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the 93-7B-HD is the head mechanism only
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
OEM Precision: Direct Carrier replacement gas valve ensures exact fitment and eliminates the troubleshooting headaches associated with universal aftermarket components
24 inches water column for exact safety compliance with original equipment manufacturer specifications
As a direct replacement for RS3210 and RS321P
Carrier HK42FZ064 Control Board 323613-751 the 93-7B-HD is the headReplace 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).