463
Reversed AC polarity, AC connector inserted incorrectly
Fronius · Symo Advanced Manual
What does 463 mean?
The AC power cable has been connected with reversed polarity, or the AC connector is inserted incorrectly. This is a wiring error that can prevent the inverter from operating safely and correctly.
Common Causes
- Incorrect wiring of live and neutral or phase conductors at the AC connection point
- Improper insertion of the AC connector
Repair Steps & Checklist
Click steps to track your progress.
- 1
If this status code is displayed all the time, notify a Fronius-trained service engineer to inspect AC wiring.
Verified technical data. Last updated: March 2026
Related Faults
Source: Fronius Symo Advanced Manual