A GFCI receptacle needs to be replaced when it fails basic diagnostic safety checks, such as failing to trip when the TEST button is pressed, refusing to hold the RESET position, or displaying a blinking red end-of-life warning light. Additionally, physical damage such as cracking on the thermoplastic housing, scorch marks, or a loose faceplate that fails to grip plug prongs securely indicates internal wear. According to electrical safety standards, GFCIs should also be manually tested monthly and replaced every 10 to 15 years. Verification: Perform a manual trip test using the test and reset buttons; failure of either action confirms that the unit requires immediate replacement.
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