OEM Carrier Pressure Switch for Model PG9MXA036060AASA (Part# 328529-751)

This is the genuine OEM replacement pressure switch for the Carrier PG9MXA036060AASA packaged gas unit. The pressure switch is a critical safety component that monitors the negative pressure (draft) created by the inducer motor before allowing the ignition sequence to proceed. If the switch does not close — due to a failed inducer, blocked flue, cracked hose, or a faulty switch itself — the control board will lock out the furnace and prevent any heating cycle from starting. Replacing a failed pressure switch with the correct OEM part restores proper draft-proving and safe ignition sequencing.

• Specs: OEM Part# 328529-751 | Factory water-column (W.C.) rating matched to Carrier PG9MXA036060AASA | Single-port hose fitting | 24V control circuit compatible
• OEM vs Generic: This is a genuine Carrier OEM switch calibrated to the exact W.C. setpoint required by the PG9MXA036060AASA. Aftermarket switches with incorrect W.C. ratings can cause nuisance lockouts or, worse, allow ignition under unsafe draft conditions — always match the factory spec.
• Install difficulty: 2/5 — Shut off power and gas before servicing. Tools needed: 1/4" nut driver, small flathead screwdriver, multimeter (to confirm switch continuity). Inspect the rubber hose and condensate trap for blockages before condemning the switch — they are common root causes of pressure switch failure.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse.

Compatibility: Engineered and factory-specified for the Carrier PG9MXA036060AASA packaged gas unit. Always verify the part number on your existing switch label before ordering to confirm W.C. rating and hose port configuration match. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you order — contact us today and get your part shipped the same day.