305
No power being fed in, despite closed relay
Fronius · Symo Advanced Manual
What does 305 mean?
The inverter's internal grid relay is closed, indicating an attempt to feed power, but no energy is being supplied to the grid. This leads to a short-term interruption, followed by the inverter resuming its start-up routine.
Common Causes
- Internal fault within the inverter's power stage preventing power generation
- Measurement error in the power output detection circuitry
Repair Steps & Checklist
Click steps to track your progress.
- 1
If this status code keeps recurring, contact your system engineer for diagnosis.
Verified technical data. Last updated: March 2026
Related Faults
Source: Fronius Symo Advanced Manual