LED flash codes are sequences of light blinks emitted by LEDs on hardware devices, such as computers, servers, or networking equipment, to indicate specific errors or operational states. When a device encounters a problem, it may not be able to display error messages on a screen. Instead, it uses a predefined pattern of LED flashes to communicate the nature of the issue. Each pattern corresponds to a particular error, such as memory failure, overheating, or power supply issues. Technicians or users can refer to the device's manual or manufacturer documentation to interpret these codes and diagnose the problem. LED flash codes are especially useful for troubleshooting hardware that cannot boot or display standard error messages.