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Seeing a red light on your solar inverter can be a little alarming—but it's not always a sign of something serious. In many cases, it's just your system's way of letting you know it noticed something out of the ordinary.
Issues with wiring or electrical problems in the power system connected to the solar inverter can trigger the fault indicator to illuminate. Wrong wiring or electrical issues in the system can lead to the fault indicator turning on. If there are problems with the wiring or electrical components in the system, the fault indicator may be activated.
*Example of an SMA inverter, with error 7702 – this inverter needs to be replaced If your inverter is showing a red light, start with a Power Cycle: Turn off the AC disconnect circuit breaker supplying power to the inverter. There should be an “AC DISCONNECT” sticker located on the box, typically right next to the inverter.
Check the inverter's light at different times, especially when it's sunny, to see if it turns green. It's a good idea to do this regularly. During certain times of the year like mid-winter, the solar panels may receive insufficient sunlight. This can cause a temporary system shutdown.