Sungrow Inverter Fault Codes – The Complete Aussie Guide (2025)
Why Sungrow shows Fault and Alarm codes
Sungrow splits errors into two buckets:
| Class | What triggers it | Does the inverter shut down? |
|---|---|---|
| Fault | Safety trip: grid voltage/frequency, isolation, hardware | Yes – reconnects automatically when safe |
| Alarm | Non-critical warning (fan, comms, clock) | Usually keeps running |
All trips comply with AS 4777.2:2020, protecting both the grid and your gear.
How to find the code
- SG / CX / RS series – press the grey touch button until the LCD reads
Fault XXX. - SH hybrids – open iSolarCloud → Device Alarms.
- LED-only RS-S – count red LED flashes (refer to user manual).
- Portal alerts – iSolarCloud emails the “Fault XXX” string.
Hit the button once to acknowledge a latched alarm after you’ve fixed the root cause.
Sungrow Fault-Code Cheat-Sheet
(Tip for WordPress: wrap each table in a <details> tag for click-to-expand accordions).
System / Grid-Side Faults – voltage, frequency & islanding
| Code | Message | Aussie meaning |
|---|---|---|
| 002 | Grid over-voltage | Instant VL-N > 275 V on Energex lines |
| 003 | Transient over-voltage | Spike > 440 V (lightning, loose neutral) |
| 004 | Grid under-voltage (stage I) | V < 200 V for > 100 ms |
| 005 | Grid under-voltage (stage II) | V < 180 V (brown-out) |
| 006 | AC over-current | Surge on feeder – often clears itself |
| 008 | Grid over-frequency | f > 51 Hz |
| 009 | Grid under-frequency | f < 49 Hz |
| 010 | Grid failure (islanding) | Inverter sees zero volts – mains down |
| 011 | DC-current injection high | Possible damaged IGBTs |
| 012 | Leakage current high | Wet junction box or pinched PV lead |
| 014 | 10-min grid over-voltage | Average > 255 V (AS 4777 sustained) |
| 015 | High grid over-voltage | V > 260 V (stage II) |
| 100 | AC output current high | Hard export into weak grid |
| 101 | Grid over-frequency (stage II) | f > 52 Hz |
| 102 | Grid under-frequency (stage II) | f < 48 Hz |
| 106 | Inverter not grounded | PE loose / missing |
PV & DC-Side Faults
| Code | Message | What it means |
|---|---|---|
| 021 | PV1 input over-current | Mis-matched string or short |
| 022 | PV2 input over-current | As above on MPPT 2 |
| 028 | PV1 reverse connection | Polarity swapped |
| 029 | PV2 reverse connection | — |
| 039 | PV insulation low | < 1 MΩ – moisture on roof / conduit |
| 041 | Leakage-current sensor fault | CT board issue |
| 045 | PV1 boost-circuit fault | Board component |
| 046 | PV2 boost-circuit fault | — |
| 047 | PV inputs order error | Strings crossed – reseat MC4s |
| 050 | Device abnormal (generic) | Reboot; log a service call if repeats |
Hardware, Fan & Temperature Faults
| Code | Message | Likely fix |
|---|---|---|
| 044 | Inverter self-test failed | Firmware reload or main board |
| 070 | Fan 1 fault | Replace fan (SG/RS) |
| 082 | External fan fault (CX) | Clean fins, test 24 V supply |
| 083 | Internal fan fault | As above |
| 512 / 513 | Fan comms error | Check harness, replace PCB |
| 619 | Heat-sink over-temp | Add shade hood, clear vents |
Comms & Hybrid-Specific Alarms
| Code | Message | Action |
|---|---|---|
| 514 | Meter comms abnormal | RS-485 loose – reseat wires |
| 517 | BMS disconnected | Power-cycle battery & inverter |
| 522 | Wifi module lost | Re-pair in iSolarCloud |
| 550 | RTC lost time | Sync clock in app |
DIY checks before you call
- Full reboot – AC isolator → DC isolator OFF, wait five minutes, then DC → AC ON.
- Switchboard voltage – anything above 252 V will keep 002/014 alive; Energex can drop the tap or we can tweak Volt-Watt to 250 V.
- Moisture & insulation – if code 039 or 012 appears after rain, open rooftop isolators and look for water ingress.
- Airflow & shade – clear 300 mm around fins; a $30 Colorbond shade hood drops internal temps by ~15 °C.
Safety first: under Queensland law, anything inside the inverter cover or involving DC connectors is licenced-sparky only.
When to ring Universe Solar (Gold Coast)
- Persistent 002 / 014 / 015 with switchboard < 252 V.
- Grounding or insulation faults (039, 106, 012) that don’t clear when dry.
- Fan / board faults (070, 082, 512) – fans are cheap, boards aren’t.
- Meter comms fault 514 on hybrids – export control won’t work.
📞 Free Consultation: 1300 363 178 • universesolar.com.au
Preventative care
- Annual fan clean: pop the grille (RS/SH) and brush dust.
- Firmware updates: iSolarCloud → Device → OTA Upgrade – 10 min on NBN.
- Shade the box: arvo sun kills electrolytic caps.
- Surge protection: DIN-rail arresters before storm season.
FAQ
Q: Will a 10-min over-voltage (014) kill my feed-in tariff?
A: Yes—export is zero until grid voltage averages < 255 V for 10 min, then the inverter reconnects.
Q: Can I widen the voltage limits myself?
A: No—AS 4777 settings are password-locked; only a CEC-accredited installer can adjust them.
Q: My hybrid shows Fault 514 but still makes power—bad?
A: You’re generating, but the meter data is missing, so the inverter can’t limit export or run backup; fix the RS-485 lead ASAP.
Need a hand?
Universe Solar services Sungrow inverters from Tweed to Brisbane. Book online or call 1300 363 178 and get your solar savings flowing again today.
