No power to outlet breaker not tripped: what to check

Why a GFCI in the garage kills an outlet in the bedroom

Household outlets are not individually fed from the panel. They are daisy-chained: one cable runs from the breaker to the first device, another from that device to the second, and so on down the run.

A GFCI receptacle has line terminals for the incoming supply and load terminals for the rest of the chain. When it trips, everything connected to those load terminals loses power, and none of those downstream outlets has any indication of why.

Physical distance is irrelevant to that. A circuit can start in the garage, pass through a basement, and finish in a bedroom on the floor above, which is exactly why the hunt has to cover the whole house rather than the affected room.

The room-by-room GFCI hunt

Search in the order these devices are normally installed, because that is roughly the order of likelihood.

• Bathrooms. Almost always GFCI-protected, often the first device on a circuit that continues elsewhere.
• Kitchen counters. Every counter receptacle is required to be protected, and one device frequently covers several.
• Garage and basement. The classic hiding place. Check behind shelving, boxes and the freezer.
• Laundry and utility areas. Including any receptacle serving a washing machine or sink.
• Outdoors. Under a weatherproof cover, often at the back of the house or beside a hose bib.

Look for the two small buttons. On a tripped device the reset button usually sits slightly proud, though not always visibly so, which is why the useful test is pressing it rather than looking at it.

Switched receptacles and the lamp problem

The second most common benign cause is a socket that was always meant to be switched.

In many American living rooms and bedrooms, half of one receptacle is wired to a wall switch so a floor lamp can be controlled from the door. If somebody turned that switch off months ago, the socket has simply been dead ever since and nobody connected the two events.

Work every switch in the room, including the ones that appear to do nothing, and watch the socket while you do it. It costs a minute and it resolves a surprising share of these cases.

When a GFCI will not reset

The three are distinguishable. No click and no response at all suggests no incoming power. A click followed by an immediate pop-out is a live ground fault. A device that resets and then trips minutes later under load points at moisture or a failing appliance downstream.

GFCIs have a service life, and one installed twenty years ago may simply be finished. Replacing it is licensed work in most states and it is a short job.

Half the house has no power

This is a genuinely different fault that shares the same search, and it deserves its own answer.

US homes are fed by two 120-volt legs. If one is lost, roughly half the breakers in the panel go dead while the other half work perfectly, and nothing appears tripped because nothing has tripped.

The loss can be at the main panel, at the meter, or on the utility side of it, and that last case is common after storms. Call your power company as well as an electrician, because if the fault is on their side it is neither your bill nor your problem.

Lights brightening in some rooms while dimming in others points at the same underlying cause, which our page on flickering lights covers.

The loose backstab, and why it fails

When the GFCI hunt and the switch hunt both come up empty, the remaining cause is usually a connection that has failed open somewhere in the chain.

Cheaper receptacles allow the installer to push a conductor into a hole in the back of the device rather than wrapping it under a screw terminal. Those push-in backstab connections rely on a small internal spring, and decades of heating and cooling relax it.

The practical clue is sequence. The last outlet that still works, and the first one that does not, bracket the failure, and the fault is usually in the device at the boundary.