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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.

300

Temperature Sensor Connection Failure

Fronius · Perfect Charging

What does 300 mean?

The battery charger was unable to establish a connection with the temperature sensor. This prevents the charger from monitoring crucial temperature data, which is essential for safety and optimal charging performance.

Common Causes

  • A disconnected or damaged wiring between the charger and the temperature sensor.
  • A faulty temperature sensor that is not responding or providing a valid signal.
  • Incorrect wiring or improper termination of the sensor connection at the charger's input terminals.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the physical connection and wiring integrity of the temperature sensor, ensuring it is securely connected to the designated terminals.

  2. 2

    Measure the resistance of the temperature sensor across its terminals and compare it to the expected resistance values for its ambient temperature.

  3. 3

    Check the sensor's terminal connections on the charger for proper seating and absence of corrosion.

Browse all codes in this manual (61)
Verified technical data. Last updated: April 2026

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101Gateway CAN Connect Timeout102Gateway No Back-end Connection103Gateway Charger/Registration Mismatch
Source: Fronius Perfect Charging
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