A flashing red and green (or alternating color) indicator light on a modern self-testing GFCI outlet signifies a critical internal hardware malfunction or an end-of-life failure. This blinking pattern indicates that the device's automated periodic self-test routine has failed, meaning the internal silicon chips and monitoring relays can no longer reliably detect dangerous ground faults or leakage currents. Verification: Perform a manual trip test by pressing the TEST button; if the unit fails to trip or the flashing light continues unabated, replace the receptacle immediately.
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