Self-diagnosis / Device fault

What does 7702 mean?

The inverter has detected a general internal device fault through its self-diagnosis routine. This indicates a broad malfunction that prevents normal operation and requires further investigation to identify the specific component or system failure.

• Undetermined internal device fault.

Click steps to track your progress.

1. 1

   Verify AC grid voltage and frequency stability at the inverter's output terminals against nominal specifications.

2. 2

   Inspect all DC input wiring, string fuses, and connections for physical damage, corrosion, or looseness.

3. 3

   Measure individual PV string voltages and currents to confirm they are within the inverter's operating range and balanced.

4. 4

   Access the inverter's internal event log or diagnostic menu for more detailed sub-codes or specific fault messages related to the self-diagnosis routine.