Code Name Causes Possible Solutions oH2 External Overheat (H1-XX=B) An external device sent an oH2. Find the external device that output the overheat alarm. Remove the cause of the problem. Clear the Overheat Alarm (oH2) [H1-xx = B] that was set to MFDI terminals S1 to S6. Note: If the drive detects this error, the terminal set to H2-01 to H2-04 = 10 [MFDO Function Select = Alarm] will activate.