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Old 02-27-2013, 06:52 PM   #1
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Light doesn't come on, but then turns on when I tap on the bulb?


I have a really annoying problem with a few of my light fixtures. When I turn the switch on, there is one bulb that doesn't come on.

However, if I give the bulb a tap, then it turns on and stays on. Or, if I don't tap it, after a while it will come on.

Any idea what this could be?

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Old 02-27-2013, 07:12 PM   #2
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Light doesn't come on, but then turns on when I tap on the bulb?


I assume you are talking about florescent fixtures.

Verify the fixture is grounded.

Ballasts are going bad.

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Old 02-27-2013, 07:33 PM   #3
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Light doesn't come on, but then turns on when I tap on the bulb?


Sorry, I should have been more specific. These are CFL bulbs, but they are standard household fixtures (sorry, don't know the technical term - One is the light on a ceiling fan, and the other is a light over a bathroom mirror.
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Old 02-27-2013, 07:58 PM   #4
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Light doesn't come on, but then turns on when I tap on the bulb?


Bad CFL lamp

Poor connection in the lamp socket. Turn the power off (at the circuit breaker) and clean the center contact in the lamp socket.
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Old 02-27-2013, 08:52 PM   #5
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Light doesn't come on, but then turns on when I tap on the bulb?


sometimes the center tab gets bent and doesn't make good contact with the bulb. Try bending it up slightly. *With the power off!* and see if it clears up the problem. If it does not, you may want to check the socket inside the light fixture and make sure the wires are tight under the screw terminals of the socket
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Old 02-27-2013, 09:00 PM   #6
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Light doesn't come on, but then turns on when I tap on the bulb?


Thanks all! I'll check the contacts and try bending the tab.

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