Fronius Error Code 112 – Meaning, Causes & Solution -... | solarfaults.org

Technical Background:

The Fronius inverter triggers fault 112 due to an insulation resistance (Riso) measurement falling below acceptable levels. This measurement is crucial for ensuring that the solar array is not inadvertently connected to ground, which could pose safety risks such as electric shock or fire. The inverter continuously monitors for ground faults as part of its safety protocol, and when it detects an anomaly, it enters a protective state to prevent damage or hazards. The inverter's internal circuitry assesses the insulation resistance of the solar array and if it detects values that indicate a potential fault, it will initiate the 112 error code.

Symptoms:

Homeowners may notice the inverter displaying fault 112 on the LED screen, accompanied by a red LED indicator. Monitoring apps may show a sudden drop in energy production or indicate an isolation fault. In some cases, the inverter may stop operating entirely, leading to a complete halt in energy generation.

Possible Causes:

Insulation failure in the solar array or wiring, leading to a low insulation resistance value.
Moisture ingress in junction boxes or connectors, causing unintended ground faults.
Damaged or improperly installed cables that compromise insulation integrity.
Grounding issues, such as a loose ground connection or corroded grounding electrode.
Faulty inverter hardware, including internal components related to ground fault detection circuitry.
External environmental factors, such as debris accumulation or physical damage to the solar modules.

Solution:

1

Disconnect the inverter from the utility grid using the AC and DC disconnect switches to ensure safety.
2

Use a multimeter to measure the insulation resistance (Riso) of the solar array to ground. A reading below 1 MΩ indicates a fault.
3

Inspect all wiring, connectors, and junction boxes for signs of moisture, damage, or corrosion. Replace any compromised components.
4

Verify that all ground connections are secure and free of corrosion. Tighten or replace connections as necessary.
5

Conduct a visual inspection of the solar modules for any physical damage or debris that may affect performance.
6

Reconnect the inverter and monitor for fault 112. If the fault persists, consider contacting the manufacturer or a certified technician for further diagnosis.
7

Document all findings and repairs for future reference.

Safety Warning:

Always consult with a licensed electrician or certified solar installer when performing maintenance or troubleshooting on solar inverter systems to ensure compliance with safety standards and regulations.

Prevention:

To avoid future occurrences of fault 112, ensure regular maintenance of the solar array, including inspections for moisture ingress, cable integrity, and the condition of junction boxes. Implement protective measures such as proper sealing of junction boxes and using high-quality connectors. Regularly check grounding connections and ensure they are free of corrosion. Additionally, consider installing protective devices such as surge protectors to mitigate the impact of environmental factors.

Frequently Asked Questions

•What does Fronius Error Code 112 indicate?

Fronius Error Code 112 indicates an isolation fault, which can affect system performance. It is crucial to address this issue to ensure safe operation.

•How can I troubleshoot an isolation fault?

To troubleshoot an isolation fault, check the wiring and connections for any damage. Additionally, use a multimeter to test the insulation resistance.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Frequently Asked Questions

•What does Fronius Error Code 112 indicate?

•How can I troubleshoot an isolation fault?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention: