A yellow indicator light on certain GFCI models typically serves as an end-of-life warning, a tripped protective state, or an indication of a failed internal self-test monitoring system. When the internal circuitry detects that its automatic monitoring components can no longer guarantee safe ground-fault protection, it enters a locked lockout state that intentionally cuts off electrical power to prevent shock hazards. Verification: Attempt to press the RESET button; if it refuses to latch or the yellow light persists, the internal sensors are permanently burned out and the unit must be replaced.
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