Learn about Fronius Error Code 104, its meaning, causes, and how to reset it effectively.
State Code 104 typically indicates a grid connection issue with the inverter. It may require checking the utility grid status or inverter settings.
To reset your Fronius inverter, turn off the inverter and disconnect it from the grid. Wait for a few minutes before reconnecting and powering it back on.
Fronius Error 104 is primarily associated with insulation resistance issues, specifically indicating that the inverter has detected a potential ground fault. The inverter continuously monitors insulation resistance (RISO) to ensure that no unintended current paths exist that could lead to safety hazards. If the measured insulation resistance falls below a critical threshold, the inverter triggers this fault code to prevent damage and ensure user safety. This can occur due to moisture ingress, damaged wiring, or degraded insulation in the PV array or associated wiring.
When a Fronius inverter displays State 104, users may notice a red LED indicator on the inverter, signaling a fault condition. Additionally, monitoring apps may alert users to a drop in energy production or indicate that the inverter is not operational. This can lead to concerns about system efficiency and energy generation.
Always consult a licensed electrician or certified solar installer when troubleshooting electrical issues to ensure safety and compliance with local codes.
To avoid encountering Error 104 in the future, regularly inspect the solar array and wiring for signs of wear or damage. Ensure that all connections are secure and that the system meets NEC regulations. Schedule routine maintenance checks to verify insulation resistance and overall system performance.