SolarEdge Error 40 and Islanding Codes: What They Mean
SolarEdge codes 40, 2x28, 144 and 2x90 are islanding codes: the grid is down or unstable. The inverter restarts on its own when the grid returns.
What it means
These codes mean the grid is down or unstable.
Once the grid returns, the inverter restarts on its own, so waiting for the grid is the step.
What you can safely try
These steps may be all you need:
- Check whether the utility power is out in your home or neighborhood.
- Wait for the grid to return. The inverter restarts on its own.
Grid or AC voltage codes are different. Codes 31, 32, 33, 41, 2x1F, 2x20, 2x21 and 2x29 (grid or AC voltage too high or too low) need a licensed technician, with no homeowner steps.
When to stop and call
Stop and call us if:
- The islanding code keeps happening after the grid is back. Book a technician or contact your utility; SolarEdge's guidance is to consult the grid operator.
- A grid or AC voltage code appears.
- During an outage, a System overload stays locked after you cut back, or you see Backup disabled or Backup failed.
- A burning smell, smoke, sparks, heat, buzzing, melting, water on or in equipment, or visible damage: stay away from the equipment, keep children and pets away, call 911 if there is smoke or fire, and book an urgent technician visit.
More error code help
More codes are in our guide to SolarEdge error codes, and every brand is in our solar and battery error codes guide.
Frequently Asked Questions
What does SolarEdge error 40 mean?
Code 40 is an islanding code: the grid is down or unstable. The inverter restarts on its own when the grid returns.
Will my SolarEdge inverter restart by itself after an outage?
For islanding codes, the inverter restarts on its own when the grid returns. If the code keeps happening after the grid is back, book a technician or contact your utility.
Are SolarEdge voltage codes the same as islanding codes?
No. Grid or AC voltage too high or too low codes (31, 32, 33, 41, 2x1F, 2x20, 2x21, 2x29) need a licensed technician.
My SolarEdge battery is not working in backup mode. What should I do?
The Home Battery not working in backup mode, and Backup disabled or Backup failed alerts, need a technician. Book a diagnostic visit.
What should I do about a SolarEdge System overload during an outage?
Reduce what is running on backup power. If it stays locked, book a technician.
Send Sunny a photo
Not sure which alert you are looking at? Sunny, the chat assistant on this site, can read a photo of the screen. Open the chat on this page, tap the paperclip, and send a photo of your app or the equipment screen. Sunny answers day or night, tells you what the alert generally means and whether there is a safe step to try, and can take your address and a good time for a technician if one is needed.
Book a diagnostic
If the alert keeps coming back, or the steps above do not clear it, book a $395 on-site diagnostic visit. A licensed technician looks at the system and you get a written report with photos. Call or text (813) 285-4505, or request a visit on our solar repair page or our contact page. To keep a working system in good shape, see our solar maintenance plans.
About us: Fused Solar and Roofing is a licensed electrical, roofing and building contractor (EC13014750, CCC1331058, CBC1252064) serving Hillsborough, Pinellas, Pasco and Manatee counties since 2007, and certified with SolarEdge.
