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Furnace Control Circuit Board Replaces Carrier Bryant Payne HK42FZ019 HK42FZ020. This is a new Furnace Control Circuit Board. It replaces the part numbers listed below. 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. Replaces Old Part #s. Partial List of Units that Use This Item. Hit Ctrl + F and enter your model number for a quick search!