Originally Posted by
SparkyCoog
You can't have a mechanical 4-way switch there. You need another Companion/Accessory/Remote (never figured out why Lutron had 3 names for the same thing depending on the product) switch.
Of course, the 4-way will have 4 wires in it and you only have 3 connections (not counting the ground) on the companion dimmer but you need to look at the wiring diagram - the blue one will get two wires. Just remember that the blue screw has to connect to every other blue screw and the rest work themselves out.