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ErrorLib — Industrial Fault Code Library

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4

Fieldbus hardware fault

Fronius · Solar Energy

What does 4 mean?

This fault indicates a hardware problem with the fieldbus communication interface. This affects the device's ability to communicate over the fieldbus network, preventing data exchange with other connected systems or controllers.

Common Causes

  • Physical damage to fieldbus communication module
  • Failure of fieldbus transceiver components

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect all fieldbus cabling for physical damage, proper termination resistors, and secure connections at both the Fronius device and network controller ends.

  2. 2

    Verify proper supply voltage to the Fronius Solar Energy device according to manufacturer specifications, ensuring stable power to the communication interface.

  3. 3

    Check the integrity and seating of the fieldbus connector on the Fronius device for any signs of looseness or corrosion.

  4. 4

    Verify fieldbus communication parameters (e.g., baud rate, device address, bus termination settings) in the Fronius device configuration match the network master settings.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

1Hardware fault102AC voltage too high103AC voltage too low
Source: Fronius Solar Energy
Open Manual (Page 134)Search more codes in this manual