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Replace two way light switch

Hi i want to change the light switch in the hallway. it has two switches on one board. one is for downstairs and the other one is for upstairs hallway. there are two cables coming in to the same box. they each have red blue and green wire. i tried to connect looking at the old switch and only the downstair one works. on the switch there there is 3 holes at top and 3 at bottom. they are common and L1 and L2. the top had a wire which was a loop from common to L2 i think. which wires go where please

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It sounds like you have what is called a three way switch for the upstairs light. This means that the light is controlled in two locations. The extra wire you refer to as a loop is called the traveller it goes between the two locations. You need to use the proper type of switch for 3 way applications. Once you get that there will be three holes instead of 2. the traveller usually installs in the hole that is alone (usually 2 holes on the bottom and one on the top). Any 3 way switch will come with instructions, or you should be able to find diagram easily on line.

Posted on Jan 04, 2009

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I'm a licensed electrician and will be happy to help you get this working again. I suspect an incorrectly wired or incompatible switch or a load that is not designed for dimming. To know which one(s) is the problem and to be able to provide a solution, I need a little more information.

1) What was the old switch brand and model number?
2) What is the new Leviton switch's model number?
3) What type of light bulbs are you trying to operate in the 3 fixtures?
4) What is the number of and wattage of each lamp in the fixtures?
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Hi Jay,
Ive suspect that there's a problem in the main line of the wiring. Since four halogen bulb are already replaced with a new bulb and bypassed the dimmer switch concentrate now on the wiring and the main panel board. Look for a tripped/busted breaker on the box, reset it.Replaced if busted. If nothing works, you need to check the wiring on the ceiling for open.
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http://www.lutron.com/Products/StandAloneControls/Dimmers-Switches/Pages/DimmersSwitches.aspx

Lutron shows widest selection of dimmers.
The wattages you posted are standard for multiple dimmers.

Once you identify type of dimmer, add a comment and say if dimmer is single-pole or 3-way.
A 3-way dimmer would be in a hallway, where more than 1 device controls same lights.
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If I know what dimmer you have, I can search for the product and add another comment.

Or search for yourself:
For example, let's say you have 3-way Skylark dimmer.
Do a google search for 3-way skylark dimmer:
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If information above doesn't help, then take advantage of fixya phone service.
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