Self-diagnosis / Device fault

What does 7703 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 DC input voltage from PV strings at inverter terminals against nominal specifications.

2. 2

   Verify AC grid voltage and frequency at inverter output terminals within specified operating ranges.

3. 3

   Inspect inverter ventilation openings for obstructions, dust accumulation, and assess ambient temperature.

4. 4

   Perform a controlled power cycle of the inverter: safely disconnect AC, then DC; wait 5-10 minutes; then reconnect DC, followed by AC.

5. 5

   Check inverter's display or accessible diagnostic menu for additional specific fault codes, warning messages, or event logs.