HK42FZ034 – ClimaTek Furnace Control Circuit Board Fits Carrier Bryant. Description This is a brand new ClimaTek Furnace Control Circuit Board. This is a brand new ClimaTek Furnace Control Circuit Board. This ClimaTek Part Directly Replaces Part # HK42FZ034. Top Quality ClimaTek Replacement Part, Built to Last! Works with Carrier Bryant and more! Open Box Condition Notice. Items are in perfect working condition. Items may have some minor signs of use, and the original protective wrapping may be absent or the item may be repackaged. All accessories will be included.