
Restart the inverter. If unresolved, the power board may need replacing — contact your solar installer.
The grid current is above the allowed limit.
What to do
Restart the inverter. If unresolved, the power board may need replacing — contact your solar installer.
The IGBT current is above the allowed limit.
What to do
Restart the inverter. If unresolved, the power board may need replacing — contact your solar installer.
The measured grid impedance is high.
What to do
Use the user-define function to adjust the protection limit only if permitted by the electricity company. Contact your solar installer.
The DC input current is above the allowed limit.
What to do
Restart the inverter. Identify and remove the string feeding the faulty MPPT. If unresolved, the power board may need replacing — contact your solar installer.
The inverter failed to track the grid current.
What to do
Restart the inverter, or contact your solar installer.
The grid current sampling circuit failed.
What to do
Restart the inverter, or contact your solar installer.
The inverter is over temperature.
What to do
Check ventilation around the inverter and whether it is in direct sunlight in hot weather. If the fault recurs frequently, contact your solar installer.
A system fault occurred during initialisation.
What to do
Restart the inverter, or contact your solar installer.
Communication failed between the main and slave DSP.
What to do
Restart the inverter, or contact your solar installer.
The internal 12 V power supply has faulted.
What to do
Restart the inverter, or contact your solar installer.
Low insulation resistance between the PV array and ground.
What to do
Remove all DC inputs, then reconnect and restart the inverter one string at a time. Identify which string causes the fault and check its insulation. Contact your solar installer.
The leakage (residual) current exceeds the protection limit.
What to do
Check the AC and DC connections, and the cable connections inside the inverter. Contact your solar installer.
The relay self-check failed.
What to do
Restart the inverter, or contact your solar installer.
The DC injection into the AC output is too high.
What to do
Restart the inverter, or contact your solar installer.
The screen is off although DC is applied — the inverter may be internally damaged.
What to do
Do not turn off the DC switches — doing so under load will damage the inverter. Wait for irradiance to drop, confirm string current is below 0.5 A with a clip-on ammeter, then turn off the DC switches. Damage from incorrect operation is not covered by warranty. Contact your solar installer.
The AFCI (arc-fault) module failed its self-detection.
What to do
Restart the inverter, or contact a technician.
An arc was detected in the DC circuit.
What to do
Check the inverter connections for arcing, then restart the inverter. Contact your solar installer.
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