Short answer
If a light switch stops working, start with the bulb: switch it off, let it cool and try a bulb you know works. If the light has two switches, flip the other one too. Then check the panel for a tripped breaker and reset it once, from a dry floor. If the switch feels warm, crackles, sparks or flops loosely, turn off the breaker and call an electrician.
Safety first
A warm, buzzing or crackling switch is a fire risk. Switch off its breaker and do not use it. Do not take off the cover plate. If you smell burning or see smoke, get out and call 911.
How to check a light switch that does nothing
1Flip it and nothing happens
Before you blame the switch, rule out the easy things: the bulb, the other switch for the same light and the breaker.
Read all the steps
- Flip it and nothing happens. Before you blame the switch, rule out the easy things: the bulb, the other switch for the same light and the breaker.
- Try a bulb you know works. Switch it off and let the old bulb cool. Then put in a new one and switch it back on. A burned-out bulb is the most common cause.
- Two switches for one light? Flip both. Stairs and long halls often have a switch at each end. The light depends on both, so flip the other one too.
- Reset the tripped breaker once. Standing on a dry floor, push the breaker sitting in the middle fully Off, then On. If it trips again, leave it off.
- Warm, crackling or loose? Call. If the switch feels warm, crackles, sparks or flops loosely, switch off its breaker. Do not open the cover: call an electrician.
- Still not fixed? Call an electrician Especially if: the switch feels warm, buzzes, crackles or sparks.
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Why switches stop working
- A burned-out bulb, or a bulb that is loose in its socket.
- A tripped breaker or, in bathrooms and garages, a tripped GFCI outlet on the same circuit.
- A worn switch: it feels mushy or flops with no click.
- A loose wire behind the switch. This is the one that heats up.
Smart switches, timers and sensors
Smart switches and timers can lose their settings after a power outage. Check the app or the switch itself and set it again. Motion sensors may be set to keep the light off during the day. If it still does nothing, call an electrician.
When to call an electrician
- The switch feels warm, buzzes, crackles or sparks.
- A new bulb and a reset breaker did not fix it.
- The switch is loose in the wall or flops with no click.
- Several switches or lights stopped working at once.
Frequently asked questions
Why did my light switch suddenly stop working?
Most often the bulb burned out or a breaker tripped. If a new bulb and a reset breaker do not help, the switch is worn or a wire is loose: call an electrician.
Can a light switch go bad?
Yes. Switches wear out with use. Signs are a mushy feel, no click, a light that flickers when you touch the switch, or a switch that is warm. Have an electrician replace it.
Is a warm light switch dangerous?
A regular switch should not feel warm. Dimmers can get slightly warm, but a warm regular switch can mean a loose connection: switch off the breaker and call an electrician.
Why does my light only work from one of two switches?
On a three-way setup, the light depends on the position of both switches. If one switch never works, it may be worn or wired wrong. Call an electrician.
Why does my light switch spark when I flip it?
A tiny flash inside can happen. A spark you can see around the edges, a crackle or a burning smell means a worn switch or a loose wire. Switch off the breaker and call an electrician.
Can I replace a light switch myself?
It means working on the wires behind the cover, so if you are not trained, have an electrician do it. They also find out why it failed.