Fault Reasons：Inverter will show “Grid Frequency Fault” when detected the AC frequency is out of range of selected country’s limitation.
Troubleshooting：
1. Check if the safety country selected is comply with the installation place.
2. The frequency fault is usually caused by the grid unstable, when the grid backs normal, this fault will be disappear as well.
3. Check the frequency on the display to see if it is within the range of limitation, if it is, please contact sunways after-sales team at service@sunways-tech.com or +86 400 9922 958 for help.