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There are two possible problems. Usually the FA-AD MUST go on the power end of the 3-way system and the FAELV-500M must go on the "switch leg" side of the 3-way system. If you have them reversed then the AD will not work because it does not always have power. The other option is that there may be a small "air gap" switch on the accesorry dimmer that disconnects power but usually that will make neither switch work.