Info What does this mean?
A status message, not a fault. It usually clears on its own and needs no action from you.
Fronius Inverter STATE 102 Error: Meaning, Causes & Safe Fix
STATE 102 means the AC grid voltage is too high. The inverter has disconnected for safety and will resume automatically once voltage is back in range.
What should I do first?
Two quick questions — we'll point you to the right starting point.
Is this code still showing on your inverter's display?
Is your system producing power right now?
What this code means
STATE 102 is a Class 1 grid status code: AC voltage at the inverter exceeded the permitted limit (it must stay within +10%/−12% of nominal), so the inverter disconnected from the grid. It tests grid conditions continuously and resumes feeding power automatically after a stable observation period. The cause is typically the grid, not a device fault.Common causes
- High grid voltage in your area — common at midday when many solar systems export
- Your own system raising local voltage (voltage rise)
- A network transformer tap set high
- A loose neutral connection (needs a professional check)
Safe steps to try
Work top to bottom, ticking off each step as you complete it. 0 of 5 done.
Is your inverter still under warranty?
Before paying for a repair, check — your installer may fix this free.
Based on typical standard warranty terms — always confirm with your warranty card or installer paperwork, as terms vary by model, region, and purchase date.
When to call an electrician
If STATE 102 keeps recurring, contact your system installer — persistent overvoltage may need a network assessment or a professional review of inverter settings.
Frequently asked questions
Why does STATE 102 happen on sunny days?
When lots of rooftop solar exports at once, local grid voltage rises. Your inverter disconnects to stay within legal limits, then reconnects.
Will this damage my inverter?
No — disconnecting is the protection working exactly as designed.
Can anything be done about frequent 102 codes?
Yes, but only by professionals: your installer can review volt-watt settings and your network operator can assess local voltage. Never change grid settings yourself.
Sources: meaning and troubleshooting verified against the manufacturer's documentation — Fronius Operating Instructions (Symo/Primo) — 'Status codes and remedy' / 'STATE CODES' tables (Fronius docs 42,0410,0192 & 42,0410,1909 series)