Learn how to troubleshoot and resolve SMA error code 6406 related to DC overcurrent.
SMA error code 6406 indicates a DC overcurrent condition on input A, which can lead to system shutdown.
To prevent DC overcurrent, ensure proper wiring and check for any short circuits or component failures.
The SMA inverter triggers error 6406 when it detects a DC overcurrent on input A. This condition may arise from an imbalance in current flow, often caused by a short circuit or excessive current draw exceeding the inverter's rated input capacity. The inverter continuously monitors voltage and current levels through its internal sensors. If the current exceeds safe operational limits, the inverter will automatically shut down to prevent damage, ensuring compliance with safety protocols outlined in the National Electrical Code (NEC).
Homeowners may observe the inverter displaying an error 6406, typically accompanied by a steady red LED indicator. Monitoring apps may show a sudden drop in energy production, indicating a fault condition. The inverter may also be non-responsive to commands during this state.
Always consult a licensed electrician or certified solar installer when troubleshooting electrical components to ensure safety and compliance with all applicable codes.
To avoid future occurrences of error 6406, regularly inspect the solar array for physical damage, ensure proper cleaning to prevent soiling, and verify that all connections are secure and corrosion-free. Conduct routine maintenance checks on bypass diodes and monitor string configurations to ensure they remain balanced.