EZSMART Corporation, ESA/ECRA #7012690 , North York , Ontario
Mon-Fri 08:00 AM - 05:00 PM
You changed the bulb, tested it in another lamp, and it works fine — but the fixture still will not turn on. When a light fixture stops working but the bulb is good, the problem is almost always one of five things, and most of them can be diagnosed in about five minutes without opening a wall.
Work in this order every time: confirm the breaker has not tripped, test the wall switch, inspect the socket contact tab inside the fixture, check the wire nut connections, then rule out the fixture itself. Nine dead fixtures out of ten stop here without a service call.
Test the bulb in a fixture you know works. Confirm the wattage matches what the fixture is rated for — an over-wattage bulb can damage the socket. Then check your breaker panel. A partially tripped breaker sometimes looks like it is on but sits between ON and OFF; push it fully off, then fully on.
Wall switches fail more often than fixtures. If you have a multimeter, test for continuity across the switch terminals with power off. No multimeter? Swap it for a $3 spare and see if the light comes back. If the fixture is on a three-way circuit with two switches, both switches interact — test each one.
Turn off the breaker before touching the fixture. Look inside the empty socket — you will see a small brass tongue at the bottom. That is the contact tab, and it gets flattened over years of tightening bulbs. Use a wooden stir stick (never metal) to bend it up about 3 mm. This single fix accounts for the majority of “dead fixture, good bulb” complaints we see. If your bulbs also burn out unusually fast, a bad tab is a likely reason.
With the breaker still off, unscrew the fixture from the ceiling and pull it down carefully. Look at the wire nuts joining the fixture leads to the house wiring — they should be tight, with no bare copper showing and no scorching. Twist them clockwise to tighten; replace any that feel loose. Melted wire nuts or blackened wires mean stop, restore the cover, and call an electrician.
If the socket tab is fine, the wiring is clean, and the switch tests good but the light still will not work, the fixture itself has failed. LED fixtures with integrated drivers, fluorescent ballasts, and older sockets all have finite lifespans. The Ontario Electrical Safety Authority notes that most homeowner electrical injuries happen while working on live circuits — always cut power at the breaker before removing a fixture, and browse lighting service options if you are unsure.
Before you buy a new fixture, tap the base of the bulb gently after installing it. If you get a flicker, the socket tab is the problem — you just did not bend it up quite enough. That $0 fix has saved GTA homeowners hundreds of unnecessary fixture replacements. If the fixture is on a switched circuit that controls other lights too and all of them are dead, the problem is upstream at the switch or breaker, not the fixture.
Stuck on a dead light fixture or not comfortable working on live wiring? Call us at 416-838-9006 or visit our contact page — we will be happy to help.
