How can I reset MPPT 250/70 ??? I have an error message Nr. 0067. Thank you.
You can read information on error code's here:
You don't describe your system, if it has a battery with a bms, error 67 is shown when the bms is not present. to protect the batteries the MPPT won't charge when the bms is not seen.
If you don't have a bms, you can reset the unit as described in the document.