Carrier HK42FZ064 Control Board 323613-751 It provides the central control

It provides the central control board with precise thermistor data from the lower section of the tank to manage thermal stacking and prevent high-limit tripping

it is professional best practice to inspect the blower wheel and replace the mounting gasket to prevent CO leakage

Since this is a normally closed switch

the 93-7B-HD is the head mechanism only

OEM Precision: Direct Carrier replacement gas valve ensures exact fitment and eliminates the troubleshooting headaches associated with universal aftermarket components

Carrier HK42FZ064 Control Board 323613-751 It provides the central controlReplace a failing or shorted furnace control with the Carrier HK42FZ064 Control Board, the definitive OEM replacement for maintaining communication between your thermostat, inducer motor, and blower. As a veteran grade HVAC furnace control board, this unit is engineered to manage critical furnace ignition sequences and safety protocols, specifically resolving furnace error codes such as 1 3 (Limit circuit lockout) or 3 4 (Ignition proving failure).