E031 error message

An E031 fault code on an Aurora Power One / ABB inverter is an internal relay fault. We have come across this fault numerous times and unfortunately it is always an irreparable error that results in needing a replacement inverter unit. ABB Aurora inverters almost always came with a 5 year product warranty.

If you would like Naked Solar to quote for a replacement inverter, please fill out our Maintenance Enquiry form, and advise us of the exact panels that you have in your current system so that we can check for a compatible inverter replacement.  

Meter Error

A Meter Error can occur on a Solax inverter even if a SolaX meter is not installed. It is an error that can sometimes be cleared: although not guaranteeing operation afterwards, it is worth attempting to correct this.

In the menu, to go up a page, single press the “up arrow” button. To go down a screen, single press the “down arow” button.

To go Back in the menu, long press the “up arrow” button. To press enter/ok, long press the “down arrow” button.

1. From the start screen, press Enter to access the next level of screens.
2. Press the down arrow until you see “Setting”, press Enter
3. It will ask for a password at this stage. The password will be one of the following:

0000, 2012, 2013, 2014, 2015, 2016 – try these combinations – one of them is correct! Then press Enter.

1. In the next section of menus (which should start with “safety grid” according to the manual), use the down arrow button until your get to “Reset Meter”, press Enter
2. Select “Yes”, press Enter
3. It may ask you to confirm this action. You do want to do this.
4. That should Reset the internal meter setting part of the inverter. Come all of the way back out of the menus, using the “Back” function.
5. The inverter may after a moment start operation again. If it does not, please perform a power cycle on the unit, but turning the inverter isolators off for a full 2 minutes, and then back on again.
6. That should do it!

If you get stuck along the way, or your menu layout differs to the above, please contact us.

Solis OV-BUS

A Solis OV-BUS alarm is an internal error meaning overvoltage on the DC busbar. It is not able to be repaired. If you have this fault displaying then please be aware that a replacement inverter will be required. Solis inverters are usually provided with a 5 year product warranty. If you would like Naked Solar to quote for a replacement inverter, please fill out the form, and advise us of the exact panels that you have in your current system so that we can check for a compatible inverter replacement. 

Solis NO GRID

Your Solis inverter is not receiving any AC power. Ensure your red/yellow solar AC isolator switch is in the correct “on” position. Check your consumer unit (fuse board) – has the PV/solar fuse tripped off? 

Solis OV-G-V / UN-G-V

This error message says that the voltage the inverter is reading from the grid is either too high (OV-G-V) or too low (UN-G-V) for it to operate. The UK’s grid voltage is 230V as standard but does fluctuate. Most household appliances, including solar inverters, have a tolerance to the fluctuation in the grid voltage. Solar inverters are typically more sensitive to this than other appliances. Most inverters have a tolerance of +/- 10-15%, meaning that they will stay switched on and producing when the grid is in this range. 

If, however, the grid voltage moves out of this operating range, the inverter will switch off in order to protect itself. This can be caused by things such as grid maintenance, lightning, power surges, and others. If this is the case, your inverter should turn itself off. We would recommend switching all DC and AC isolators off as well if you see these codes. After any known maintenance has been done, you should be able to switch your system back on, with the inverter working again as usual. 

If these errors messages are frequent, then there could be a more constant grid voltage issue in your area. If this is the case, we recommend the following: 

1. If you have neighbors with solar, ask if they have experienced similar things recently. If they don’t have solar, have they had any issues with fuses tripping of late? 
2. Contact your DNO. In the South West, this is often National Grid. Explain to them that the grid voltage is causing appliances to switch off and display a grid voltage error message. 
3. Await the DNO’s verdict.

It can be a tricky problem to alleviate due to the fact that grid voltage does fluctuate constantly. Therefore, if your DNO visit at a time when it is within normal range, they will say that it is normal. 

Solis OV-G-F / UN-G-F 

Similar to the above but relating to Grid Frequency. 

This error message says that the frequency the inverter is reading from the grid is either too high (OV-G-F) or too low (UN-G-F) for it to operate. The UK’s grid voltage is 50Hz as standard but does fluctuate. Most household appliances, including solar inverters have a tolerance to the fluctuation in the grid voltage. Solar inverters are typically more sensitive to this than other appliances. 

If the grid frequency moves out of the normal operating range, your inverter will switch off in order to protect itself. This can be caused by things such as grid maintenance, lightning, power surges, and others. If this is the case, your inverter should power off itself. We would recommend switching all DC and AC isolators off as well if you see these codes. After any known maintenance has been done, you should be able to switch your system back on, with the inverter working again as usual. 

If these errors messages are frequent, then there could be a more constant grid frequency issue in your area. If this is the case, we recommend the following: 

1. If you have neighbors with solar, ask if they have experienced similar things recently. If they don’t have solar, have they had any issues with fuses tripping of late? 
2. Contact your DNO. In the South West, this is often National Grid. Explain to them that the grid frequency is causing appliances to switch off and display a grid frequency error message. 
3. Await the DNOs verdict.

As with voltage, it can be a tricky problem to alleviate due to the fact that grid frequency does fluctuate constantly. Therefore, if your DNO visit at a time when it is within normal range, they will say that it is normal. 

Solis I-LEAK-PRO 

The I-LEAK-PRO fault code is a DC Isolation error code. RISO (DC Isolation) faults are complex faults that can be caused by a variety of things. Most commonly they are caused by a slight ingress of moisture somewhere on the DC line between panels and the inverter. To read more on Isolation faults see the section Other Faults on our Maintenance Homepage.