Solar Inverter Warning Lights: What Red and Yellow Actually Mean
The inverter is where solar problems announce themselves. Here's what the common light states mean across major brands, what you can safely do yourself, and what needs a licensed tech.
The common states
| Light state | Usual meaning |
|---|---|
| Solid green | Producing normally |
| Blinking green | Startup, low light, or standby — normal at dawn/dusk |
| Yellow/amber | Grid event, ground fault warning, or communication issue |
| Red / fault | Shutdown: ground fault, arc fault, or internal error |
| No lights | No AC power — check breakers and disconnects |
Safe DIY steps
- Note the fault code from the display or app before doing anything.
- Perform one clean restart per the manual: AC breaker off, DC disconnect off, wait 5 minutes, reverse order back on.
- If the fault returns, stop. Repeated resets of ground-fault or arc-fault conditions can mask a real fire risk.
Call a licensed tech for
- Ground fault or arc fault codes that persist after one restart
- Any burning smell, scorch marks, or buzzing
- Error codes pointing to DC string faults
- Inverters past 10 years with recurring shutdowns — replacement territory ($1,500–$3,500 installed for most string inverters)
Original installer gone? Solar Relief connects you with techs who service orphaned systems and handle manufacturer warranty claims.
Frequently asked questions
Can I reset my solar inverter myself?
One clean restart per the manual is safe: AC off, DC off, wait five minutes, reverse. If the fault returns, stop and call a licensed technician.
What does a red light on my inverter mean?
A fault shutdown — commonly ground fault, arc fault, or internal error. Persistent ground/arc faults are potential fire risks and need professional diagnosis.