Leviton Rotary Dimmer only works if manually depressed and held in place by hand or tape. Any solution other than replacing? Uncertain of model #. Thank you.

Look at product number again to see if numbers posted are correct.
Also include what type of device this is: rotary dimmer? slide dimmer? touch dimmer? Switch? single-pole application or 3-way? And include what you are replacing.

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with a three way switch like this, you will have two traveller wires and a common wire. Look in the instructions for the switch or on the back of the device itself to see if there is a wire labeled "common" or "com". This common wire from the old switch hooks up to the common wire on the new switch. I did a bit of searching on the leviton 6602, but couldn't find anything specifically about the three way version (I would venture to guess, however, that the red wire on the old switch is the common). The common on one of the three way switches will always be a constant hot (or power) wire...the common on the other three way switch will be the "switch leg" or the wire that connects directly to the light. The two travellers go to the other two wires. Check the pamplet that came with the lutron device, it should show which wire is common and which are travellers.

It depends. Some dimmers are considered "smart dimmers," where the control on the other end of the 3-way has to be intelligent enough to send a signal back to the dimmer. If the Lightolier dimmer was a smart dimmer, then chances are that the 3-way control was designed to talk only to that specific dimmer. The Leviton product you replaced it with is a simple, basic dimmer - it should work in conjunction with a simple, basic 3-way switch.

If the 3-way control already IS a simple, basic 3-way switch - then I would simply re-check the wiring of the dimmer you replaced.

1) Electronics inside dimmer can go bad, and lights will not work as before.
Simply replace dimmer.
I buy new dimmers at Home Depot.

2) Lutron shows a wide variety of dimmers:
Use pictures from page to identify type of dimmer you want, and then google search: For example search for 'skylark dimmer' or 'rotary dimmer'
http://www.lutron.com/Products/StandAloneControls/Dimmers-Switches/Pages/DimmersSwitches.aspx

3) Add a comment for more free help. For example how to install new dimmer without calling electrician.
Also take advantage of fixya phone service.
For a price, fixya expert speaks with you over phone while you work on dimmer, or any do-it-yourself project.

The Leviton IP106 Illumatech dimmer switch must be installed at the switch location where the hot feed exists. From your description your hot feed is at the regular 3-way switch location. Swap locations.

You posted under Leviton rotary dimmer.
Lutron and Leviton have many 3-way dimmer styles, and both make 3-way rotary dimmers.

I remember years ago replacing 3-way switches with dimmers and having same experience as you. One dimmer has to be ON for the other dimmer to dim.

Later I learned when you replace both 3-way switches with dimmers, you buy a control-and-companion dimmer set. One dimmer is main, and it lets you dim from both locations. The two dimmers communicate with each other electronically. Buy these dimmers at lighting store that specializes in fixtures and dimmers. Ask for most experienced salesperson.

I checked to see if rotary dimmers are made in the companion set. And neither Leviton or Lutron show 3-way companion set rotary dimmers.

1) Leviton spec sheet on rotary 3-way dimmers does not show companion dimmer. This indicates that Leviton rotary dimmers don't have capability of communicating with each other.

2) Lutron has image of 3-way rotary dimmers.
Image shows single rotary dimmer in 3-way & 4-way circuit.
This tells me that Lutron does not have companion dimmer for 3-way rotary dimmer.

The Leviton 6681 is a push-button rotary-type incandescent dimmer with 600Watt capacity

If you have incandescent bulbs, the dimmer should work.
If the dimmer has different color wires, try reversing the wires.
If the dimmer replaced a 3-way switch, then this is not the right dimmer.
If you have compact florescent bulbs, you need a dimmer that also dims florescent.

http://www.google.com/products/catalog
Link shows the Leviton 6673 incandescent and florescent dimmer

But you also need dimmable compact florescent bulbs.
http://www.amazon.com/DIMMABLE-COMPACT-FLUORESCENT-LIGHT-SPIRAL/dp/B0014B84ZM

You cannot, at least not using the dimmer you have in your hand. The switch with all the wires is a four-way switch, which is used to make a "suicided" 3-way switch. The power comes in AND goes out to the light from that switch. The other switch is a 3-way. Neither one has the "ON" or "OFF" marks on them, do they? You can buy a 3-way dimmer, but i do not know if rotary-style 3-way switches exist. You will have to install the dimmer at the other switch because i am quite certain no 4-way dimmers are available.

i want two dimmer switch parrel they both fhave two black and one green how fo you wire it up