A single room usually loses electricity because a breaker has tripped, a GFCI outlet has cut power to that area or a wiring connection serving the room has failed. Because rooms often share circuits in different ways, the cause is not always where the problem appears.
Some causes are simple to check safely. Others need an electrician to find.
Tripped Breakers and GFCI Outlets
Most rooms are served by one or more circuits, each controlled by a breaker in the panel. If a breaker trips, everything on that circuit loses power. If it is safe to reach your panel, look for a breaker that is off or sitting in a middle position.
GFCI outlets can also cut power to a room. A GFCI in a nearby bathroom, kitchen, garage or outdoor area may protect outlets in other spaces, especially in older homes. Pressing its reset button may restore power.
If a breaker or GFCI trips again right after you reset it, leave it off. Repeated tripping can point to a fault that needs to be found.
Loose or Failed Connections
If nothing has tripped, a loose or failed connection may be the cause. Outlets and lights on a circuit are often connected in a chain. If a connection fails at one outlet, switch or junction box, everything after that point can lose power.
The failed connection is not always in the dead room. It may be in a hallway outlet, a nearby room or a switch box that shares the circuit.
Loose connections can create heat and arcing, so they should be repaired even if the room only loses power now and then.
Damaged Wiring and Other Causes
Wiring can be damaged by nails or screws driven into walls, pests, water leaks or past renovations. Damaged wiring can interrupt power and may also create a short circuit.
A failing breaker can also cut power without appearing tripped. And in some cases, a room is simply controlled by a wall switch that someone turned off, especially if a switch operates outlets.
When to Call an Electrician
Call an electrician if resetting breakers and GFCI outlets does not restore power, if anything trips repeatedly or if you notice warm outlets, burning smells, buzzing or scorch marks.
Do not remove outlet covers, open switch boxes or open the panel to look for the problem. Parts can stay energized even when they seem dead.
Avoid running extension cords from other rooms as a long-term fix. Cords can overheat and create tripping hazards.
An electrician can trace the circuit, test outlets and connections and find exactly where power stops. Our partial power outage repair page explains how room-level outages are diagnosed and fixed. If a room in your home has lost power, contact us to describe what you have checked so far.