How to Troubleshoot a Tripped GFCI That Won’t Reset

A GFCI receptacle that trips and will not reset — or< that resets briefly and trips again immediately is one of the most common electrical service calls in Ontario homes. The behaviour is often misread as a faulty GFCI device, but in most cases the GFCI is doing exactly what it is designed to do: detecting a ground fault or a wiring error and cutting power to prevent a shock hazard.

How to Troubleshoot a Tripped GFCI That Won’t Reset

Step 1: Unplug Everything and Attempt a Reset

Unplug all devices from the GFCI face and from any downstream outlets it protects. Press the reset button firmly. If it latches, plug appliances back in one at a time to identify which one triggered the trip. In about 60% of service calls, the fault is in an appliance, not the wiring.

Step 2: Check for Moisture at Outdoor or Wet-Area Outlets

If any GFCI-protected outlets are outdoors, in the garage, or in a wet area, inspect each for water intrusion or condensation. Allow the box to dry completely, then attempt reset. Replace damaged weatherproof covers.

Step 3: Check for Line/Load Terminal Reversal

A GFCI wired with line and load connections reversed will not function correctly. The LINE terminals must receive the incoming hot (black) and neutral (white) conductors from the panel side. If reversed, swap the connections with the breaker off.

Step 4: Test the GFCI Device

• If the reset button latches but the test button does not trip the device: GFCI has failed internally. Replace it.
• GFCI outlet tester (a plug-in tester from a hardware store): press the tester’s test button – if no trip, GFCI has failed.
• GFCI receptacles have a limited service life (typically 10-15 years). Older units that repeatedly trip without a clear cause need replacement.

If the Fault Is in the Fixed Wiring

If the GFCI resets with downstream outlets disconnected but trips when reconnected, the fault is in the downstream circuit wiring or a failed outlet. Identifying a fault in fixed wiring involves handling energized wiring and requires an ESA-licensed electrician.

Contact Us

GFCI issue not resolved with these steps? Our ESA-licensed electricians diagnose and correct GFCI wiring faults correctly the first time. Call us at 416-838-9006 or visit our contact page.

Amir Azimipour

Electrician Since 2008 Journeyman Electrician Designated Master Electrician at EZSMART Corp