What homeowners usually notice
- A recessed light goes out after a while and comes back on after cooling
- Lights shut off at the same time every day or night
- A light goes off when someone walks upstairs or closes a door
- Lights cut out and return when you jiggle or tap the switch
What to do right now
- Note how long the light stays on before it shuts off and how long it stays off
- Check whether the fixture has a timer, motion sensor or smart switch and look at its settings or app
- Look at the bulb wattage in any recessed can that cycles off
- If a switch is warm, crackles or smells hot, turn the circuit off at the breaker
Likely causes
Thermal protection in recessed cans
Most recessed cans have a built-in sensor that cuts power when the housing gets too hot. An oversized bulb, insulation packed against a can not rated for it, or a hot attic can trip it repeatedly.
Smart switches, timers and sensors
Schedules, away modes, vacancy sensors and automations can turn lights off. A smart switch can also reset its schedule after a power blip.
Loose connection
A loose wire at a switch, fixture or splice loses contact when it heats, shifts or vibrates. Lights that go off with a bump or a door slam often have a loose connection somewhere.
Failing switch
Switches wear out. A worn switch can lose contact internally and let a light drop out even when the lever has not moved.
Circuit-level interruption
If a whole group of lights blinks off together, the problem may be at a shared splice, a failing breaker or a connection in the panel.
Safe checks you can make
- Feel the switch plate for warmth without removing it
- Look for a timer, sensor or schedule in a smart home app
- Check whether one light or many go off together
- Notice whether vibration, like a door closing, sets it off
Leave outlet covers, switch plates and the panel cover in place. Noting what you see and hear is enough; testing inside boxes belongs to an electrician.
Is this something you can fix yourself?
Some of these have simple answers. If a recessed can cycles off and on, try a lower wattage LED bulb rated for recessed use; if the light then stays on, the can was overheating and you have likely solved it. For smart switches, sensors and timers, check the schedules, vacancy settings and automations in the app or on the device itself, and update the time after a power outage. What you should not do is remove trim to disable a thermal protector or open the switch box. If the right bulb and correct settings do not fix it, or the light drops out with vibration, the cause is probably a connection that an electrician needs to find.
When professional help is the right call
- The light goes out when doors close or people walk upstairs
- A warm, buzzing or crackling switch
- Several lights blink off together
- A recessed can that keeps cycling even with a low wattage LED
- Discoloration on a switch plate or around a fixture
Safety first. A light that goes out along with a crackle, a burnt smell or a warm switch plate should be turned off at the breaker and left off until someone checks it. Call right away if lights across the house go on and off together. If you see smoke, flame or sparking that continues, get out and call 911.
What an electrician typically checks
An electrician will check whether the recessed can is rated for contact with insulation, look at the bulb and trim, and inspect attic clearance where it can be reached. For switches, they check the device and its connections and work through fixture and junction boxes to find loose splices.
Common fixes include replacing old cans with IC-rated housings or LED retrofit trims, replacing worn switches, and remaking loose connections. For smart devices, they will confirm the switch has a neutral if it needs one. Recessed lighting upgrades and electrical troubleshooting are the usual services involved.
Keeping it from coming back
Use recessed-rated LED bulbs at or below the can's labeled wattage, and keep attic insulation off cans that are not IC-rated. Write down smart switch and timer schedules so everyone in the home knows what they do, and if a new LED also flickers, the LED flicker guide may help. In older Homewood and Crestwood houses with recessed lights added later, it is worth having the attic clearance checked.