SolarEdge Inverter Repair and Fault Codes
Error code on the screen, optimisers missing from the app, or no production on a sunny day? We diagnose and repair SolarEdge inverters and power optimisers 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 error code on the inverter screen or in the SolarEdge monitoring platform
The monitoring says the inverter isn’t producing
Fewer power optimisers reporting than you have panels
An isolation fault that clears, then comes back on damp mornings
The inverter says the grid is down, or the grid voltage is out of range
The inverter has locked itself and won’t reconnect
Note the code and when it appeared: it often tells us where to look.
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 SolarEdge faults
SolarEdge systems have a power optimiser behind each panel, or each pair of panels, as well as the inverter, so a fault can sit in the inverter, an optimiser, the connectors between them or the link to the monitoring. We install solar and battery systems too, so we know how these faults show up.
Isolation faults
SolarEdge reports an isolation fault when the insulation between the panel wiring and earth drops too low, usually because of water in a connector, a damaged cable or a faulty optimiser. SolarEdge notes that it can clear and come back, especially with morning moisture, so a system that’s working by lunchtime still needs testing, string by string, by an engineer.
Optimisers not reporting
If the inverter counts fewer optimisers than you have, or the monitoring shows gaps in the panel layout, one or more optimisers has stopped communicating. It may be a failed optimiser, a loose connector or a pairing problem. Replacing an optimiser means working on the roof, so it needs an engineer and safe access.
Grid faults
SolarEdge inverters check the grid voltage and frequency all the time. If the grid goes down, the inverter reconnects on its own once the supply returns. If the voltage keeps running above the limit, it disconnects to protect itself, and the inverter’s country setting, the AC cabling or the local supply needs checking.
Repair or replace?
We always diagnose first. Many SolarEdge faults turn out to be an optimiser, a connector or a setting rather than the inverter. If the inverter does need replacing, a system with SolarEdge optimisers needs a SolarEdge inverter unless the optimisers are replaced too, and 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.
SolarEdge error codes and what they mean
SolarEdge shows fault codes as two parts separated by an x, such as 2x19 or 18x86, on the inverter’s screen where it has one and in the monitoring platform. Inverters on older firmware show an error number instead.
| Code | What it means | What to do |
|---|---|---|
2x19 | Isolation fault: the panel wiring isn’t properly insulated from earth | Call an engineer. Don’t keep resetting it. |
18x86 | Isolation fault, as shown by inverters on newer firmware | Call an engineer, as for 2x19. |
8x58 | Isolation fault, as shown by three-phase inverters | Call an engineer, as for 2x19. |
2x28 | Grid is down: the inverter can’t see the mains supply | Wait: it reconnects by itself when the supply returns. If there’s no power cut and it doesn’t clear, call us. |
2x21 (also 2x1F, 18x1F, 18x20) | Grid voltage above the limit | Call an engineer to check the country setting, the grid voltage and the AC cable. |
2x20 (also 2x29) | Grid voltage below the limit | Call an engineer to check the country setting and the supply. |
3x9E | The inverter is locked, by a user or by a safety function | Switch the inverter off and on again at its ON/OFF switch. If it locks again, call us. |
| P_OK xxx/yyy, with the first number lower | Not all the optimisers are paired or reporting | Call an engineer to find the optimiser or connector at fault. |
| Inverter not producing (monitoring alert) | The inverter is off, in standby, or getting too little voltage from the panels | If it’s switched off, switch it back on. Standby needs an installer to reactivate it. For low voltage, check for shade, snow or dirt, then call us. |
When to call an engineer
Call us if you see any of these:
- Any isolation fault code, even if it clears later in the day
- Optimisers missing from the monitoring or from the P_OK count
- A grid voltage or frequency code that keeps coming back
- Any code that isn’t in the table, or one that returns after a reset
SolarEdge’s guidance says troubleshooting inside the inverter is for qualified technicians only, after it has been switched off and left five minutes for its capacitors to discharge. Never 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 SolarEdge 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 a SolarEdge isolation fault mean?
It means the inverter has measured a drop in insulation between the panel wiring and earth, usually because of water in a connector, a damaged cable or a faulty optimiser. SolarEdge shows it as 2x19, or 18x86 on newer firmware. It can clear as the day goes on and return the next morning, so the system needs testing rather than repeated resets.
Why are some of my SolarEdge optimisers missing from the monitoring?
An optimiser that isn’t reporting has usually failed, lost its connection or needs pairing again, and the panel behind it may be generating less than it should. We find which optimiser or connector is at fault and reconnect or replace it.
Can you replace a SolarEdge inverter with a different brand?
Only if the optimisers are replaced too. SolarEdge optimisers work with SolarEdge inverters, so on most systems the practical choice is a SolarEdge replacement. We check what’s fitted and explain the options before recommending anything.
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 SolarEdge 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?
What make is your inverter?
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.
Rather talk now? Call 0800 156 0191 — free from UK landlines and mobiles.
You can also reach us through our contact page.