GFCI Circuit Breaker Keeps Tripping: Causes and How to Fix It
A GFCI circuit breaker trips when it detects current leaking outside the normal circuit path — even as little as 5 milliamps. That sensitivity is what protects you from electrocution, but it also means a GFCI breaker
can trip from things that aren't dangerous. Here's how to figure out what's causing yours to keep tripping.
Why GFCI breakers trip more than standard breakers
A standard breaker trips only when the current exceeds its rated amperage. A GFCI breaker measures the difference between current flowing out on the hot wire and current returning on the neutral wire. Any imbalance
above 5mA causes a trip — regardless of whether the total current is anywhere near the breaker's amp rating.
This means a GFCI can trip from:
- An actual ground fault (the hazard it's designed to catch)
- Moisture on wiring or in a device
- A specific appliance with a small current leak
- A wiring issue in the circuit
- A failing GFCI breaker itself
Cause 1: Moisture in the circuit
The most common reason a GFCI breaker trips repeatedly, especially in garages, bathrooms, outdoor circuits, and basements. Water on a wire or inside a device creates a path for current to leak to ground — exactly what
the GFCI is looking for.
How to identify it:
- Trips happen more often after rain, high humidity, or after using water nearby
- Outdoor outlets, garage outlets, or bathroom outlets on the circuit
- Any recently installed fixture or outdoor outlet where moisture could have entered during installation
Fix: Let the area dry out completely. Check outdoor outlets and junction boxes for signs of water intrusion. Replace any outlet or fixture cover that isn't properly sealed. If you suspect water got into wiring inside a
wall, have an electrician inspect it.
Cause 2: A specific appliance with current leakage
Many appliances have a small amount of current leakage — typically below 1mA — that's within normal tolerances. But some appliances, especially older or failing ones, leak more. When multiple appliances with small
leakage are on the same GFCI circuit, their combined leakage can exceed the 5mA trip threshold.
Common culprits:
- Older refrigerators — motors and compressors develop leakage over time
- Space heaters — especially if the element or insulation has degraded
- Window AC units — especially in humid conditions
- Old power tools — motor insulation wears and develops leakage
- Certain types of lighting (neon signs, some ballasts)
How to find it: Unplug everything from the circuit. Reset the GFCI breaker. Plug devices back in one at a time, waiting a minute or two after each. When the breaker trips again, the last device you plugged in is the
source.
Fix: Replace the leaking appliance. It may not be causing immediate harm, but deteriorating insulation will only get worse.
Cause 3: A wiring fault in the circuit
If the GFCI trips with everything unplugged, the fault is in the wiring itself, not in a device.
Possible wiring issues:
- Hot and neutral wires reversed at an outlet
- Neutral wire from a different circuit accidentally shared on this GFCI circuit (called a "shared neutral" — incompatible with GFCI breakers)
- Damaged insulation on a wire inside a wall
- A wire nicked by a nail or screw during construction or renovation
The shared neutral problem: GFCI breakers require that the neutral wire is dedicated to only that circuit. If two circuits share a neutral — common in older homes — the GFCI will see unequal currents and trip
continuously. This requires re-wiring to give each circuit its own dedicated neutral.
If you suspect a wiring fault, call an electrician.
Cause 4: The GFCI breaker itself has failed
GFCI breakers contain electronic components that can fail over time — typically after 10–15 years. A failed GFCI breaker may trip on reset with nothing on the circuit, trip at random intervals, or fail to reset at all.
How to test: Turn off the breaker and disconnect the load wire (white neutral) from the breaker's neutral lug. Reset the breaker. If it now holds without the circuit connected, the fault is in the circuit wiring. If it
still trips with no circuit connected, the breaker has failed.
A failed GFCI breaker needs to be replaced with the same brand and amperage. Browse GFCI circuit breakers (/collections/gfci-ground-fault) — we stock direct-fit GFCI breakers for Siemens, Eaton, Square D, and ABB
panels.
FAQ
Why does my GFCI breaker trip when it rains?
Rain drives moisture into outdoor outlets, weatherproof covers that aren't properly sealed, and buried conduit. Even a small amount of moisture on wire insulation increases ground leakage past the GFCI's 5mA threshold.
Check all outdoor outlet covers, conduit entry points, and junction boxes on the circuit for moisture intrusion.
Can too many devices on a GFCI circuit cause it to trip?
Yes — if those devices have small individual leakage currents that add up past 5mA. This is more common with older appliances. Each device may be within acceptable tolerance on its own, but several devices each leaking
1–2mA can combine to exceed the trip threshold.
My GFCI breaker won't reset — what do I do?
Push the RESET button on the face of the breaker first, then move the lever to ON. If it still won't reset, move the lever to OFF before pressing RESET, then back to ON. If it trips immediately on reset or won't latch
at all, there's either an active ground fault on the circuit or the breaker has failed. See our guide on why your circuit breaker won't reset (/blogs/news/circuit-breaker-wont-reset) for a full diagnostic.
Photo of "Eaton, BR, BR220, 20A, Circuit Breaker"
Is it safe to replace a GFCI breaker with a standard breaker?
Only if the circuit doesn't require GFCI protection — which in most cases it does. Bathrooms, kitchens, garages, and outdoor circuits are all required by the NEC to have GFCI protection. Replacing a GFCI with a
standard breaker removes that protection. Fix the root cause instead.