Question about Rotary Pass & Seymour / Legrand 90603 600W Incandescent 3-Way Preset On/Off

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Dimmer switch not working

Will switch on or off but will not dim. replaced switch, wired same as the one i replaced. just one black and one red wire . but the new switch just does the same as the one i took off

any ideas please Malcolm


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  • Contributor
  • 32 Answers

Are you using a compact florescent bulb? Most of them cannot be dimmed.

Posted on Dec 30, 2008

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mkh5094
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SOURCE: 3 way dimmer turns on and off, but does not dim

All your wiring looks good. Many times dimmer just have problems and are faulty. You should note that the dimmer can only handle 600 watts. If you have that or more on it, than you have probably fried the dimming mechanism. In either case the dimming mechanism is not working properly and you will have to take it back and get the same dimmer or a different one. Tell the store they sold you a faulty dimmer and you can get a replacement at no cost.

Posted on May 29, 2010

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Posted on Jan 02, 2017

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1 Answer

Leviton IPI06-1LM 3 way dimmer switch- not dimming


Hi Sara,

Please read this entirely before attempting.

I am an electrician and would like to help you with this problem. You have provided great detail of your situation, yet I am confused about the statement describing how you wired it:

"-Red Wire (used in 3-way installation-tagged) from switch to the red wire in wall."

Before checking wiring, be sure to shut off the power to the circuit.

The "tagged" wire should be the one you identified with tape (when you removed the original) that was connected to the dark colored (called a "shunt" or "common terminal") screw of the switch.

In a 3 way installation, both red wires from the dimmer switch are used. In a single pole installation, only the UNinsulated red wire is used and the insulated wire is not.

To which wire do you affix the "tag"? If it was a short wire that ran between the the bundled black wires and the shunt terminal screw of the old switch, then the dimmer switch's black wire should be combined with these bundled black wires. One of the dimmer switch's red wires would be connected to the red wire in the box and the dimmer switch's last red wire would be connected to the remaining black wire in the box. I understand that this is the way you have it currently wired - but without being able to dim.

If this is all correct, did you check / change the Minimum Brightness Adjustment setting for the switch as detailed in Step 7 of the directions?

"This Dimmer incorporates a
minimum brightness adjustment
that allows you to set the level of
light when the slider control lever is
in the lowest position.
Move slider to the lowest position.
Using a small, insulated screwdriver,
rotate the adjustment screw as
shown until the desired level of
minimum brightness is obtained."

I hope this helps and good luck!

Dec 31, 2012 | Electrical Supplies

1 Answer

Two black wires come to original switch. I have wired the dimmer turning the wires around and the switch will not work. What did I do wrong?


If the picture is accurate, I have had the same misfortune with this model. Two wires the same color means its not pole sensitive and can be wired either way. Replace it with a more expensive switch and you should be OK.

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I would like to install a Lutron 3 way dimmer switch. The switch has a red, black, green, and white/red striped wires. The previous switch has 2 red and 2 black wires connected to it. The other 2 light...


The circuit you are working on is a 3-location circuit - where two of the devices were 3-way switches, and the remaining device (the one you are trying to replace with a dimmer) is a 4-way switch. Standard dimmers like the one you're using CAN NOT be used to replace a 4-way location. If you wanted to use it to replace either of the 3-way switches, that's no problem - but what you're doing right now will not work.

If you absolutely want to dim the lights from that specific electrical box, my suggestion is to upgrade to a "smart dimmer" where instead of a basic dimmer and two light switches, you have three devices that talk to one another and all dim the lights together.

In terms of your ground wire questions - ground wires certainly aren't necessary to make the whole thing work - rather they're there for safety. Sometimes installers will ground the device by connecting the ground wire to the backbox (assuming its metal) and then rely on the mounting screws on the dimmer or switch to perform the grounding. There are some code rules/exceptions for allowing the device to not be grounded (usually when its in a plastic, non-combustible backbox). If you want to make sure everything is completely up to code (which are usually goverened by local municipalities), you should consult a licensed electrician - but above all else, just use good judgement. Long story short, if the devices weren't grounded before, you can't make it any worse.

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Ok you've had some jack leg electrical work done in your house. The (white bypass) nuetral should be left alone, first you have to figure out which wire is your hot wire (the one bringing the power to the switch) you will need a meter. Take the wires off one screw at a time (you may want to turn off the breaker feeding the switch, its not a bad idea) chack the wires one at a time until you find the hot wire, once you've figured that out tie those wires togrether with the black wire on the dimmer, take the other set and tie those together with the red on the dimmer but with that many wires you're dimming more than one light at a time. If you have anymore questions just let me know

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I am replacing an on-off switch, with the 90610-wv dimmer. The instructions says there should be 2 black wires, and possibly a green. The wire in the existing switch has 1 white 1 black, and a bare copper...


The important thing to remember is your switch has two wires.
Sometimes the colors vary a bit because of the specific circuit.
The green wire, when present, is a ground wire, and always connects to bare copper wire.

If your dimmer has two black wires, then connect dimmer-wires to either switch-wire
If the dimmer does not work, simply reverse the two wires.

If your dimmer has a red and black wire, then connect dimmer-black to switch-black, and dimmer-red to switch-white.
Again, if dimmer does not work, reverse the two wires.

Answer back if you have trouble, and I will help.

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1 Answer

Need to hook this up to a lutron eco-t528-277-2 ballast which only has a hot,dimmed hot and neutral


If I understand correctly, you have Leviton florescent dimmer

And you want to connect dimmer to Lutron ECO-series ballast

This is the ballast with 3 wires: Hot dimmed, Neutral and Hot
02b5a79.jpg

Is this your dimmer???? Has Black, White, Red, Yellow-red, & Orange

3103a3a.jpg


Here's how to do it:
Dimmer yellow-red is not used except for 3-way switch >> cap it off with wire nut
Dimmer orange wire connects to ballast Dimmed Hot
Dimmer red wire connects to ballast Hot
Dimmer white wire connects to ballast Neutral

Those are your wires going to ballast. As you can see, you need 3 wires going to florescent fixture

Next, let's focus on Dimmer:
Dimmer green wire goes to bare ground wire
Dimmer black wire connects to Hot from breaker box (we'll test for that next)
Finally the Dimmer white wire connects to ballast Neutral as discussed above BUT is also has to connect to Neutral from breaker box

This means the Dimmer white wire is connected to 2 wires >> one wire goes to florescent fixture and the other wire comes from breaker box


So which wires come from breaker box??
It should be a black and white wire.
Let's test to find Hot and Neutral that come from breaker box.

Mark your wires.
Disconnect all the wires and separate from each other
Turn on power
Use ordinary tester
Tape tester leads to wood sticks so hands stay away from electricity
Power is on
Test each wire to bare copper wire
When tester lights up, that is Hot from breaker box ... this wire connects to Dimmer black wire
Now, test the hot wire to each of the other wires
When tester lights up, that is Neutral wire ... this wire connects to Dimmer white wire, and also connects to Ballast neutral.

Connect one wire at a time, and it will work.

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1 Answer

3 way dimmer turns on and off, but does not dim


All your wiring looks good. Many times dimmer just have problems and are faulty. You should note that the dimmer can only handle 600 watts. If you have that or more on it, than you have probably fried the dimming mechanism. In either case the dimming mechanism is not working properly and you will have to take it back and get the same dimmer or a different one. Tell the store they sold you a faulty dimmer and you can get a replacement at no cost.

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The wall switch that I am replacing, with a 3-way dimmer switch, has 2 black wires, 2 red wires and a green wire. The new 3-way dimmer switch has 2 red wires, 1 black wire and 1 green wire. Question: How...


Ok the RED is Phase and the Black is Neutral... Green is Earth. you have an IN, Red wire, and an OUT Red wire, the rest just go color to color. So in the socket, one Red wire goes to one Red wire from the dimmer, the other Red wire in the socket, goes to the other Red from the dimmer, then Black to Black, and Green to Green. Be careful do NOT work on it live.

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If the dimmer has two leads, it is a standard dimmer. One wire brings power into the dimmer, the other lead send "dimmed" power out.
If the dimmer has three leads, it is a 3-way, which is a combination of a dimmer and a 3-way switch. One wire brings power into the dimmer, and the other two leads bring "dimmed" power out - when you cycle the on-off function (by clicking the switch) you are sending the "dimmed" power out one lead or the other. You can use a 3-way dimmer in place of a standard 2-way by simply not using one of the 2 wires coming out of the switch. BUT you must be certain to insulate the end of the lead you aren't using, because when the switch is "OFF", this unused lead will be live. If you are actually trying to wire a 3-way, here's an excellent how-to-- http://www.ehow.com/how_2280970_wire-threeway-dimmer-switch.html Please vote if you found this helpful. Thanks, Al

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