Your Solis inverter has stopped feeding energy into the grid and is displaying an alarm on the LCD screen or in the SolisCloud app. Every alarm code corresponds to a specific condition the inverter has detected. Some clear themselves within minutes. Others need a qualified electrician.
Last reviewed: April 2026. Alarm code lists verified against current Solis/Ginlong service centre documentation, SolisCloud app alarm descriptions, and manufacturer user manuals. Contact PSW Life Support if your code is not listed or the recommended steps do not resolve the issue.
This guide applies to the full Solis residential and light commercial range installed in Australia:
- S5-GR1P and S6-GR1P (single-phase grid-tied)
- S5-EH1P and S6-EH1P (single-phase hybrid)
- S5-EH1P and S6-EH1P (single-phase hybrid)
- S6-EH3P (three-phase hybrid)
- and older 4G/5G generation models including the Solis-1P, Solis-3P, and RHI series
Solis (manufactured by Ginlong Technologies) uses short text abbreviations for alarm codes rather than plain numbers. Codes like OV-G-V, UN-G-F, and PV ISO-PRO appear on the LCD alongside hex reference numbers on newer models. This guide covers both the text abbreviations and hex references so you can find your alarm regardless of how your inverter displays it.
Contents
Finding your alarm code
- LCD-equipped inverters (most Solis models): Press ENTER on the keypad to access the main menu, then navigate to "Alarm Message" or "Error Info" using the UP/DOWN keys. The alarm text abbreviation and a brief description are displayed together.
- SolisCloud app (all WiFi-connected models): Open the SolisCloud app on your phone. Navigate to your plant, select the inverter, and check the "Alarm" section. Active and historical alarms are listed with timestamps.
- SolisCloud web portal: Log in at soliscloud.com. Navigate to your plant and check the alarm log under your inverter.
- LED indicators: If the green LED is off and the red LED is on or flashing, the inverter has faulted. Check the LCD screen or SolisCloud app for the specific alarm code.
Try a restart
Many Solis alarm codes resolve with a standard system restart. Before contacting your installer, try this:
- Switch OFF the AC isolator (the Solar Supply Main Switch in your switchboard, or the external AC isolator next to the inverter)
- Switch OFF the DC isolator (the rotary switch on the underside of the inverter)
- Wait at least two minutes. The inverter display should go completely blank
- Switch ON the DC isolator first
- Switch ON the AC isolator
- Wait for the inverter to complete its start-up checks. The LCD should show “Normal” or “Generating” within a few minutes
If the code reappears after the restart, note the exact alarm text and the time it occurred, then look it up below.
Safety notice: Never open the inverter cover or disconnect DC connectors yourself. DC cables from solar panels carry dangerous voltage during daylight hours. All work inside the inverter or on DC wiring is restricted to licensed electricians under Western Australian electrical safety legislation.
Grid and AC alarm codes
These codes indicate the grid supply at your property is outside the inverter’s permitted operating range. The inverter disconnects to comply with AS 4777.2 protection requirements and restarts automatically when conditions normalise.
In Perth, OV-G-V (over grid voltage) is the most common Solis alarm. Grid voltage on the SWIS network rises during high-solar-export periods, particularly in suburbs with high rooftop PV penetration. If you see this alarm around midday that clears by late afternoon, this is a network issue rather than an inverter problem.
| Alarm code | Hex ref | Description | What to do |
|---|---|---|---|
OV-G-V01/02/03/04 | 1010–1013 | Grid voltage too high (phases 1–4) | Most common alarm in Perth. The inverter restarts automatically when voltage drops. If persistent: check AC cable sizing (undersized cables increase voltage at the inverter terminals), verify the grid standard setting is correct for Australia, or request a Western Power network voltage assessment. Your installer can adjust voltage trip settings within the permitted range if approved |
UN-G-V01/02/03/04 | 1014–1017 | Grid voltage too low (phases 1–4) | Check for a grid outage or tripped breakers. If the grid is live and this persists, contact your installer to check AC connections and cable sizing |
OV-G-F01/02 | 1015 | Grid frequency too high | Automatic. Rare in WA. If persistent, contact your installer to verify protection settings |
UN-G-F01/02 | 1016 | Grid frequency too low | Automatic. Rare in WA. If persistent, contact your installer |
OV-G-I | 1018 | Grid output overcurrent. AC output current exceeds the inverter’s rated limit | Confirm the grid connection is normal and AC cables are properly connected. If the grid is normal, contact your installer |
IGFOL-F | 1019 | Grid current tracking error. The inverter cannot accurately follow the grid waveform | Restart. If persistent, confirm the grid is stable and AC cables are secure. Contact your installer if it continues |
PHASE-FAULT | 101A | Abnormal grid phase angle (three-phase models) | Check whether the AC wiring is correct and the grid phase angle is 120°. Restart the inverter. If unresolved, contact your installer |
No Grid / No-Grid | — | No grid voltage detected. The inverter cannot detect a mains supply | Check your switchboard for tripped breakers. Confirm there is no area outage on the Western Power outage map. Check that the AC connections and grid switch are on. If grid power is available and the alarm persists, contact your installer to check the AC terminal connections |
Reverse-GRID | — | Wrong AC polarity. The active and neutral connections are reversed | Contact your installer. This is a wiring fault that needs correction |
DC, insulation, and PV array alarm codes
These codes relate to the DC side of the system: solar panels, DC wiring, and the connection between the array and the inverter. Insulation faults are the most common DC-side issue and are often caused by moisture.
| Alarm code | Hex ref | Description | What to do |
|---|---|---|---|
PV ISO-PRO01/02 | 1033 | PV insulation resistance too low. The insulation between the PV array and earth has dropped below the minimum threshold | Check when the alarm occurs. If it appears in the early morning, late afternoon, or on rainy days, this can be normal (moisture on panel surfaces or in connectors temporarily reduces insulation resistance). If it occurs during dry midday conditions, contact your installer. Remove all DC inputs, reconnect one string at a time, and restart the inverter to identify which string is causing the fault |
Leak-CUR | — | Leakage current protection. Current is leaking to earth through the PV array or wiring | Check AC and DC connections. If persistent, contact your installer. This may indicate damaged cable insulation, a wet junction box, or a panel-level fault |
OV-DC01/02/03/04 | — | DC input overvoltage. The PV string voltage exceeds the inverter’s maximum input voltage | Contact your installer immediately. This should not occur in a correctly designed system. Possible causes: too many panels in series, a panel bypass diode fault, or extreme cold weather increasing open-circuit voltage |
Reverse-DC | — | Reverse DC polarity. The positive and negative DC connections are swapped | Contact your installer. This is an installation wiring fault |
Arcing protection | — | Arc fault detected in DC circuit (models with AFCI module) | ⚠️ Potential fire risk. Check all inverter DC connections for signs of arcing. Contact your installer immediately. Do not restart without professional inspection |
AFCI-Self | — | AFCI module self-detect fault. The arc fault detection hardware has failed its self-test | Restart the inverter. If persistent, the AFCI module may need replacement. Contact your installer |
Hardware and internal alarm codes
These codes indicate a fault within the inverter itself. Always try a full restart first. If the code returns, professional service is required.
| Alarm code | Hex ref | Description | What to do |
|---|---|---|---|
OV-TEM | 1032 | Internal temperature too high (near IGBTs). The inverter’s power electronics have exceeded the safe temperature limit (typically 90°C for single-phase, 115°C for three-phase) | Check ventilation around the inverter. Clear debris, spider webs, or vegetation. Verify the inverter is not in direct sunlight and is mounted at the correct angle per the user manual. In Perth, common on 40°C+ days. Turn off the inverter and wait 15 minutes before restarting. If persistent, contact your installer — a faulty temperature probe or loose probe connection can also trigger this |
Relay-chk | — | Relay check failure. The internal isolation relay has failed its self-test | Restart. If persistent, the relay may need replacement. Contact your installer |
BoostFal | 1020 | DC boost circuit fault | Restart. If persistent, contact your installer |
OV-BUS | 1021 | DC bus overvoltage. The internal DC bus voltage has exceeded the safe limit | Check whether the PV string configuration is correct (too many modules in series). Restart. If persistent, contact your installer |
DSP-B-FAULT | — | Communication failure between the main and slave DSP processors | Restart. If persistent, contact your installer. The inverter may need service or replacement |
12V-FAULT | — | Internal 12V power supply fault | Restart. If persistent, contact your installer |
INIT-FAULT | — | Initialisation system fault. The inverter cannot complete its start-up self-check | Restart. If persistent, contact your installer |
LCD show initialising all the time | — | The inverter cannot start up. Stuck in the initialisation loop | Check that the connectors on the main board and power board are firmly seated. Check the DSP connector to the power board. Contact your installer |
No power on LCD | — | The LCD screen is blank despite DC power being available | Check PV input connections. Check DC input voltage (single-phase needs above 120V, three-phase above 350V to start). Check whether PV+/- polarity is reversed. If connections are correct and voltage is present, contact your installer |
Battery and hybrid-specific alarm codes
S5-EH1P, S6-EH1P, S6-EH3P, RHI series
If you have a Solis hybrid inverter with a connected battery, you may see additional alarm codes related to the battery management system (BMS), backup output, and battery operation. These appear on the LCD and in the SolisCloud app.
| Alarm code | Description | What to do |
|---|---|---|
BMS Comm Fault | Battery management system communication failure. The inverter has lost communication with the battery | Check the communication cable (RJ45/CAT5) between the inverter and battery. Verify the cable is connected to the correct port (CAN H and CAN L). Try replacing the cable. If persistent, contact PSW Life Support |
Battery voltage too high | Contact your installer. The battery may have a cell imbalance or the battery type setting may be incorrect in the inverter configuration | |
Battery voltage too low | The battery may have been deeply discharged. Some lithium batteries require a minimum voltage before the inverter can communicate. Contact your installer or battery manufacturer | |
Battery Over-Temp | Battery temperature exceeds the safe operating range | Check ventilation around the battery. Ensure nothing is blocking airflow. Contact your installer if persistent |
Backup Overload | The load on the backup output exceeds the inverter’s backup capacity | Reduce the load by turning off high-draw appliances on the backup circuit. Check the inverter specifications for your model’s backup output rating |
Met slt fail | Meter communication failure. The inverter has lost communication with the energy meter | Check the RS485 communication cable between the inverter and meter. Verify cable connections and direction. Without meter communication, the inverter cannot manage export limiting or battery charging based on household consumption |
Solis LED status indicators
| LED | State | Meaning |
|---|---|---|
Green | Solid on | Normal operation. The inverter is generating power |
Green | Flashing | The inverter is in standby or start-up mode. Normal at dawn and dusk |
Red | Solid or flashing | A fault has occurred. Check the LCD screen or SolisCloud app for the alarm code |
All LEDs off | — | No power to the inverter. Check the AC isolator, DC isolator, and PV input connections |
Codes needing professional attention
Most Solis alarm codes are either temporary (grid-related) or can be resolved by restarting. The following codes require prompt action from a qualified electrician:
- PV ISO-PRO (persistent in dry conditions): Insulation breakdown in the DC wiring or panels. Safety-critical
- Leak-CUR: Earth leakage current detected
- Arcing protection: Potential fire risk in DC wiring. Do not restart without inspection
- OV-DC (persistent): DC voltage exceeds the inverter's maximum. Possible string design error
- Reverse-GRID / Reverse-DC: Polarity reversal. Installation wiring fault
PSW customers: For any code in this list, contact PSW Life Support. All other customers should call their original installer.
SolisCloud monitoring
If your SolisCloud app shows no data or your inverter appears offline, the inverter has usually just lost its WiFi connection. The solar system continues to generate power normally; you just cannot see the data.
Quick tips:
- Press the button on the WiFi data logging stick three times to reset the connection
- In the SolisCloud app, go to the device settings to reconfigure WiFi
- Solis WiFi sticks operate on 2.4GHz only. If your router combines 2.4GHz and 5GHz under one name and the connection fails, try temporarily splitting the bands
- The default password for local access is typically on the data logging stick label
Keep Solis firmware current
Solis releases firmware updates that improve grid compliance, fix bugs, and add features. Your installer can update firmware via the SolisCloud platform or through local connection during a site visit. Some updates can be pushed remotely by Solis if the inverter is online.
If your inverter is not connected to the internet, it cannot receive remote firmware updates. PSW recommends connecting your inverter to your home WiFi to enable monitoring, firmware updates, and fault notifications.
Frequent questions
My inverter shows OV-G-V every day around midday. Is it broken?
No. OV-G-V (over grid voltage) is the most common Solis alarm in Perth. Under AS 4777.2:2020, your inverter must disconnect when grid voltage exceeds the permitted threshold. This is common in suburbs with high rooftop solar penetration.
The inverter restarts automatically when the voltage drops. If this is significantly reducing your generation, your installer can check AC cable sizing, verify the grid standard setting, or request a Western Power network voltage assessment.
PV ISO-PRO appears after rain but clears when things dry out. Is this a problem?
Not immediately, but it needs attention. Moisture in MC4 connectors, panel junction boxes, or rooftop DC isolators temporarily reduces insulation resistance and triggers this alarm. While the system recovers when dry, the water ingress point should be found and sealed to prevent the issue worsening over time. Contact your installer to inspect the DC side.
What does "No Grid" mean?
The inverter cannot detect a mains supply. Check your switchboard breakers, confirm there is no area outage, and verify the AC connections and grid switch are on. If the grid is available and the alarm persists, contact your installer.
My hybrid inverter shows BMS Comm Fault. Is the battery damaged?
Not necessarily. This is usually a communication cable issue. Check the RJ45 cable between the inverter and battery. Try replacing it with a new CAT5 cable. If the alarm persists after a cable swap, the BMS or inverter communication port may need attention. Contact PSW Life Support.
I have an alarm code not listed here. What should I do?
Contact PSW Life Support with the alarm code text, your inverter model and serial number, and the approximate time the alarm appeared. We service Solis inverters across Perth and can diagnose many issues remotely through SolisCloud.
References
- Ginlong/Solis — Service Centre and alarm code documentation
Ginlong/Solis — SolisCloud monitoring portal
Ginlong Technologies — Product manuals and downloads
AS 4777.2:2020 — Grid connection of energy systems via inverters (Part 2: Inverter requirements)
Western Power — Technical Rules and Metering Code
This guide is current as of April 2026. Solis firmware updates may introduce new alarm codes or modify existing behaviour. PSW customers should contact PSW Life Support for the latest information.
