Solis Inverter Repair and Fault Codes
OV-G-V on the screen, an inverter that cuts out on sunny afternoons, or no output at all? We diagnose and repair Solis inverters from any installer, across England, Wales and Scotland.
Repairs you can rely on
- MCS registered
- NAPIT registered
- TrustMark approved
- Fully insured
- Any installer’s system
- In-house engineers — no subcontractors
Call us on 0800 156 0191
Monday to Friday, 9:00am–5:00pm
Is this what you’re seeing?
An alarm message on the display, such as OV-G-V or NO-Grid
The inverter switches off on sunny afternoons, then comes back
A leakage current or earth fault alarm
Alarms that only appear in rain or early in the morning
The monitoring shows the inverter offline
A blank display, even in daylight
Zero output on a bright day
The solar breaker in the consumer unit keeps tripping
Note the message exactly as the display shows it, including any number on the end, such as OV-G-V01.
Call 0800 156 0191 or use the fault finder further down this page. If the solar breaker keeps tripping, leave the system switched off until an engineer has looked at it.
Common Solis faults
Solis inverters show faults as short alarm messages on the display, such as OV-G-V or NO-Grid, often with a number on the end. Solis’s first step for its alarms is the same: switch the inverter off, wait five minutes and restart it, as the manual describes. If the alarm comes back, the cause needs finding. We install solar and battery systems too, so we know how these faults show up in real homes.
Grid over-voltage
OV-G-V means the grid voltage at the inverter is above its upper limit, so it stops exporting. When the inverter is exporting at full power, voltage rises along the AC cable, and Solis notes that a cable that’s too small can push it over the limit. An occasional alarm clears itself. If it happens often, the grid voltage, the AC breaker and the cabling need checking. Solis says protection limits should only be changed with the network operator’s consent.
Grid under-voltage and no grid
UN-G-V means the grid voltage is below the inverter’s lower limit, and NO-Grid means the inverter can’t detect the grid at all. For NO-Grid, check that the AC isolator and the solar breaker in your consumer unit are on. If they are, the connection needs testing.
Grid interference
GRID-INTF alarms mean the inverter has detected a disturbed or unstable grid. On newer S6 inverters, GRID-INTF without a number is an AC overcurrent inside the inverter. A restart may clear it; if not, the AC connections and the inverter need checking.
Leakage current
ILeak-PRO means too much current is leaking to earth, so the inverter disconnects for safety. Solis notes that alarms that only appear in rain or early in the morning can come from ageing panels. Finding the cause means testing the strings one at a time, which is a job for an engineer.
Repair or replace?
We always diagnose first: many Solis alarms come from the grid connection, cabling or panels rather than the inverter. If the inverter has failed, you get a clear written quote before any work starts. Read more about inverter repair and replacement, or how we find faults across the whole system.
Solis error codes and what they mean
The meanings below come from Solis’s manuals for its 4G and 5G single-phase inverters and its S6 grid and hybrid inverters. The wording varies slightly between generations, and the number on the end tells an engineer which protection was triggered.
| Code | What it means | What to do |
|---|---|---|
| OV-G-V (OV-G-V01 to 05) | Grid voltage above the inverter’s upper limit | An occasional alarm clears itself. If it happens often, call us: the grid voltage and AC cabling need checking. |
| UN-G-V (UN-G-V01, 02) | Grid voltage below the inverter’s lower limit | Restart the inverter as its manual describes. If the alarm comes back, call us. |
| GRID-INTF (GRID-INTF01, 02) | Grid interference or an unstable grid; on S6 inverters, GRID-INTF (code 1030) is an AC overcurrent | Restart the inverter as its manual describes. If the alarm comes back, call us. |
| ILeak-PRO (ILeak-PRO01 to 04) | Leakage current protection: too much current leaking to earth | Call an engineer to test the strings and the earthing. |
| NO-Grid (NO-GRID on older models) | The inverter can’t detect any grid voltage | Check that the AC isolator and solar breaker are on. If they are, call us. |
When to call an engineer
Call us if you see any of these:
- OV-G-V alarms that happen often, especially on sunny afternoons
- Any ILeak-PRO alarm
- Any alarm that comes back after a restart
- Any message that isn’t in the table
Solis’s manuals say that if an alarm keeps coming back after a restart, the distributor or service centre should be contacted. Testing cables, strings and protection settings is work for a qualified engineer, so don’t open the inverter or disconnect its cables yourself.
Call 0800 156 0191 or use the fault finder below.
Why L&R Renewables
Any installer’s system
It doesn’t matter who fitted your Solis inverter or whether they’re still trading.
Certified, in-house engineers
We’re MCS and NAPIT registered and TrustMark approved, and our own engineers carry out every job.
Honest about repair versus replacement
If a repair will do the job, that’s what we recommend.
England, Wales & Scotland
We cover England, Wales and Scotland.
Frequently asked questions
What does OV-G-V mean on a Solis inverter?
OV-G-V means the grid voltage at the inverter has gone above its upper limit, so it has stopped exporting. An occasional alarm clears itself. If it happens often, especially on sunny afternoons, the grid voltage and the size of the AC cable need checking. Solis says protection limits should only be changed with the network operator’s consent.
Why does my Solis inverter show NO-Grid?
It means the inverter can’t detect any grid voltage. Check whether there’s a power cut, and that the AC isolator and the solar breaker in your consumer unit are switched on. If they are and the alarm stays, call us, because the connection or the inverter needs testing.
Can I reset a Solis alarm myself?
Solis’s first step for its alarms is to switch the inverter off, wait five minutes and restart it, following the manual. That can clear a one-off alarm. If the alarm comes back, there’s an underlying cause, and resetting it again won’t fix it.
My installer has gone bust. Can you still help?
Yes. We don’t need the original installer to be involved, and we provide the certification and documentation for any new inverter we fit.
Do you cover my area?
Our engineers cover England, Wales and Scotland. Call 0800 156 0191 or tell us your postcode in the fault finder and we’ll confirm cover for your area.
Related pages
Solar inverter repair
Repair and replacement for every major inverter brand.
Solar panel repair
Diagnosis and repair for the whole system, from any installer.
Solar panel servicing
An annual health check that catches faults early.
Tell us what your Solis inverter is doing
Answer four quick questions — including the error code — and leave your details, and we’ll call you back to arrange a visit. Prefer to talk? Call 0800 156 0191, Monday to Friday, 9:00am–5:00pm.
Solar fault finder
What’s happening with your system?
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Roughly how old is the system?
Where is the property?
Leave your details and we’ll be in touch to book your initial visit.
We’ll ring you to talk it through and arrange a convenient time. Your answers above go with your enquiry, so you won’t have to repeat them.
We’ll talk through what’s happening and book your initial visit. If it’s urgent, call 0800 156 0191.
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You can also reach us through our contact page.