Analysis: DC input voltage is too high
Solution: 
1. Turn off the DC & AC Switch,  and disconnect the DC solar string one by one, then, use the multimeter to check if the polarity direction and voltage of each string is correct, make sure it is in the rated range.
2. Restart inverter( by disconnect DC&AC switch, wait for 5 mins, then turn it on), observe if it can return to normal running.