Voltage difference between AC phases exceeds permitted imbalance threshold. Three-phase connected systems only. Auto-reconnects when balance restored. Displayed fault ID: 017.
Common causes
Genuine phase voltage imbalance on utility gridImbalance protection threshold set too tight
What to check
STEP 1
Wait — inverter auto-reconnects. If recurring, measure voltage on all three AC phases at inverter terminal.
STEP 2
If phases differ greatly, contact DNO/DNSP. If within DNO allowance, adjust grid voltage imbalance parameter via App or LCD.
Escalate if
Phase voltages confirmed balanced but fault persists — contact Sungrow support
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