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 307 Error: Meaning, Causes & Safe Fix
STATE 307 (LOW PV VOLTAGE) means the DC voltage from your panels is too low for the inverter to feed power — completely normal at dawn and dusk.
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 307 appears when the DC input voltage drops below the threshold needed for grid feed operation, so the inverter returns to its startup phase and waits. Fronius explicitly notes: due to low sunlight early in the morning and in the evening, STATE 307 (and 306) appear routinely every day — they do not indicate any kind of fault.Common causes
- Low sunlight at dawn and dusk — normal and daily
- Heavy cloud cover or shading
- Dirty panels reducing output
- A failing panel or string issue — only if it appears in strong sun
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
Contact your solar installer if STATE 307 appears during strong sunlight hours — that suggests a panel, string, or wiring problem rather than normal low light.
Frequently asked questions
Should I worry about STATE 307 every morning?
No — it is as routine as sunrise. The inverter waits for enough light, then starts normally.
307 shows at midday — what now?
That is not normal. Note it and call your installer — a string may be underperforming or disconnected.
What is the difference between 306 and 307?
306 is low PV power (output); 307 is low PV voltage (input). Both are routine in low light, and neither indicates a fault on its own.
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)