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Old 11-15-2011, 09:46 PM   #1
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new bathroom vent trips GFI when switch is turned off.


Recently replaced a cheap, loud bathroom vent with a nice quite (.8 sone) model. Like the replaced one it is on the downward leg of a wall GFI. Never had a problem with the GFI tripping until I replaced the vent. Now, about every third or fourth time the switch to the vent is turned OFF, the GFI trips. Wiring is fine, it's a new 20 amp circuit I put in a year ago. Terminations are well insulated. Could it be something with the new motor? It's just a vent, no light but the bathroom wall lights are also on the same GFI.

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Last edited by Mike in Arkansas; 11-16-2011 at 09:42 AM.
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Old 11-16-2011, 09:43 AM   #2
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new bathroom vent trips GFI when switch is turned off.


No one know why a switch being turned off would cause a GFI to trip?

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Old 11-16-2011, 10:18 AM   #3
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new bathroom vent trips GFI when switch is turned off.


If I were to venture a guess, it would be that the motor is generating enough current to trip the GFCI through inductance after power is removed. The reason it doesn't happen every time is that it's not generating much current and sometimes it's enough to activate the interrupt and sometimes it is not.
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Old 11-16-2011, 10:43 AM   #4
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new bathroom vent trips GFI when switch is turned off.


There is a reason we don't put bathroom fans or lights on gfci protected circuits. If it is possible to refeed the fan I would.
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