If your solar inverter shows a red or orange light, an error code, or your monitoring app says production is zero, start with the simple checks: confirm the power is back on from the utility, make sure the solar breaker and AC disconnect are on, write down the exact code, and restart the system using the shutdown and startup steps in your inverter manual. If the fault comes back, or the code points to a ground, isolation or arc fault, stop there and have a licensed solar contractor look at it. Many faults clear on their own after a grid problem; repeat faults usually mean something on the system needs repair.
What an inverter does and why it reports faults
Solar panels produce direct current (DC). Your home and the grid run on alternating current (AC). The inverter converts one to the other, and it is also the part of the system that watches for anything unsafe. If grid voltage or frequency drifts out of range, if it detects current leaking to ground, or if it senses an electrical arc, it shuts down and logs a fault. That makes the inverter the first place to look when something is wrong, even when the inverter itself is fine.
Homes in the Panhandle usually have one of three setups:
- String inverter: one box, usually on an outside wall near the meter or in the garage, with a display or status lights.
- Microinverters: a small inverter under each panel, with a gateway or combiner box near the main panel that reports to an app.
- Hybrid or battery inverter: handles both solar and a home battery, and may show faults for either one.
The checks below apply to all three, but the codes and the exact restart order differ by brand, so keep the manual (or the manufacturer's online version) handy.
Step 1: Check whether the grid caused it
Grid-tied inverters are required to shut off when utility power goes out, so they do not send power onto lines that crews may be working on. After the power comes back, the inverter waits until the grid has been stable for a set period before it reconnects, often several minutes. During that wait you may see messages such as "grid lost", "no utility", "AC voltage out of range" or "frequency out of range".
If there was a storm, a flicker, or planned utility work, give the system time to restart on its own. If your neighbours also lost power, check your utility's outage map before doing anything else. A grid fault that clears by itself is normal and is not a sign of a problem with your panels.
If grid voltage faults show up often on sunny afternoons with no outages, mention it to both your installer and your utility. It can point to wiring or voltage issues on either side of the meter, and it is worth having someone measure rather than guess.
Step 2: Check breakers, disconnects and the rapid shutdown switch
A surprising number of "dead" systems are simply switched off. Walk the system and check:
- The solar breaker in your main panel (often labelled PV, solar or inverter). If it has tripped, reset it once. If it trips again, leave it off and call for service.
- The AC disconnect near the meter or inverter. Lawn crews, pressure washers and painters sometimes turn these off and forget.
- The rapid shutdown initiator, usually a red or labelled switch near the meter. If it has been pushed or turned off, the panels will not produce power.
- The DC switch on a string inverter, if it has one.
Only operate switches that are clearly labelled and meant for homeowner use. Do not open any cover that needs a tool.
Step 3: Write down the code before you restart
Before you reset anything, take a photo of the display or a screenshot of the app. Restarting can clear the active message, and the exact wording or number is what a technician needs. Note the date, time and weather too. A fault that only appears on hot afternoons, or only after heavy rain, tells a different story from one that appears at random.
Common categories you will see, whatever the brand calls them:
| Fault type | What it usually means | Homeowner action |
|---|---|---|
| Grid, voltage or frequency | Utility power was out or out of range | Wait for automatic reconnect; call if it repeats often |
| Isolation, insulation or ground fault | Current is leaking to ground somewhere in the DC wiring | Do not keep resetting; call a licensed contractor |
| Arc fault | The inverter detected arcing, often a loose or damaged connection | Leave it off; call a licensed contractor |
| Over-temperature | The inverter is too hot and is limiting or stopping output | Check vents and clearance; call if it repeats |
| Communication or no data | The monitoring link is down, not necessarily the system | Check Wi-Fi and the gateway |
Step 4: Restart the system the right way
Most manufacturers publish a specific shutdown and startup order, and following it matters. A typical sequence is to turn off the AC side first (the solar breaker or AC disconnect), then the DC switch if there is one, wait a few minutes, and then turn things back on in reverse order. Some brands specify a different order, so use the one in your manual.
After restarting, watch the status light or app for the next hour of good sun. If the system comes back and stays up, the fault was probably temporary. If the same code returns, do not keep cycling it. Repeated resets can hide a real problem and, for ground or arc faults, can be unsafe.
Faults that need a technician, not a reset
Some faults are the inverter doing its job by warning you about a hazard. Treat these as a reason to call:
- Ground or isolation faults, especially after heavy rain. In the humid Panhandle climate these often trace back to a damaged wire, a connector that has let in water, or wiring chewed by squirrels under the array.
- Arc faults, which point to loose or damaged connections. These are a fire-safety concern.
- A tripping solar breaker that will not stay on.
- Burn marks, a hot smell, buzzing or visible damage on any part of the system.
- One or more microinverters reporting no production while the rest work.
Remember that panels produce DC voltage whenever light hits them, even with every switch off. Never touch connectors, open junction boxes or go on the roof to look. Diagnosing these faults takes test equipment and training.
When the problem is the monitoring, not the system
A "no data" or "offline" message in the app often means the system is producing but cannot report. Common causes are a new internet router, a changed Wi-Fi password, a gateway that lost power, or a router moved further from the gateway. Check whether the inverter itself shows normal status lights. If it does, reconnecting the gateway to Wi-Fi (using the manufacturer's instructions or app) usually fixes it.
It is still worth fixing quickly. Without monitoring, a real fault can go unnoticed for weeks, and in a Florida summer that is a lot of lost production. Compare your production with your utility bill as a second check: if your bill jumps while the app shows nothing, something has changed.
Older and orphaned systems
Inverters are usually the first major component on a solar system to need replacement, often well before the panels. If your inverter is many years old, shows repeated faults, or the manufacturer no longer supports it, a repair may not be the best value, and a replacement may need to be matched to the existing panels and wiring.
Many Panhandle homeowners also own systems whose original installer has closed or stopped answering. That does not mean the system cannot be fixed. MSM Solar repairs systems of any brand and age, including orphaned systems. See our solar service calls page for how a visit works, and our post on inverter clipping if your system is producing but seems to top out on bright days.
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Frequently asked questions
Is it safe to reset my solar inverter myself?
Turning labelled breakers and disconnects off and on, following the manufacturer's restart steps, is generally fine for homeowners. Do not open the inverter or any box that needs a tool, and do not keep resetting a ground fault or arc fault.
Why did my inverter shut off after a power outage and not come back?
Inverters wait for stable grid power before reconnecting, which can take several minutes. If it has been well over an hour of good sun after power returned, check the solar breaker and AC disconnect, then try the restart steps. If it still will not reconnect, call for service.
Does a fault light mean my panels are damaged?
Not usually. Many faults come from the grid, a tripped breaker or wiring. Panels themselves are rarely the cause, but storm damage or animal damage to wiring under the panels can trigger ground faults.
How do I know if I am losing money while the system is down?
Your monitoring app and utility bill will both show it. Any day the system is off, your home draws all of its daytime power from the utility, so a quick repair matters more in the long, sunny months.
Conclusion
MSM Solar works with homeowners in Cantonment, Mary Esther, Mexico Beach, Panama City and Perdido Key, and in every town between Pensacola and Apalachicola.
Most inverter error lights have a simple explanation: a grid outage, a switch that got turned off, or a monitoring link that dropped. Check those first, note the exact code, and restart using your manual's steps. If the fault returns, or it is a ground, isolation or arc fault, leave the system off and get a licensed contractor to find the cause. MSM Solar is a Florida Certified Solar Contractor (license CVC57236) based in Crestview and services homeowners across the Panhandle, including Crestview, Niceville and Milton. Service-call pricing is quoted up front, and a real person calls back within 2 business days. Call (850) 737-5197 to describe your fault code and set up a visit.