A GFCI trips because it is detecting current leaking to ground, which is exactly its job. Repeated trips usually mean moisture in the outlet, a failing appliance plugged into it, or a GFCI at the end of its life — they wear out at around ten years.
Understand what it is doing before you get annoyed with it
A GFCI compares the current going out with the current coming back. A mismatch of five milliamps — tiny — means some of it is finding another path to ground. In a bathroom that path could be a person. It trips in about a fortieth of a second, and that is the entire reason these are required near water.
A GFCI that trips is doing its job. The question is what it is detecting.
Work through it in this order
1. Unplug everything
Reset it with nothing plugged in. If it holds, plug things back one at a time, using each one for a day. Hair dryers and electric shavers are the usual culprits — heating elements degrade and start leaking to ground long before they stop working.
2. Look for moisture
A GFCI on an exterior wall, or one that trips reliably during or after a shower, is often finding humidity. Check that the box is not open to a wall cavity, and that your fan is actually clearing the room. This is the overlap between an electrical problem and a ventilation problem.
3. Check what else is on it
One GFCI usually protects several downstream outlets, sometimes in more than one bathroom, and occasionally an exterior outlet. An outdoor outlet taking rain will trip the bathroom GFCI it is wired behind. Find every outlet that goes dead when this one trips before assuming the fault is in this room.
4. Consider the age
GFCI devices have a service life. Ten years is a reasonable expectation, less in a humid coastal environment. Nuisance tripping with nothing plugged in, or a device that will not reset at all, usually means the device itself. They are about twenty-five dollars.
Where to stop and call someone
Replacing a like-for-like GFCI is within reach for a confident homeowner with the breaker off and a tester. Stop and call a licensed electrician if you find scorching or a burnt smell, if the wiring is aluminium, if there is no ground wire in the box, or if the breaker itself is tripping rather than the outlet. Those are different problems with worse failure modes.
And note: adding a new outlet or a new circuit in a St. Petersburg bathroom is permitted work. Replacing an existing device is not.
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