Is it a three way dimmer? If not, then neither switch has to be replaced,
AFAIK......rather, you have to add the dimmer as an additional switch to
the circuit. The three way switches control the power going to the
lighting unit.....the dimmer will only be used for controlling the amount
of light level you wish the light unit to emit. Therefore, the dimmer is
added between the switches and the lighting unit.
BTW, if you add a non-three way dimmer switch to the circuit, there is
always the potential that the dimmer switch will be turned completely off,
in which case, the three way switching system becomes inoperative until the
dimmer switch is once again turn to it's on position. To circumvent this
eventuality, it probably would be just better to install just a dimmer unit
without any switching capabilities rather than a dimmer switch.
Just so it is in the location that you are most likely to want to dim the
lights. Seems obvious, but I told my builder I wanted my can lights on a
dimmer and he put the dimmer as the switch near the outside door. It would
be more convenient near the hallway door which is closer to the 'living
space', so I'm going to have to swap them.
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