On this page is a list of SolaX Solar Inverter fault messages and the manufacturers recommendations on how to troubleshoot the fault or error.
This section will help you narrow down the source of any problems you may encounter. Please read the following troubleshooting steps.
- Check the warning or fault messages on the System Control Panel or Fault codes on the inverter information panel. If a message is displayed, record it before doing anything further.
- Attempt the solution indicated in the table below.
Please Note: All electrical work must be performed by a licensed electrician.
| Faults | Diagnosis and Solution |
| SPI Fault | SPI communication fault • Disconnect PV+ , PV- and battery, reconnect them. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| SCI Fault | SCI communication fault • Disconnect PV+ , PV- and battery, reconnect them. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| CAN1 Fault | CAN communication fault • Disconnect PV+ , PV- and battery, reconnect them. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| PV Config Fault | PV Connection Setting Fault • Resetting the PV connection • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| Inv EEPROM Fault | Inverter EEPROM fault • Disconnect PV+ , PV- and battery, reconnect them. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| Relay Fault | Relay Fault • Disconnect PV+ , PV- and battery, reconnect them. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| Sample Fault | The detection circuit Fault • Disconnect PV+ , PV- and battery, reconnect them. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| RCD Fault | Residual Current Device Fault • Check the impedance of DC input and AC output. • Disconnect PV+ , PV- and battery, reconnect them. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| Fan1 Fault | Fan Device Fault • Disconnect PV+ , PV- and battery, reconnect them. • Check if the fan is stopped by dust or other foreign. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| Fan2 Fault | |
| AC HCT Fault | AC Current Sensor Fault • Disconnect PV+ , PV- and battery, reconnect them. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| OverLoad Fault | Over Load in EPS Mode. • Turn off high power device , press “ESC” to restart the inverter. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| EPS OCP Fault | Over Current in EPS Mode. • Make sure the load power is within the EPS power range. • Check if any nonlinear load is connect on the EPS. Remove this load to check if can recover. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| DCI Device Fault | DCI Device Fault • Disconnect PV+ , PV- and battery, reconnect them. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| EPS Relay Fault | EPS Relay Fault • Disconnect PV+ , PV- , grid and battery, reconnect them. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| TZ Protect Fault | Over current Fault. • Wait for a while to check if go back to normal status. • Disconnect PV+ , PV- and battery, reconnect them. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| Grid Lost Fault | Grid is Lost. • System will reconnect if the utility is back to normal. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| Grid Volt Fault | Grid Voltage Out of Range • System will reconnect if the utility is back to normal. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| Grid Freq Fault | Grid Voltage out of range • System will reconnect if the utility is back to normal. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| PLL Lost Fault | The Grid is Not Good. • System will reconnect if the utility is back to normal. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| Bus Volt Fault | Bus Voltage out of Normal Range. • Disconnect PV+ , PV- and battery, reconnect them. • Check if the PV input is within the range of the inverter. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| AC5M Volt Fault | The grid’s voltage is out of range for the last 5 Minutes. • The system will back to normal if the grid is back • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| Inv OCP Fault | Inverter over current protection fault • Wait for a while to check if back to normal. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| PV Volt Fault | PV Voltage Fault • Check the output of the PV voltage. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| AC10M Volt Fault | The grid’s Voltage is out of range for the last 10 minutes. • The system will back to normal if the grid is back • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| Isolation Fault | Isolation Fault • Check the connection of the inverter. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| Temp Over Fault | Temperature over the limitation • Check if the fan is running normally. • Check if the environment temperature is over limitation. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| Fan1 Speed Fault | Fan speed out of the normal range. • Check if the fan is stopped by dust or other foreign. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| Fan2 Speed Fault | |
| C1 Can Fault | The battery group’s can communication fault. • Reconnect the charger communication cable. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| C1 Temp High | The battery charger is over temperature. • Check if the air ducting of the charger is blocked. • Improve the working environment or reduce the charging or discharging current. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| C1 FAN Fault | The fan of the charger is broken. • Check if the fan is working normally. • Check if anything blocking the fan • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| C1 TZ Fault | The protection of the charger fault. • Wait for a while to check if back to normal. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| C1 EEPROM Fault | The charger’s EEPROM fault. • Wait for a while to check if back to normal. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| C1 HCT1 Fault | The charger’s current detection fault. • Reconnect the charger. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| C1 HCT2 Fault | |
| C1 Bus OVP | The Bus voltage of the charger over limit. • Wait for a while to check if back to normal. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| C1 Temp Low | The charger is under temperature • Improve the working environment of the charger. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| C1 Boost OVP | The Boost voltage of the charger over limit. •Wait for a while to check if back to normal. •If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| C1 Bat OVP | The battery voltage is over limit. •Wait for a while to check if back to normal. •If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| C1 Charger OCP | The charger is over current protected. •Wait for a while to check if back to normal. •If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| C1 Boost OCP | The boost current of the charger is over limit. •Wait for a while to check if back to normal. •If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| CT Fault | The CT or the meter is not connected well. •Check the connection of the CT or the meter. •If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| RC Fault | DCI over current protection Fault. •Wait for a while to check if back to normal. •If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| DCI OCP Fault | DCI over current protection Fault. •Wait for a while to check if back to normal. •If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| Other device Fault | Other device fault. •Turn off the PV, battery and grid, reconnect them. •If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| SW OCP Fault | Over current fault detected by software. •Turn off the PV, battery and grid, reconnect them. •If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| DM9000 Fault | Network DSP fault. •Turn off the PV, battery and grid, reconnect them. •If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| RTC Fault | RTC Fault •Turn off the PV, battery and grid, reconnect them. •If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| Mgr EEPROM Fault | Manager EEPROM Fault. •Turn off the PV, battery and grid, reconnect them. •If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| Mgr CAN Fault | Manager CAN Fault • Turn off the PV, battery and grid , reconnect them. • If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| C1 SPI Fault | Charge can communication fault. •Turn off the PV, battery and grid, reconnect them. •If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| Fault | Charge over current detected by hardware C1 TZ •Turn off the PV, battery and grid, reconnect them. •If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| C1 FAN Fault | Charge FAN Fault. •Check if the fan is blocked. •If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
| C1 sample Fault | Charge sample fault. •Turn off the PV, battery and grid, reconnect them. •If the inverter doesn’t go back to its normal state contact your local solar power expert for further assistance. |
If you need the more information on any of the above, you can find it in the SolaX solar inverter manual’s Troubleshooting section. Should you follow the troubleshooting steps above but the issue is not fixed on your SolaX solar inverter check if it’s still within the warranty period so you can contact the equipment installer or supplier.
If your SolaX Solar Inverter is outside the warranty period we suggest that you contact a professional solar power expert. If you’re in the Gold Coast or Brisbane area contact Gold Coast Power Solutions here and we will be in touch to provide you with further assistance.
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Good Day Friends, I recently installed a Solax X1 with a Triple M master battery with a BMS. A few weeks ago I encountered a meter fault which was removed through a system restart. After that there is a new error “DSP Communication Failed” and the Settings and advanced settings are now disabled and cannot check any configuration settings. The battery has since discharged and it shows as 0% on the display panel of the inverter.If I check status for the grid it does not register any current and shows 0%.
The installation expert has resorted to believe that it is factory fault on the inverter.
Any guidance would be appreciated.
Thank you.
Hi Francisco, maybe try a reboot of the Solax inverter, that may help.
Hello. After 6months of perfect functioning my inverter stopped sending the data to solax cloud. It looks like the inverter is offline, however a local connection is still possible and works fine. Nothing changed in the network so I really have no clue on how to fix it.
Any tips?
Thank you
Hi Peter, sorry to hear about your issue. It’s hard to tell what the cause of the problem is, as it could be the batteries or the inverter. The batteries should be able to be charged back up however they may require a specialised charger to do so. The standard inverter charger probably won’t talk to the batteries to charge them from a flat state as it needs to be communicating with the batteries via the BMS to put any charge across.
I have a solax hybrid inverter connected to 2 pylontech US 2000 2.4Kw lithium batteries……… after 2 years the batteries stopped charging. A local engineer said it the inverter displayed the following faults “C1 boost OCP” (charger over limit) and “BMS LOST”
(Inverter not communicating with the batteries)
.
Would this be an inverter fault or a battery fault? all the wiring was checked OK
.
The batteries are now flat, no charge in them. can they be charged up from flat, if the inverter was replaced?