This is a BRAND NEW Honeywell Furnace Control Circuit Board. It's designed to replace all the Honeywell part #s listed below. Board comes with instructions and several wiring harnessness to convert old plug designs into this updated board. You will only use one of wiring harnesses in the package (if you require any of them)- discard the rest. Thanks for looking and good luck!
The control board is the "brain" of your unit, coordinating and executing the operation of other various components by sending voltage when and where needed. A control board is constantly monitoring sensors and safety switches in the unit.