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ErrorLib — Industrial Fault Code Library

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0204*

Grid voltage is too low (standard monitoring)

SMA · SUNNY CENTRAL 500CP XT / 630CP XT Solar Inverter

What does 0204* mean?

The inverter's standard 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. 1

    Check the grid voltage using a multimeter or power quality analyzer.

  2. 2

    Inspect all grid connections for tightness and proper seating.

  3. 3

    Verify the stability of the utility grid.

  4. 4

    Ensure the external fuses are functional and correctly rated.

Browse all codes in this manual (29)
Verified technical data. Last updated: April 2026

Related Faults

0103*Grid voltage is too high (redundant monitoring)0104*Grid voltage is too high (standard monitoring)0203*Grid voltage is too low (redundant monitoring)
Source: SMA SUNNY CENTRAL 500CP XT / 630CP XT Solar Inverter
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