A GFCI that trips is doing exactly what it is designed to do: interrupt power when it detects current leaving the intended electrical path. One trip may have an obvious cause, such as wet outdoor equipment. A GFCI that repeatedly trips, immediately retrips, or will not reset deserves diagnosis rather than repeated resetting or bypassing the protection.
What Does a GFCI Actually Detect?
A ground-fault circuit interrupter compares the current leaving on the ungrounded conductor with the current returning on the grounded conductor. If enough current is missing from the return path, the device assumes some current may be flowing somewhere it should not and opens the circuit quickly.
That is different from a standard circuit breaker, which primarily protects conductors from excessive current. A circuit can have a ground-fault problem without drawing enough current to trip an ordinary breaker.
Common Reasons a GFCI Keeps Tripping
Moisture is a common cause, particularly at outdoor receptacles, garages, basements, kitchens, bathrooms, crawlspaces, and other damp locations. Water in an appliance, cord, receptacle, box, or connected equipment can create leakage current that the GFCI detects.
A connected appliance can also be the problem. Refrigerators, sump pumps, dehumidifiers, coffee makers, outdoor tools, pressure washers, and other equipment can develop leakage or insulation faults even when they appear to operate normally.
The fault may also be downstream from the GFCI itself. One GFCI receptacle can protect additional ordinary-looking receptacles farther along the circuit. That is why several outlets can go dead when one GFCI trips, and why the device causing the trip may not be plugged into the receptacle with the TEST and RESET buttons.
Damaged wiring, improper connections, or a failing GFCI device can also cause repeated trips.
Why Did Several Outlets Go Dead at Once?
A GFCI receptacle can protect other receptacles connected to its load side. The tripped GFCI may therefore be in another room, a garage, basement, bathroom, or exterior location while the dead outlet is somewhere else.
If a breaker has also tripped, that is a different protective function. See our guide on why breakers keep tripping for more information.
What Can I Safely Check?
You can unplug portable equipment from the affected receptacles, look for obvious external moisture, and try the GFCI RESET button once after the obvious cause has been removed.
If it immediately trips again, will not reset, trips with portable loads unplugged, shows heat or discoloration, smells burned, or the cause is not obvious, stop resetting it and have the circuit evaluated.
Do not defeat the GFCI, replace it with an ordinary receptacle merely to stop the tripping, or increase breaker size as a workaround. A protective device that keeps opening is giving you information, not submitting a complaint form.
What About Older Two-Prong Outlets?
GFCI protection can be used in certain code-compliant situations involving older ungrounded receptacle circuits, but GFCI protection does not create an equipment-grounding conductor. Our article on two-prong outlets explains that distinction in more detail.
When Should I Call an Electrician?
Have the circuit checked when the GFCI repeatedly or immediately trips, refuses to reset, trips with equipment unplugged, is exposed to water intrusion, shows heat or damage, or when multiple outlets or circuits behave unexpectedly.
Bottom Line
A GFCI that keeps tripping may be reacting to moisture, a faulty appliance, downstream equipment, damaged wiring, an improper connection, or a failed GFCI device. The important part is determining why it is opening rather than simply finding a way to make it stay on.
Request a consultation with State of the Arc Electric if a GFCI keeps tripping or a group of receptacles has unexpectedly lost power.