Sungrow Inverter Fault Codes

Sungrow inverters have earned their reputation as one of the best in the market, thanks in part to their adaptability to Australian conditions. Yet, no system is immune to occasional hitches. When these arise, your Sungrow inverter will display a fault code either on its panel or through its online portal. These codes are essentially a diagnostic tool, giving you a clearer picture of any irregularities.

In this guide, we’ll decode the Sungrow inverter fault codes for you. Each section will present the code number, describe its meaning, outline the behaviour you may notice, and provide actionable remedies.

Fault Code	Description	Troubleshooting
0002	The grid voltage exceeds inverter allowable upper limit.	1. Check the voltage of the grid. 2. If the grid voltage exceeds the permissible range of inverter protection parameters, ask utility grid company for solution. 3. If the grid voltage is within the permissible range, contact Sungrow Service Dept.
0003	Grid transient voltage exceeds the permissible range	1. This is a short-term fault due to grid condition. Wait a moment for inverter recovery. 2. If the fault still exists, please contact Sungrow Service Dept.
0004	The grid voltage is below inverter’s allowable lower limit.	1. Check the grid voltage. 2. If the grid voltage exceeds the permissible range of inverter protection parameters, ask utility grid company for solution. 3. If the grid voltage is within the permissible range, contact Sungrow Service Dept.
0005	The grid voltage is too low.	1. This is a short-term fault due to grid condition. Wait a moment for inverter recovery. 2. If the fault still exists, please contact Sungrow Service Dept.
0006	The AC output current exceeds inverter allowable upper limit.	1. The inverter will resume if the output current falls below the protection value. 2. If the fault still exists, please contact Sungrow Service Dept.
0007	Transient AC overcurrent	1. The inverter will self-recover after several seconds. 2. If the fault still exists, please contact Sungrow Service Dept.
0008	The grid frequency exceeds inverter allowable upper limit.	1. Check the grid frequency. 2. If the grid frequency exceeds the permissible range of inverter protection parameters, ask utility grid company for solution. 3. If the grid frequency is within the permissible range, contact Sungrow Service Dept.
0009	The grid frequency is below the inverter allowable lower limit.
0010	Islanding	1. Check whether AC circuit breaker is triggered. 2. Check whether AC cables are all firmly connected. 3. Check whether grid is not in service. 4. If all conditions are OK and this fault still occurs in the LCD screen, contact Sungrow Service Dept.
0011	The DC component of AC current exceeds inverter limit.	1. Wait a moment for inverter recovery. 2. If the fault occurs repeatedly, contact Sungrow Service Dept.
0012	A failure current is detected.	1. Check the PV strings for ground fault. 2.  If the fault occurs repeatedly, contact Sungrow Service Dept.
0014	The average grid voltage exceeds the permissible range for over 10 minutes.	1. Wait a moment for inverter recovery. 2. Check the voltage of the grid. If the grid voltage exceeds the permissible range of inverter protection parameters, ask utility grid company for solution. 3. If the fault occurs repeatedly, contact Sungrow Service Dept.
0015	The grid voltage exceeds the permissible range	1. Check the model of the AC cables. 2.Wait a moment for inverter recovery. 3. If the grid voltage exceeds the permissible range of inverter protection parameters, ask utility grid company for solution. 4.  If the fault occurs repeatedly, contact Sungrow Service Dept.
0016	The bus voltage or power is high.	1. Wait a moment for inverter recovery. 2. If the fault occurs repeatedly, contact Sungrow Service Dept.
0019	The transient bus voltage is high.	1. Wait a moment for inverter recovery. 2. If the fault occurs repeatedly, contact Sungrow Service Dept.
0020	The bus voltage is high.	1. Wait a moment for inverter recovery. 2. If the fault occurs repeatedly, contact Sungrow Service Dept.
0021	PV1 input overcurrent is detected	Check the layout and the wiring of PV1 input.
0022	PV2 input overcurrent is detected	Check the layout and the wiring of PV2 input.
0036	The temperature of radiator is too high.	1. Check whether the placement of inverter is correctly. 2. Check whether the inverter operating ambient temperature is more than the range indicated in the specification. 3. Check whether the AC output power exceeds the nominal power. 4. If the fault still exists, please contact Sungrow.
0037	The internal temperature of inverter is too high
0038	Relay fault is detected	1. Wait a moment for inverter recovery. 2. If the fault occurs repeatedly, contact Sungrow Service Dept.
039	The insulation resistance is low. (ISO-flt)	1. Check whether the positive and negative of PV panels is short-circuited with ground lead. 2.  Wait a moment for inverter recovery. 3. If the fault occurs repeatedly, contact Sungrow Service Dept.
041	Leakage current self-test abnormality	1. Wait a moment for inverter recovery. 2. If the fault occurs repeatedly, contact Sungrow Service Dept.
047	The PV configuration mode set in the phone application interface is not in accordance with the configuration in the connection cabinet.	1. Disconnect the inverter. 2. Re-select PV configuration mode and re-connect PV strings.
048	Sampling channel failure	1. Wait a moment for inverter recovery. 2. If the fault occurs repeatedly, contact Sungrow Service Dept.
053	Auxiliary DSP detects grid voltage exceeds set protection value	1. Check the grid voltage. 2. If the grid voltage exceeds the permissible range of inverter protection parameters, ask utility grid company for solution. 3. If the grid voltage is within the permissible range, contact Sungrow Service Dept.
054	Auxiliary DSP detects grid frequency exceeds set protection value	1. Check the grid frequency. 2. If the grid frequency exceeds the permissible range of inverter protection parameters, ask utility grid company for solution. 3. If the grid frequency is within the permissible range, contact Sungrow Service Dept.
056	Auxiliary DSP detects grid leakage current exceeds set protection range	1. Check whether there is a grounded fault of the PV string. 2.  If the fault occurs repeatedly, contact Sungrow Service Dept.
057	Auxiliary DSP AC current sampling channel anomaly	1. Wait a moment for inverter recovery. 2. If the fault occurs repeatedly, contact Sungrow Service Dept.
058	Auxiliary DSP detects AC current DC injection exceeds inverter set protection range	1. Wait a moment for inverter recovery. 2. If the fault occurs repeatedly, contact Sungrow Service Dept.
059	Main and auxiliary DSP communication anomaly	1. Wait a moment for inverter recovery. 2. If the fault occurs repeatedly, contact Sungrow Service Dept.
060	Main and auxiliary DSP sampling difference	1. Wait a moment for inverter recovery. 2. If the fault occurs repeatedly, contact Sungrow Service Dept.
070	Fans are defective	Stop the inverter and disconnect the AC and DC cables. Check whether the fan duct has been blocked. If not, replace fans.
087	Arc self-detection anomaly warn	Wait a while. Contact Sungrow if device is still in self-detection warn state.
088	Arc anomaly fault	1. Stop the inverter and disconnect the AC and DC cables. Check cable connection for aging and looseness. Re-power on and remove the arc warn manually. 2. Contact Sungrow if this fault still occurs.
089	Arc detection OFF warn	Remove the warn by enable arc detection function or keep the warn by closing arc detection function.
100	The AC output current exceeds inverter protection limit.	1. The inverter will resume if the output current falls below the protection value. 2. If the fault still exists, please contact Sungrow Service Dept.
101	The grid frequency exceeds inverter allowable upper limit.	1. Check the grid frequency. 2. If the grid frequency exceeds the permissible range of inverter protection parameters, ask utility grid company for solution. 3. If the grid frequency is within the permissible range, contact Sungrow Service Dept.
102	The grid frequency is below the inverter allowable lower limit.
106	The inverter is not grounded	Check whether there is a reliable inverter grounding line, if thre is access to the ground, and the fault still exists, please contact Sungrow Service Dept.
200	The bus voltage is high.	1. Wait for inverter recovery after bus voltage lower. 2.  If the fault occurs repeatedly, contact Sungrow Service Dept.
201	The bus voltage is too low.	1. Wait a moment for inverter recovery. 2.  If the fault occurs repeatedly, contact Sungrow Service Dept.
202	PV current overcurrent	1. Wait for inverter recovery after DC current is reduced. 2. If the fault occurs repeatedly, contact Sungrow Service Dept.
205	AC output replay abnormal	1. Wait a moment for inverter recovery. 2.  If the fault occurs repeatedly, contact Sungrow Service Dept.
307	DC power is too high	Check whether the configuration of PV is in the range indicated in the specification. If the fault occurs repeatedly, contact Sungrow Service Dept.