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I have properly connected the new ceiling lamp. Once I turn the breaker on again, the lamp turns on immediately. There is a double switch on the wall. One used to turn on a standing lamp on the corner and the other one was used to turn on the ceiling fan with a light I had there before but now the switch for the fan/light seems not to work to turn the light on or off: the light remains on at all times.

What is wrong and how do I fix it?

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Please describe how you wired both the switch and the ceiling lamp. At the ceiling side, were there 4 wires coming in (red, black, white, copper)? What do you see at the switch side? What are the wires connected to? Photos are best, but a description or illustration is also good. –  Jeremy W. Sherman Sep 23 '12 at 15:35
    
Also, please add a location to your user profile, at least your country. The wire colors I described are for the US; if you're in the UK or Europe, for example, things are a bit different. –  Jeremy W. Sherman Sep 23 '12 at 15:36
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1 Answer

If everything else is hooked up correctly, then you have a bad switch. This is easy to diagnose if you have a meter that measures continuity. Most digital multimeters have this option. Kill the power to this circuit at the panel before testing for this or performing any work on this circuit. The connection between the two screws of the switch will be open in the "off" position, and will be closed in the "on" positions. If the meter reads "closed" in either position then you have a bad switch. If you don't have a multimeter, just put a new switch in and see if that fixes it. The other possibility is incorrect wiring. If you replaced a fan/light combo then you probably had 3-wire going from the switch box to the device box (black, red, and white wires). When you wire the new light fixture, select one wire and cap it on both ends so you won't use it by accident (I usually cap off the red one, we usually use black in residential applications for the hot wire). This will only leave you with a black and white going to the lamp. After that, it's a simple act of wiring the black to one screw of the switch and putting your whites under a wire-nut in the switch box. The black from the panel goes on the other screw. Don't forget to bond your grounds to the boxes if they're metal.

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