GFCI Keeps Tripping When It Rains

Quick answer

A GFCI outlet tripping during rain is usually caused by water intrusion or a ground fault. Turn off the power, check for moisture, and inspect connected devices for leaks or damage.

Confirm the symptom

• GFCI outlet trips only when it rains
• Outlet resets but trips again quickly after rain
• No other outlets are tripping
• No visible water on the outlet itself

Tools and prep

• Non-contact voltage tester
• Multimeter
• Silicone waterproof cover
• Cable stripper
• Wire nuts
• Screwdriver set
• Damp proofing sealant

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Prep & safety

• Turn off the power at the circuit breaker before starting any work
• Ensure the area is dry and well-ventilated
• Wear rubber-soled shoes and insulated gloves for safety

Step-by-step troubleshooting

1. Turn off power
   Do: Switch off the circuit breaker that controls the GFCI outlet.
   Observe: The outlet should no longer have power.
   Means: Safe to proceed with inspection.
   Next: Check for visible water damage
2. Check for visible water damage
   Do: Inspect the outlet and surrounding area for signs of water intrusion.
   Observe: Look for water, mold, or corrosion.
   Means: Water may be causing the ground fault.
   Next: Dry the area thoroughly
3. Dry the area thoroughly
   Do: Use a clean, dry cloth or fan to remove any moisture.
   Observe: The outlet and wiring are dry.
   Means: Moisture was likely the issue.
   Next: Test the outlet
4. Test the outlet
   Do: Press the 'Test' button on the GFCI outlet, then press 'Reset'.
   Observe: The outlet stays reset and works normally.
   Means: The issue may be resolved temporarily.
   Next: Inspect connected devices
5. Inspect connected devices
   Do: Check all devices plugged into the GFCI circuit for water damage or leaks.
   Observe: Any device with water or damage is the likely culprit.
   Means: A faulty device is causing the ground fault.
   Next: Replace or repair damaged devices
6. Check wiring connections
   Do: Open the outlet box and inspect the wiring for loose or corroded connections.
   Observe: Wires are secure and dry.
   Means: Loose or wet wiring can cause tripping.
   Next: Seal the outlet box
7. Seal the outlet box
   Do: Apply a waterproof cover or sealant around the outlet box.
   Observe: The outlet is now protected from moisture.
   Means: Prevents future water intrusion.
   Next: Monitor for recurrence

Common causes

Parts you might need

When replacing parts, ensure they match the specifications of your electrical system.

• GFCI outlet: match voltage and amperage rating of the existing outlet
• Waterproof cover: ensure it fits the outlet box size and is rated for outdoor use
• Wire nuts: match wire gauge and number of wires being connected
• Sealant: use a waterproof electrical box sealant compatible with your outlet box material
• Multimeter: ensure it has the correct voltage and resistance measurement range for your system

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Check the label on the existing GFCI outlet for its specifications before purchasing a replacement.

When to call a professional

• The GFCI continues to trip after all troubleshooting steps
• You find extensive water damage or electrical hazards
• You are unsure about electrical work or safety
• The wiring is old, damaged, or not up to code
• You suspect rodent or pest damage that requires professional inspection

FAQ