0203*
Grid voltage is too low (redundant monitoring)
SMA · SUNNY CENTRAL 500CP XT / 630CP XT Solar Inverter
What does 0203* mean?
The inverter's redundant monitoring system has detected an undervoltage condition on the utility grid. This indicates that the AC voltage has fallen below acceptable limits. The inverter will shut down and monitor the grid for 30 seconds before attempting to reconnect.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Check the grid voltage using a multimeter or power quality analyzer.
- 2
Inspect all grid connections for tightness and proper seating.
- 3
Verify the stability of the utility grid.
- 4
Ensure the external fuses are functional and correctly rated.
Verified technical data. Last updated: March 2026
Related Faults
Source: SMA SUNNY CENTRAL 500CP XT / 630CP XT Solar Inverter