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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.

XFMR_TEMP_F

High Transformer Temperature (Forced Shutdown)

SMA · SUNNY BOY 5000US-8000US Solar Inverter

What does XFMR_TEMP_F mean?

The internal transformer of the Sunny Boy SB50US-80US-IUS094030 has reached an excessively high temperature, causing the inverter to cease operation. The cooling fans will automatically activate and run at maximum speed to reduce the temperature.

Common Causes

  • Excessive temperature of the internal transformer.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the function and airflow of the inverter's cooling fans.

Browse all codes in this manual (23)
Verified technical data. Last updated: April 2026

Related Faults

Bfr-SrrMicro-controller Communication FailureDeratingInverter Output Power Reduction Due to High TemperatureEEPROMEEPROM Non-Essential Data Access Failure
Source: SMA SUNNY BOY 5000US-8000US Solar Inverter
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