You have a ground fault, open the boxes and test with a ohmmeter. you may find there is other stuff on the circuit. In older construction, they put the garage and outside receptacles on the bath GFCI
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Nope, through other incidents I know those are all on their own circuits. 
Can you describe what exactly to test with an ohmmeter? Like what should be tested and what results indicate what? Thanks!
Oh, just for info this is 2002 construction.
Can you describe what exactly to test with an ohmmeter? Like what should be tested and what results indicate what? Thanks!
Oh, just for info this is 2002 construction.
One way to test for a ground fault using an ohmmeter on a downstream protected NM cable run is to disconnect the downstream neutral conductor at the GFCI receptacle box. With power off, check the resistance between the hot and ground and also between the neutral and ground. Anything other than infinity is considered a fault.Nope, through other incidents I know those are all on their own circuits.
Can you describe what exactly to test with an ohmmeter? Like what should be tested and what results indicate what? Thanks!
Oh, just for info this is 2002 construction.
Firstoff, you don't have a ground fault. Remember the Golden Rule of GFCIs: Ground faults only happen to other people. MY appliances are fine; it's the GFCI's fault somehow!
Seriously, though, you already blew right past the most basic 3 tests for a GFCI when it trips.
1. Unplug everything and see if it still trips.
2. Identify the downline and unplug everything there, and see.
3. Remove it from the wall and remove everything from the LOAD terminals. Everything including neutrals.
If it still trips after #3, into the trash it goes.
Otherwise the GFCI is fine. You're "other people"
It's the wiring, or hardwired appliances. (Which we know because we eliminated the plug-in appliances in steps 1-2). Then you go 50% of the way down the downline, sever hot AND NEUTRAL there (turning off power in between, obviously!) and re-test. Now you know which half the problem is in. Divide that half in half, rinse wash repeat. At some point, removing one thing will make it stop tripping. *cough*bathroom fan*cough* Oh yeah, anything like that!
Low resistance to ground is conclusive. Showing open is not conclusive. Many insulation failures are voltage-sensitive, that's why megaohmmeters are a thing. (they shock the circuit with 125, 250, 500 or 1000V).
You are absolutely right. I just happened to have a brand new outlet on hand so my brain went there first.Firstoff, you don't have a ground fault. Remember the Golden Rule of GFCIs: Ground faults only happen to other people. MY appliances are fine; it's the GFCI's fault somehow!
Seriously, though, you already blew right past the most basic 3 tests for a GFCI when it trips.
1. Unplug everything and see if it still trips.
2. Identify the downline and unplug everything there, and see.
3. Remove it from the wall and remove everything from the LOAD terminals. Everything including neutrals.
If it still trips after #3, into the trash it goes.
Otherwise the GFCI is fine. You're "other people"
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