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#4775858 - 06/02/18 10:07 PM GFCI weirdness
JHZR2 Offline



Registered: 12/14/02
Posts: 41969
Loc: New Jersey
A number of years back, I installed a sub panel in my basement. It runs some 240V AC loads and provides a few circuits. Those circuits are in my basement, one dedicated for the sump pump, one dedicated for the dehumidifier.

The dehumidifier, as a non critical load, is on a gfci since I figure it's on the ground and in case of a flood, I'd like it to trip there asa first line of defense. The gfci and dehumidifier work perfect.

I have another circuit fed from my main panel, which is for other basement outlets. The first outlet in the line is a gfci. Recently the GFCI has been tripping, and my wife has correlated it to when the dehumidifier comes on.

There is no chance of a shared neutral, it doesn't happen any other time, so I assume the one gfci is bad. Any ideas why this would happen? Not only is it two different circuits, but one is actually off a subpanel. I'm tempted to swap the tripping GFCI to a regular outlet, but I'd rather not.

I did have a fluorescent light on a different circuit, which would trip a GFCI outlet on the SAME circuit. I plugged the light in via a surge protector and it has not happened since. I guess it needed the filter. Perhaps it's something like that for the dehumidifier? Even if so, it's different circuits this time, so any startup noise issues would need to resonate all the way to the main panel somehow...

Thanks!

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#4775861 - 06/02/18 10:11 PM Re: GFCI weirdness [Re: JHZR2]
mx5miata Offline


Registered: 03/28/10
Posts: 654
Loc: NY
Check your neutral and ground at the sub panel. Make sure theyre not bonded there


Edited by mx5miata (06/02/18 10:12 PM)
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#4775862 - 06/02/18 10:12 PM Re: GFCI weirdness [Re: mx5miata]
JHZR2 Offline



Registered: 12/14/02
Posts: 41969
Loc: New Jersey
Originally Posted By: mx5miata
Check your neutral and ground at the sub panel. Make sure theyre not bonded there


They're definitely not.

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#4775866 - 06/02/18 10:16 PM Re: GFCI weirdness [Re: JHZR2]
mx5miata Offline


Registered: 03/28/10
Posts: 654
Loc: NY
Normally appliance loads arent on gfci due to the start up load of a motor or compressor could trip the gfci.
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#4775870 - 06/02/18 10:18 PM Re: GFCI weirdness [Re: JHZR2]
mx5miata Offline


Registered: 03/28/10
Posts: 654
Loc: NY
Did you go down the buss bar to check if any lugs come loose over time a loose neutral can cause resistance. And be tripping on ground
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#4775885 - 06/02/18 10:33 PM Re: GFCI weirdness [Re: mx5miata]
JHZR2 Offline



Registered: 12/14/02
Posts: 41969
Loc: New Jersey
Originally Posted By: mx5miata
Normally appliance loads arent on gfci due to the start up load of a motor or compressor could trip the gfci.


Agreed, but since the dehumidifier is in my basement, next to the sump hole (which never has water, fwiw), on the ground, I figure if there ever was water I'd like a GFCI to protect it.

It's not like a freezer or something that could have bad consequences if the GFCI tripped. And it NEVER has.

The GFCI that IS tripping is a basic loop of outlets in my basement, which only feed a few lights and a battery charger. No appliances. Yet it is tripping, even with all loads off!

Originally Posted By: mx5miata
Did you go down the buss bar to check if any lugs come loose over time a loose neutral can cause resistance. And be tripping on ground


No I have not. Good point. But the GFCI that is tripping does so even if all loads on it are off.

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#4775895 - 06/02/18 10:42 PM Re: GFCI weirdness [Re: JHZR2]
mx5miata Offline


Registered: 03/28/10
Posts: 654
Loc: NY
Good chance the gfci is on its way out. Have you had any power surges or lightning lately the logic board inside may have took a hit electricity is a funny thing
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#4775896 - 06/02/18 10:43 PM Re: GFCI weirdness [Re: JHZR2]
nap Offline


Registered: 04/27/18
Posts: 555
Loc: Canada
Let me guess, Leviton brand?

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#4775903 - 06/02/18 10:46 PM Re: GFCI weirdness [Re: JHZR2]
2strokeNorthstar Offline


Registered: 07/19/17
Posts: 303
Loc: PR CA, USA
defective or loose wire at an outlet.

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#4775904 - 06/02/18 10:47 PM Re: GFCI weirdness [Re: JHZR2]
mx5miata Offline


Registered: 03/28/10
Posts: 654
Loc: NY
If the gfci isnt faulty i feel its a neutral related issue.
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#4775913 - 06/02/18 10:58 PM Re: GFCI weirdness [Re: JHZR2]
AZjeff Offline


Registered: 01/14/11
Posts: 2842
Loc: PV Az
Swap your 2 GFCI outlets.
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#4776081 - 06/03/18 08:14 AM Re: GFCI weirdness [Re: JHZR2]
Urshurak776 Offline


Registered: 08/21/12
Posts: 447
Loc: North Carolina
I had a similar problem in my garage. The GFCI outlet kept tripping. Since it was 18 years old I replaced it and haven't had a problem since. I did install a Leviton brand. Is that bad?
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#4776095 - 06/03/18 08:27 AM Re: GFCI weirdness [Re: JHZR2]
Urshurak776 Offline


Registered: 08/21/12
Posts: 447
Loc: North Carolina
I had a similar problem in my garage. The GFCI outlet kept tripping. Since it was 18 years old I replaced it and haven't had a problem since. I did install a Leviton brand. Is that bad?
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2012 Hyundai Santa Fe, 130,000 miles, Havoline Pro DS Full Syn 5W-20, Auto7 Filter.
2014 Kia Rio, 80,000 miles, Havoline Pro DS Syn 5W-30, WIX Filter

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#4776096 - 06/03/18 08:29 AM Re: GFCI weirdness [Re: JHZR2]
Urshurak776 Offline


Registered: 08/21/12
Posts: 447
Loc: North Carolina
I apologize for double post. I tried to delete one but it wont let me.....
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#4776098 - 06/03/18 08:30 AM Re: GFCI weirdness [Re: JHZR2]
SHOZ Offline


Registered: 06/28/03
Posts: 5865
Loc: Illinois
I've had to replace some after nearby lightning strikes.
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