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Try putting your ferrite cores on the line going to the fan motor if you can.

Getting them closer to the source (the motor) of the noise should help.

Will it eliminate it? Probably not. But, it's worth a try.

Also, if this just started happening, it could be an indication of a problem with

the motor. I would be inclined to think that is the most likely problem, if this just

started happening and had not been going on since you started using the

AC/Heating unit.

Good luck. RFI can be tough to kill sometimes.

trucker