Input A defective, input B defective, input C defective
(en) The error messages DC-A/B/C defective indicate an incorrect string input. The green LED can remain illuminated as the inverter is still supplying through other inputs. In some firmware versions, the red LED also flashes.
If the inverter is no longer within the warranty period, you can check whether the strings can be distributed among the functional inputs, otherwise the device must be replaced.
Please contact SMA Service with the following information:
• Device type and serial number of the inverter
• If the device is in the warranty period: the warranty certificate
• LED blink code and error message
All work on the inverter and the cabling of the PV array must be carried out by an electrically qualified person. SMA accepts no liability for the information and solutions given in the Online Service Center. Additional information can be found in our Online Service Center’s terms and conditions of use.