What condition should lead to immediate replacement of a GFCI breaker or receptacle?

Immediate replacement of a GFCI (Ground Fault Circuit Interrupter) breaker or receptacle is warranted when it fails to trip and reset properly. The primary function of a GFCI device is to detect imbalances between the outgoing and incoming current, which indicates a ground fault or potential shock hazard. If the device does not trip when it should, it poses a significant safety risk, as it will not provide the necessary protection against electrical shocks, which are critical in wet areas like kitchens and bathrooms.

In this scenario, a proper functioning GFCI is vital for safeguarding against electrical hazards that can result from ground faults. Hence, if these devices do not operate correctly, immediate replacement is essential to ensure the safety of the occupants.

While physical damage could also necessitate replacement, a malfunctioning GFCI in terms of trip and reset capability directly impacts its primary safety function. Incorrect installation might require correction but does not mandate immediate replacement if the device is otherwise functional. An outdated model might not meet current standards, but it wouldn’t need to be replaced unless it also fails to operate correctly. Therefore, the malfunctioning aspect directly tied to the safety function is the most critical factor in determining the need for immediate replacement.