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This is the genuine OEM pressure switch assembly for the Carrier PG8MAA024045ACJA 80% AFUE gas furnace. The pressure switch is a critical safety component that monitors the negative pressure (vacuum) created by the induced draft blower to confirm proper venting before allowing the ignition sequence to proceed. When the inducer is running correctly, the switch closes and signals the control board to continue. If the switch fails — or if actual draft pressure is out of spec — the board locks out, and the furnace will not light. Common symptoms of a failed pressure switch include a furnace that attempts to start but halts before ignition, a flashing fault code indicating a pressure switch fault, or a unit that short-cycles continuously without producing heat.
Compatibility: Direct factory replacement for Carrier model PG8MAA024045ACJA 80% two-stage gas furnace. Also fits select Bryant and Payne furnace models sharing the HK06WC069 specification — verify your model's data plate W.C. rating before ordering. Our fitment team is available to confirm compatibility before you buy. Order today and your part ships the same business day.