Fronius Inverter Error Codes – The Complete Aussie Guide (2025)
Why your Fronius throws STATE codes
Fronius inverters are built to protect both you and the grid. Each “STATE” number is the inverter’s way of telling you exactly why it paused export. Most resets are automatic, complying with AS 4777.2:2020, but a handful require a licenced electrician or Fronius Service Partner.
How to read the code
- SnapINverter / GEN24 screen – press Enter and the first line shows STATE ###
- Solar.web app – open Events → Details
- LED-only units – number of red flashes = the code (see manual)
Press Enter twice to acknowledge the message after you’ve fixed the cause.
The complete Fronius error-code cheat-sheet
Below are all publicly documented codes for IG, IG Plus, Galvo, Primo, Symo, Symo Advanced, Eco and GEN24 models, consolidated for Australian grid conditions.
1 xx – Grid-side limits breached
| Code | Models¹ | Meaning on AU grid |
|---|---|---|
| 101 | IG / IG Plus | Grid voltage beyond limits |
| 102 | Galvo / Primo / Symo | AC voltage too high |
| 103 | Galvo / Primo / Symo | AC voltage too low |
| 105 | Galvo / Primo / Symo | AC frequency too high |
| 106 | Galvo / Primo / Symo | AC frequency too low |
| 107 | All | Grid parameters outside limits – waiting to resynchronise |
| 108 | All | Islanding detected (anti-islanding trip) |
| 112 | Primo / Symo | RCMU test error (residual-current monitor) |
2 xx – ENS / grid-monitoring hardware
| Code range | Models | Explanation |
|---|---|---|
| 201 – 210 | IG series | Internal ENS signalling faults, voltage imbalance, etc. |
3 xx – Operating-state interruptions
| Code | Models | Explanation |
|---|---|---|
| 301 | All | AC over-current spike |
| 302 | All | DC over-current spike |
| 303 | All | Heat-sink over-temperature |
| 304 | All | Internal temperature too high |
| 306 | All | Low PV power (dawn/dusk) |
| 307 | All | PV voltage too low |
| 308 | All | DC-link over-voltage |
| 309 / 313 | Primo | DC input voltage too high on MPPT 1 / 2 |
4 xx – Hardware / firmware faults (call a sparkie)
| Code | Models | What it means |
|---|---|---|
| 401 | All | No comms with power stage |
| 406 / 407 | All | Temperature-sensor failure |
| 408 | Primo / Galvo | DC feed-in detected on AC side |
| 412 | Galvo / Primo | Fixed-voltage mode set wrongly |
| 431 | Primo | Firmware corruption |
| 437 – 438 | Primo | Power-stage incompatibility |
| 443 | IG / Primo | DC-link voltage too low |
| 447 | Primo | Insulation (earth-fault) |
| 457 | Primo / Galvo | Grid relay sticking |
| 474 / 475 | Primo / Galvo | RCMU or panel ground-fault sensor failure |
5 xx – Warnings & data-logging quirks
| Code | Models | Summary |
|---|---|---|
| 501 | IG | Heat-sink hot while derated |
| 502 | Galvo / Primo | Array insulation error |
| 509 | Galvo / Primo / Symo | No energy fed for 24 h |
| 515 / 516 | Primo / Symo | No comms with filter / storage add-on |
| 517 | Primo / Symo | Temperature derating active |
| 522 / 523 | Primo / Symo | DC-input voltage too low on string 1 / 2 |
| 558 – 560 | All SnapINverters | Board mismatch / Volt-Watt derating |
| 566 | Primo / Symo | Arc detector disabled |
| 567 | All SnapINverters | Grid-Voltage Dependent Power Reduction active – common on QLD grids above 250 V |
6 xx – CAN-bus & sensor layer
| Code | Models | Meaning |
|---|---|---|
| 601 | Symo | CAN bus full – update firmware |
| 603 / 604 | Symo | Module temperature sensor faulty |
| 607 | Symo / Eco | RCMU error – insulation check |
| 668 | Galvo | Incorrect external-signal input |
7 xx – Control-system & USB / RTC
| Code | Models | Meaning |
|---|---|---|
| 705 | All | Inverter number conflict on Solar.Net |
| 721 | All | EEPROM initialised / faulty |
| 731 – 735 | All | USB stick not recognised / update file wrong |
| 745 | All | Update file corrupt |
| 751 / 752 / 757 | All | Real-time clock lost time / hardware error |
| 766 | Galvo | Emergency-power derating |
¹Models key:
IG = IG/IG Plus/TL • Galvo = Galvo 1.5–3.1 kW • Primo = SnapINverter 3–8.2 kW • Symo = SnapINverter 3 ph 3–20 kW • Eco = SnapINverter 25/27 kW • GEN24 = Primo/Symo GEN24 Plus
DIY checks before you call
- Full reboot – AC isolator → DC isolator OFF, wait 5 min, then DC → AC ON.
- Switchboard voltage – over 255 V at the main breaker can trigger STATE 567; ask Energex to drop the tap or have a sparky lower the inverter’s Volt-Watt point to 250 V.
- Array insulation – if rain just hit and you see STATE 502/447, a wet junction box or dodgy MC4 is likely. Dry weather may clear it.
- Airflow – clear spider webs and garden gear 300 mm around the inverter heatsink.
Safety first: anything inside the inverter cover, or involving DC connectors, is licenced-sparky territory under Queensland law.
When to ring Universe Solar (Gold Coast)
- Persistent 4 xx codes after a reboot.
- Repeated STATE 567 even when grid voltage at the switchboard is < 252 V.
- Arc-faults (566), RCMU errors (607/475) or earth-faults (447/502).
- Battery or backup faults on GEN24 units.
📞 Free Consultation: 1300 363 178 • universesolar.com.au
Preventative tips for longer inverter life
- Annual clean & tighten: Dust the heatsink, check torque on AC isolator screws.
- Firmware updates: Download from Solar.web > Inverter – Update to a USB; takes 10 min.
- Shade & shelter: QLD sun accelerates capacitor ageing. If your inverter bakes in the arvo sun, add a simple shade hood.
- Surge protection: Gold Coast storm season loves a good spike – fit DIN-rail surge arresters at the switchboard.
FAQ
Q: What does STATE 567 mean?
A: The inverter is limiting power because grid voltage at its terminals exceeded its preset threshold (typically 253 V). Check switchboard voltage; an electrician can set the Volt-Watt curve to start at 250 V if your DNSP allows.
Q: Will a fault kill my feed-in tariff?
A: Only while the fault is active. Fix it and you’re back to banking kWh.
Q: My inverter shows 522 at dawn – is that bad?
A: No. It’s just telling you PV voltage is below the MPPT window before sunrise. It clears once panels reach ~150 V.
Need a hand?
Universe Solar services Fronius inverters from Tweed to Brisbane. Book online or call 1300 363 178 and get your solar savings flowing again today.
