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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.

120

String 1 Reverse

Huawei · SUN2000 8-28KTL Solar Inverter

What does 120 mean?

A warning indicating that the cables for PV string 1 were connected in reverse during the SUN2000 installation. This incorrect polarity can prevent power generation from this string or cause damage to the inverter if not corrected.

Common Causes

  • The cables between PV string 1 were connected in reverse during SUN2000 installation.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check whether the cables for PV string 1 are correctly connected.

  2. 2

    If they are connected in reverse, reconnect the cables with correct polarity.

Browse all codes in this manual (26)
Verified technical data. Last updated: April 2026

Related Faults

103DC Over Voltage106String 1 Abnormal107String 2 Abnormal
Source: Huawei SUN2000 8-28KTL Solar Inverter
Open Manual (Page 120)Search more codes in this manual