These faults apply to the following sungrow products:
SBR096/128/160/192/224/256
SBH100/150/200/250/300/350/400
SH3.0RS/SH3.6RS/SH4.0RS/SH5.0RS/SH6.0RS
SH5.0RT/SH6.0RT/SH8.0RT/SH10RT
SH5T/6T/8T/10T/12T/15T/20T/25T
In the event of Fault Codes 932, 933, 934, 935, 937, 938, 939, 941, 942, 964 being informed through the App, the following corrective measures shall be taken:
Overvoltage alarm (Code 932)
Fault name | Overvoltage alarm (fault code: 932) |
Fault type | Alarm |
Fault condition | The alarm will be triggered when the voltage value of the battery cell is higher than the voltage alarm threshold |
Steps and methods of troubleshooting | Under normal circumstances, the battery can automatically return to normal: 1. Check with the clamp meter, if there is still charging current when the battery is fully charged. If so, please check whether the allowable charging current of the battery is 0A. If it shows 0A, please report it to SUNGROW for analysis assistance 2. Measure whether the total voltage of the module is consistent with the output voltage of BMU sampling, if not, the BMU sampling is abnormal |
Overtemperature alarm (Code 933)
Fault name | Overtemperature alarm (fault code: 933) |
Fault type | Alarm |
Fault condition | The alarm is triggered when detected system temperature is above the protection threshold |
Steps and methods of troubleshooting | Generally, the inverter will run again after the temperature of the battery module returns to normal: 1. Check if installation clearance is in according to the installation manual. 2. Check whether the ambient temperature of the inverter is too high and whether the inverter is in a place with good ventilation. 3. Check whether the inverter is under direct sunlight. If so, please shade it properly 4. Measure whether the temperature in the module is consistent with the output temperature of BMU sampling, if not, the BMU sampling is abnormal |
Low temperature alarm (Code 934)
Fault name | Low temperature alarm (fault code: 934) |
Fault type | Alarm |
Fault condition | The alarm is triggered when detected system temperature is below the protection threshold |
Steps and methods of troubleshooting | 1. Shut down and disconnect the lithium-ion battery system, and wait for the ambient temperature to rise to the operating temperature range of the system before restarting and closing the battery system 2. Measure whether the temperature in the module is consistent with the output temperature of BMU sampling, if not, the BMU sampling is abnormal |
Charge/Discharge overcurrent alarm (Code 935)
Fault name | Charge/discharge overcurrent alarm (fault code: 935) |
Fault type | Alarm |
Fault condition | The alarm is triggered when the actual current value is higher than the threshold limit value during the battery charging and discharging process |
Steps and methods of troubleshooting | Under normal circumstances, the battery can automatically return to normal. 1. If the charge/discharge overcurrent alarm is given and the alarm is related to the system operation state, open APP to confirm whether the system operation current exceeds the rated value during the alarm. If so, stop the system. 2. Use a clamp meter to measure whether the charging/discharging current is consistent with the output current collected by the system. If not, change the switch box |
Code 937 (Battery pack voltage unbalance)
Fault name | Battery pack voltage unbalance(fault code: 937) |
Fault type | Alarm |
Fault condition | The battery itself, operating environment or the operation performed on the battery is abnormal.
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Steps and methods of troubleshooting | 1. User may ignore the battery alarm, and the battery can operate normally in this case. Be cautious.* 2. If overtemperature or low temperature actually exists, take ventilation measures or other measures. 3. If worrying about the potential risks, please contact the corresponding battery manufacture. |
*If possible, measure the voltage of each of the battery modules to ensure all module have the same voltage +- 0.5V. If the difference is higher please contact sungrow service.
Code 939 (Undervoltage Alarm)
Fault name | Undervoltage Alarm (fault code: 939) |
Fault type | Alarm |
Fault condition | The battery itself, operating environment or the operation performed on the battery is abnormal.
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Steps and methods of troubleshooting | 1. User may ignore the battery alarm, and the battery can operate normally in this case. Be cautious. 2. If overtemperature or low temperature actually exists, take ventilation measures or other measures. 3. If worrying about the potential risks, please contact the corresponding battery manufacture. |
Code 941 (Cell Voltage Imbalance Alarm)
Fault name | Cell Voltage Imbalance Alarm (fault code: 941) |
Fault type | Alarm |
Fault condition | The battery itself, operating environment or the operation performed on the battery is abnormal.
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Steps and methods of troubleshooting | 1. User may ignore the battery alarm, and the battery can operate normally in this case. Be cautious. 2. If overtemperature or low temperature actually exists, take ventilation measures or other measures. 3. If worrying about the potential risks, please contact the corresponding battery manufacture. |
Code 942 (Core temperature difference alarm)
Fault name | Core temperature difference alarm (fault code: 942) |
Fault type | Alarm |
Fault condition | The battery itself, operating environment or the operation performed on the battery is abnormal.
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Steps and methods of troubleshooting | 1. User may ignore the battery alarm, and the battery can operate normally in this case. Be cautious. 2. If overtemperature or low temperature actually exists, take ventilation measures or other measures. 3. If worrying about the potential risks, please contact the corresponding battery manufacture. |
Code 964 (Battery Internal Alarm):
Fault name | Battery Internal Alarm (Code 964) |
Fault type | Alarm |
Fault condition | The battery itself, operating environment or the operation performed on the battery is abnormal. |
Steps and method of troubleshooting | 1. User may ignore the battery alarm, and the battery can operate normally in this case. Be cautious. 2. If overtemperature or low temperature actually exists, take ventilation measures or other measures. 3. If worrying about the potential risks, please contact the corresponding battery manufacture. |
For further information, please download the user manual here.
This manual is intended for professional technicians who are responsible for installation, operation, maintenance and troubleshooting of inverters, and users who need to check inverter parameters. The inverter must only be installed by professional technicians.
The professional technician is required to meet the following requirements:
Know electronic, electrical wiring and mechanical expertise, and be familiar with electrical and mechanical schematics.
Have received professional training related to the installation, commissioning and troubleshooting of electrical equipment.
Be able to quickly respond to hazards or emergencies that occur during installation, commissioning and troubleshooting.
Be familiar with local standards and relevant safety regulations of electrical systems.
Read this manual thoroughly and understand the safety instructions related to operations.