This is a BRAND NEW OEM Aprilaire Humidifier Control Circuit Board.  The Aprilaire part # is 4238 (also EM1701).  Thanks for looking and good luck!

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This Item is used in Aprilaire Humidifier Models: 700 760 760A 768


On Mar-28-12 at 20:11:29 PDT, seller added the following information: