Erik:

A slave X-10 switch has a fairly simple function, but the switch can wear out over time. The part number you mentioned is a very low cost switch and the quality of the switch is not the best. I normally recommend that X-10 users purchase the newer rocker switches that are designed better and are of a higher quality. A true rocker dimmer slave switch runs about $22.

Up until recently, X-10 compativle switches only were available in one type, and were inexpensive. Now there are several brands and types of high quality X-10 switches available that are built to last. These switches are more expensive but at least consumers now have a choice.

It sounds like you just need to replace your slave switch because you master switch still works manually and via X-10 signals.

Robert
RCI Automation