A GFCI outlet can stop working due to several common factors, including age-related degradation of internal electronic components from power surges, moisture ingress or corrosion in damp areas like kitchens and bathrooms, an active ground fault downstream, or improper wiring. Frequent electrical storms and aging MOVs (metal oxide varistors) can also fry the sensitive differential transformers inside the unit over time, causing permanent failure. Verification: Test the unit by pressing the TEST button; if it fails to trip or reset, the internal mechanism has failed and the outlet must be replaced.
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