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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

7801

Surge arrester is defective or back-up fuse tripped

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

What does 7801 mean?

The surge arrester is defective, or its back-up fuse has tripped. This compromises the inverter's protection against voltage surges. This is a warning that does not affect inverter behavior immediately but requires attention.

Common Causes

  • Damage to the surge arrester.
  • Tripped back-up fuse for the surge arrester.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the status and integrity of the surge arrester.

  2. 2

    Check the back-up fuse of the surge arrester for continuity and replace if tripped.

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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