OEM Carrier Pressure Switch 328529-751 for Model PG9MXA048080AASA

This OEM pressure switch (part number 328529-751) is the factory-specified replacement for the Carrier PG9MXA048080AASA gas furnace. The pressure switch is a safety device that monitors the negative pressure (draft) created by the inducer motor. When the inducer is operating correctly, the pressure switch closes and signals the control board to proceed with ignition. When this switch fails or becomes stuck open, the furnace locks out before ignition — leaving you with no heat and typically a diagnostic fault code on the control board.

• Specs: Burner Enclosure Pressure Switch | 0.91 W.C. setpoint | Normally Open (N.O.) position | Factory-matched OEM tolerance for Carrier PG9MXA048080AASA
• OEM vs Generic: This is a genuine OEM Carrier part — factory-calibrated to the exact W.C. rating required by your furnace. Generic pressure switches often carry ±10% tolerance variance, which can cause nuisance lockouts or, worse, unsafe operation by allowing ignition under improper draft conditions.
• Install Difficulty: 2/5 — Power down the furnace at the disconnect before beginning. Tools needed: 1/4" nut driver, needle-nose pliers, and a small flathead screwdriver for hose barb connections. Always label existing tubing runs before disconnecting. Confirm inducer motor operation and check hose for cracks or blockages before replacing the switch.
• Warranty: 1-year OEM factory warranty. Ships same business day from our stocked warehouse.

Compatibility: Directly fits Carrier model PG9MXA048080AASA. Also superseded by Carrier kit 328529-752 and cross-references legacy part numbers HK06NB013 and 326070-701. Always verify the W.C. rating on your unit's data plate before ordering. Have a fitment question? Our HVAC parts specialists verify compatibility before you buy — order with confidence.