•To adjust values of L00.02 & L00.03 until find a suitable value

To adjust L00.02 which default value is 3%, can reduce the value step by step to check (such as 2.5, 2, 1, 4, 5 ... ); If still not improved well, continue to adjust L00.03 which default value is 0.1, can increase the value step by step to check (such as 0.2, 0, 3, 0.5 ...)

•Adjust L00.10 which default value is 0.88, can increase or decrease to check

(1) Reduce the number of solar panels in series

(2) Reduce P09.01 deceleration time

Possible reason 1

Motor cable is too long lead to harmonics increased and bigger leakage current then Err25

Solution: To use a bigger power of inverter or add an external output reactor

Possible reason 2

The motor is blocked or the load is too heavy

Solution: clean the pump regularly to reduce the pump load