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Old 07-24-2008, 04:06 PM   #1
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GFCI light switch trips once per night ????


I just installed a GFCI outlet in a remodelled bath. From the GFCI, the line goes to a dimmer switch (for vanity lights) and from there to two switches (bath ceiling vent fan & light). The little light on the outlet is lit. All day long I can switch everything off and on endlessly and all works great. I can run power tools off the outlet. But at night, after everyone has gone to bed, if someone goes in and flips a light switch, the GFCI will trip off. Pressing the reset button restores power and you can again flip switches endlessly with no problem -- until the am hours the next night. This has happened every night for the last 5 nights.

Nothing else is on this circuit. It is a 20 amp breaker, 12-2 gauge wire. It runs directly from the breaker to the GFCI outlet. Does have a junction box along the run where I had planned to branch off of - but didn't.

I have no idea what could be doing this. Anyone else ?????????

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Old 07-24-2008, 04:23 PM   #2
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GFCI light switch trips once per night ????


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Originally Posted by mw6263 View Post
I just installed a GFCI outlet in a remodelled bath. From the GFCI, the line goes to a dimmer switch (for vanity lights) and from there to two switches (bath ceiling vent fan & light). The little light on the outlet is lit. All day long I can switch everything off and on endlessly and all works great. I can run power tools off the outlet. But at night, after everyone has gone to bed, if someone goes in and flips a light switch, the GFCI will trip off. Pressing the reset button restores power and you can again flip switches endlessly with no problem -- until the am hours the next night. This has happened every night for the last 5 nights.

Nothing else is on this circuit. It is a 20 amp breaker, 12-2 gauge wire. It runs directly from the breaker to the GFCI outlet. Does have a junction box along the run where I had planned to branch off of - but didn't.

I have no idea what could be doing this. Anyone else ?????????
Most likely a problem with moisture in the exhust fan.

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Old 07-24-2008, 04:40 PM   #3
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GFCI light switch trips once per night ????


"From the GFCI, the line goes to a dimmer switch (for vanity lights) and from there to two switches (bath ceiling vent fan & light). All day long I can switch everything off and on endlessly and all works great. I can run power tools off the outlet. But at night, after everyone has gone to bed, if someone goes in and flips a light switch, the GFCI will trip off. Pressing the reset button restores power and you can again flip switches endlessly with no problem -- until the am hours the next night. This has happened every night for the last 5 nights."

If the "light switch" that's flipped is on the dimmer, the dimmer switch may be generating interference which fools the GFI. The dimmer people might have a service bulletin out on this.

You might also check if the problem appears with the dimmer full on, or full off.
Also, before flipping the light switch, push test and reset and see if this stops the GFI from its expected shutoff after the switch is flipped.
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Old 07-24-2008, 04:50 PM   #4
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GFCI light switch trips once per night ????


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Originally Posted by Yoyizit View Post
"From the GFCI, the line goes to a dimmer switch (for vanity lights) and from there to two switches (bath ceiling vent fan & light). All day long I can switch everything off and on endlessly and all works great. I can run power tools off the outlet. But at night, after everyone has gone to bed, if someone goes in and flips a light switch, the GFCI will trip off. Pressing the reset button restores power and you can again flip switches endlessly with no problem -- until the am hours the next night. This has happened every night for the last 5 nights."

If the "light switch" that's flipped is on the dimmer, the dimmer switch may be generating interference which fools the GFI. The dimmer people might have a service bulletin out on this.

You might also check if the problem appears with the dimmer full on, or full off.
Also, before flipping the light switch, push test and reset and see if this stops the GFI from its expected shutoff after the switch is flipped.
This is just nonsense... Here we go again.... Welcome to "GFCI 101"
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Old 07-24-2008, 05:02 PM   #5
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GFCI light switch trips once per night ????


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This is just nonsense... Here we go again.... Welcome to "GFCI 101"
Ad hominem
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Old 07-24-2008, 05:13 PM   #6
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GFCI light switch trips once per night ????


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Ad hominem
Your right, my gfci's always trip also when I turn on a dimmer, or a motor, or an appliance, or anything for that matter, not even sure why they make the damn things...
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Old 07-24-2008, 05:22 PM   #7
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GFCI light switch trips once per night ????


Agree with Chris ....humidity problem. You have your lights wired to the load side of the gfci. Move the cable to the lights to the line side of the gfci. GFCI protection for the lights and fan is not required. You will still have the receptacle (gfci) protection. Checking the venting on your fan might help also if you keep the protection. I wouldn't....this is an example of wiring lights to your gfci load side you get left in the dark when your trying to take care of business.......ie..my aim is good but I like to see what I'm shooting at....

Last edited by Stubbie; 07-24-2008 at 05:32 PM.
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Old 07-24-2008, 05:24 PM   #8
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GFCI light switch trips once per night ????


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Your right, my gfci's always trip also when I turn on a dimmer, or a motor, or an appliance, or anything for that matter, not even sure why they make the damn things...
Here's a better one. . .
"I beseech you in the bowels of Christ, think it possible you may be mistaken."
but the ad hominem still applies, especially
"It is also used when an opponent is unable to find fault with an argument, yet for various reasons, the opponent disagrees with it."

I guess all posts, all the time, can't be about technical stuff!!!

My apologies to the original poster for getting off topic. In this case I felt it was necessary.
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Old 07-24-2008, 05:27 PM   #9
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GFCI light switch trips once per night ????


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Your right, my gfci's always trip also when I turn on a dimmer, or a motor, or an appliance, or anything for that matter, not even sure why they make the damn things...
Yeah and that goes for gfci breakers too.....can't have dimmers on those by golly......jeeeez... yoyizit give us a break.
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Old 07-24-2008, 05:34 PM   #10
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GFCI light switch trips once per night ????


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give us a break.
Your wish has been granted: for this post, forever; otherwise, 24 hours on the condition that you let me know what finally fixed this GFI problem.
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Old 07-24-2008, 08:09 PM   #11
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GFCI light switch trips once per night ????


Thanks to all. I thought that a switch -- being so close to a sink (and right next to the GFCI outlet) required the same protection. I'll disconnect the switches from the outlet this weekend.
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Old 07-25-2008, 12:05 PM   #12
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GFCI light switch trips once per night ????


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Originally Posted by Yoyizit View Post
Here's a better one. . .
"I beseech you in the bowels of Christ, think it possible you may be mistaken."
but the ad hominem still applies, especially
"It is also used when an opponent is unable to find fault with an argument, yet for various reasons, the opponent disagrees with it."

I guess all posts, all the time, can't be about technical stuff!!!

My apologies to the original poster for getting off topic. In this case I felt it was necessary.
This is a DIY forum. We are not exactly dealing with Tesla's theories here. Plain simple advice, thats all.

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