GFCI Outlet Trips with Lights or Fan Switch

Discussion in 'Electrical Forum discussion & Blog' started by jdf405, Jun 23, 2009.

  1. jdf405

    jdf405 Electrical Engineer

    Jan 22, 2008
    Electrical Engineer
    Los Angeles Area
    My bathroom was remodeled about a year ago, with a new 20A line pulled from the panel. The lights and fan are on the line before the GFCI outlet. We leave a rechargable tooth brush plugged into the GFCI all the time, but nothing else.

    Recently when we turn off the lights or the bath vent fan the outlet trips (GFCI, not the 20A breaker). It resets right away easily. All of the wiring was per code, inspected, etc... and I've tested the resistance from hot & neutral to ground with an Ohm meter and its above 1 MOhm (the highest my DVM can read).

    Any ideas on why this happens? Possibly a defective outlet?

    Thanks for the help,
  2. 1960 rancher

    1960 rancher New Member

    Mar 2, 2009
    priming pump
    Your stating that the outlet trips when shutting off the light or fan? Seems odd but it could put a surge on the neutral causing the outlet to trip. I would replace the outlet and or confirm there is not a short between the neutral and ground. Not sure what the threshold is for a trip but it could be around 1mega ohm.... If your meter does not go to OL (everload or open) then that could be your problem. Is the tooth brush unplugged when taking this reading?
    Last edited: Jun 23, 2009
  3. Sponsor

    Sponsor Paid Advertisement

Similar Threads: GFCI Outlet
Forum Title Date
Electrical Forum discussion & Blog Circular Saw tripping GFCI outlets Jun 1, 2017
Electrical Forum discussion & Blog GFCI replaced, now regular outlet is dead Feb 14, 2016
Electrical Forum discussion & Blog Bathroom outlets tripping garage GFCI Nov 15, 2015
Electrical Forum discussion & Blog Do GFCI Outlets Need a Ground? Nov 14, 2014
Electrical Forum discussion & Blog Is this box too small for this GFCI outlet? Dec 15, 2011

Share This Page