What do Sofar ID01 GridOVP and ID03 GridOFP mean?

Short answer

On a SOFAR HYD-ES, ID01 GridOVP means grid voltage too high, ID02 too low, ID03 GridOFP frequency too high and ID04 too low. If occasional, the inverter recovers automatically when the grid is normal. If frequent, your installer checks the AC wiring and grid voltage; protection settings may change only with the network operator's approval.