A red light could mean a range of things: a temporary glitch, a false alarm (also called a nuisance trip), a utility grid hiccup, or even a software update in progress. In many cases, it's just your system's way of letting you know it noticed something out of the ordinary. This could relate to input voltage variations, 3. Among these issues, input voltage variations. If your solar inverter shows a red light blinking, it usually indicates a fault or system issue that needs attention. The following tables detail the possible LED and switch combinations, and what they mean. It could be related to varying weather conditions, seasonal changes, or actual system faults like electrical issues, software glitches, or component malfunctions.