Sts does a extremely great job. Thank you.
Roy Morgan · Jul 2026 Google
Problem diagnosis · SolarEdge
SolarEdge red light — what it means and how to diagnose it
Your SolarEdge inverter is showing a red light on the LED panel and you're not sure what it means. Is it dangerous? Can you restart it? We walk through LED patterns, fault codes, and safe troubleshooting — including the critical difference between a grid fault and an arc fault.
Free remote diagnostic £125 only if we fix it remotely
- Covers all HD-Wave models
- No fix, no fee
- Not affiliated with SolarEdge
Red light on your SolarEdge?
Solid or flashing, we help you read the fault code and identify the cause. Share your SolarEdge Go alert or monitoring portal screenshot.
Book remote diagnosticBack to SolarEdge hubSafety: If you see AFCI (arc fault) in SolarEdge Go, do NOT restart. Isolate DC and AC switches and contact an engineer.
⭐⭐⭐⭐⭐ 5-Star Review – Solar Tech Support Installing solar panels is only the first step! To get the best possible performance and maximise your investment, you need to make sure your system is configured correctly and all settings are properly optimised. Solar Tech Support did exactly that for me, and I couldn't be happier with their professional service!** Their knowledge, expertise, and attention to detail helped me optimise my solar system to get the most out of it. If you already have solar panels and battery storage, I highly recommend contacting Solar Tech Support for professional advice, system optimisation, and technical support. Don't just install solar panels – make sure you're getting the maximum benefit from your investment! ⭐⭐⭐⭐⭐ Highly recommended! Thank you, Solar Tech Support, for your excellent service!
Karolis Bagdonas · Oct 2026 Google
Amazing support, went out of his way to help try and get us back up and running
Paul Smith · May 2026 Trustpilot
I contacted Solar Tech Support with an issuewith my solar and Ron went out of his way to help me. Despite the fact that I'm situated hundreds of miles away and he knew there'd be no business opportunity from my inquiry, Ron still chased solutions and helped me get an understanding of what I needed to do. I love working with people like this, people with integrity and service at the heart of what they do. I just wish hew was nearer!
Kevin O'Hara · Aug 2026 Google
quick service - sorted in 30 mins. well worth saving yourself hours of reading Facebook forums! thanks
MinosSpeaks · Sep 2026 Google
Absolute legend found the fault in 5mins definitely will be using again definitely would recommend to others .
namas raw feeders · Sep 2026 Google
Safety: If SolarEdge Go shows "Arc Fault Detected" (AFCI), do NOT restart the system repeatedly. AFCI is a safety protection indicating a potential dangerous condition. Isolate the DC and AC switches and contact a qualified engineer immediately.
Diagnostics
5-step guide to SolarEdge red light diagnosis
Work through these steps in order. The fault code from SolarEdge Go or the monitoring portal is your key to understanding the exact issue.
1
Observe the LED pattern — solid or flashing?
Look at the red light on the inverter's LED panel. Is it:
Solid Red
The inverter has a persistent fault and has stopped producing. This requires investigation or intervention.
Flashing Red
The inverter has a transient fault and is attempting recovery. Often clears automatically in 5–10 minutes.
In both cases, immediately open SolarEdge Go or the monitoring portal to find the exact fault code — this will tell you the cause.
2
Check SolarEdge Go or monitoring portal for the fault code
Open SolarEdge Go (via Bluetooth) or the online monitoring portal (monitoring.solaredge.com). Look for the Alerts, Status, or Error Code section. Write down the exact code. Common red-light codes are:
Grid voltage / frequency = Supply outside limits, inverter disconnecting
Arc Fault Detected = AFCI trip. Safety critical: isolate, do not reset
Isolation fault = DC isolation or grounding issue
AC overcurrent = Excessive AC current
Pairing failed = Optimiser communication issue
Note: If no fault code appears in SolarEdge Go but the LED is red, try closing and reopening the app, or refreshing the monitoring portal.
3
Identify which LED is red — DC, communication, or AC/grid?
SolarEdge inverters have three LEDs: DC (usually leftmost), Communication (middle), and AC/Grid (usually rightmost). Each turns red when that system has a fault. Look at the inverter panel and note which LED is red:
Red DC LED: DC power issue — DC isolator off, blown fuse, or wiring fault. Check DC input voltage in monitoring.
Red Comm LED: Communication or DC issue — optimiser fault, communication loss, or grounding issue. Check SolarEdge Go for a pairing failure or an Arc Fault Detected alert.
Red AC/Grid LED: Grid fault — voltage over/under limit, frequency issue, or isolation fault. Check monitoring for grid voltage and frequency readings.
4
For grid faults (flashing red) — wait and monitor
If the monitoring portal shows a grid voltage or frequency fault and the red light is flashing, this is usually a brief grid quality issue. The inverter is designed to disconnect if grid voltage goes outside safe limits (typically 207–253V for single-phase UK) — this is a safety feature. Here's what to do:
1. Wait 5–10 minutes — The inverter will automatically retry connection once grid voltage normalises.
2. Check the monitoring portal — Does the grid voltage reading now show 230V (or your normal supply voltage)? Is the red light gone?
3. If it clears — The fault was transient and has self-resolved. No action needed.
4. If it persists — The grid voltage is consistently outside limits. This may indicate a local grid infrastructure issue or a problem with your inverter's grid connection. Contact your installer or DNO (Distribution Network Operator).
Do NOT restart the inverter repeatedly if you see a grid fault code — wait for it to recover naturally.
5
For AFCI faults (arc fault) — DO NOT restart — ISOLATE IMMEDIATELY
If SolarEdge Go or the portal shows "Arc Fault Detected", this is a safety event, not an arbitrary trip. Arc fault detection (AFCI) means the inverter detected abnormal current patterns on the DC side — typically a damaged cable, corroded connector, or failed optimiser. Do not attempt to restart or reset the system.
1. Immediately switch off the DC isolator — This is the most important safety step.
2. Switch off the AC isolator — Isolate both sides of the system.
3. Contact a qualified solar engineer — Do not restart, do not investigate the DC wiring yourself.
4. Do not open the inverter enclosure — High voltage hazard. Let the engineer investigate.
AFCI faults require on-site investigation to identify the underlying wiring or component issue. Repeated resets without fixing the cause can lead to further damage or safety risks.
How SolarEdge LED status works
SolarEdge inverters use three LED indicators on the front panel, each representing a different system: DC power, internal communication, and AC grid connection. When operating normally, all three are green. A red light on any of these indicates a fault in that system. The monitoring portal or SolarEdge Go provides the specific fault code — the LED colour and pattern narrow the category, but the code tells you the exact problem.
The key distinction is between transient faults (flashing red) and persistent faults (solid red). Flashing red usually means the inverter is attempting recovery — most often from a brief grid quality dip. Solid red means the fault is persistent and the inverter has stopped producing. A solid red light that doesn't clear within 10–15 minutes requires investigation.
Arc Fault Circuit Interrupter (AFCI) is a critical safety feature. Unlike other fault codes, arc faults should never be ignored or reset repeatedly. AFCI detection means the inverter has identified abnormal current patterns consistent with an arc in the DC wiring — a serious electrical hazard. The system stops producing to prevent further damage. Investigation and repair by a qualified engineer is mandatory.
Back to
Return to the SolarEdge brand hub to explore other common faults and services.
SolarEdge support hubSolarEdge red light questions
First, determine if the red light is solid or flashing. Solid = persistent fault, the inverter has stopped producing. Flashing = transient fault, inverter is attempting recovery. Immediately open SolarEdge Go or the monitoring portal to read the fault code. The code tells you the exact cause. If you see "Arc Fault" (AFCI), isolate the DC and AC switches immediately — do not restart.
It depends on the cause. A red light from a grid fault (over/under voltage) is safe — the inverter is protecting itself. A red light from an arc fault (AFCI detection) IS potentially dangerous — it indicates abnormal current patterns suggesting a possible arc in the DC wiring. Arc faults require immediate isolation and engineer investigation.
No. AFCI is a safety protection indicating a potential dangerous condition. Do not reset repeatedly without identifying the cause. Isolate the DC and AC switches immediately and contact a qualified engineer. Repeated resets without addressing the underlying issue can cause further damage and increase safety risks.
Solid red = the inverter has a persistent fault and has stopped producing. Flashing red = the inverter has detected a transient fault (usually a brief grid quality issue) and is attempting to recover automatically. Flashing red often clears on its own within 5–10 minutes when the condition normalises. Solid red usually requires intervention or investigation.
The remote diagnostic is free — send us the fault code from SolarEdge Go or a monitoring screenshot and we'll tell you what the red light means at no charge. A lot of red lights are grid-voltage events that clear themselves, or a settings issue we can sort remotely for a flat £125, with nothing to pay if we can't fix it remotely. The exception is an arc fault (AFCI) or an isolation fault — physical DC-side safety faults that need an on-site visit, quoted up front from £295. Full pricing →
Usually the same day for anything we can read remotely. Once we have the fault code we can tell you straight away whether it's a transient grid event that will clear on its own, a settings or grid-parameter fix we can do in a remote session, or a safety fault that needs isolating and an engineer. If it's an arc or isolation fault, leave the system isolated and we'll book the earliest on-site slot — don't keep resetting it.
Book
Need help with SolarEdge red light?
Share your SolarEdge Go fault code or monitoring screenshot. We identify what the red light means and guide you through the next steps.
- No fix, no fee
- Fault code interpretation
- Safe troubleshooting path
Service notice
We’re busier than ever. Thank you for your patience.
Due to unprecedented demand we’re currently only carrying out on-site work in Yorkshire, and replies are taking up to 7 days. Remote diagnostics continue for the whole UK as normal.
Every message is read and answered, so please don’t send it twice; that only slows the queue.
Ronald Director, Solar Tech Support
On-site: Yorkshire only, for now
Remote: UK-wide, as usual
Remote fix: £125 if we fix it, no charge if we don’t
Replies: within 7 days
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