Insulation fault

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An insulation fault has been detected within the inverter or its connected circuits, meaning there is an unintended electrical path to ground. This is a critical safety issue, and the inverter will stop feeding energy into the grid.

• Degradation or damage to wiring insulation (AC or DC side)
• Moisture ingress into the inverter or connections
• Internal component failure leading to a ground fault

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   If this status code is displayed all the time, notify a Fronius-trained service engineer.