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We have a ceiling fan that includes a light fixture. One day the light went off several minutes after turning it on. I checked the panel, and found that the breakers were ok. Room receptacles from the same breaker are ok too. After shaking the fan wire in the attic, it started working again, but after a couple of hours the same thing happened. I took the fan out and searched for a loose connection, but didn't find one. I traced the wire to a box, where there are four wires coming in. I checked all the wires but no power. Funny thing is the breaker is not tripping.

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Do you have different switches on the wall for the fan and the light? When you say you searched for a loose connection, how did you do so? A loose connection can be really hard to spot if it's inside a wire nut (the plastic cap/screw thing). I'd strongly suspect the line from the switch to the light is loose inside that wire nut. –  overslacked Jul 4 '13 at 4:15
I suspect the same thing. Loose wire in a wire nut. Often times the wires from the house are solid copper whilst the wires at the fixture are stranded. If the proper sized wire nut was not used the solid to stranded wire junction can be intermittent. –  Michael Karas Jul 4 '13 at 9:11
I concur that it's likely a loose connection somewhere. I'd also verify that there are no improper connections between aluminum and copper wire. –  Pigrew Jul 9 '13 at 18:38

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