OEM Carrier Furnace Pressure Switch 328529-751 for Model PG9MXA036080AASA

This is the genuine OEM Carrier pressure switch (part number 328529-751) factory-specified for the Carrier PG9MXA036080AASA 80% AFUE gas furnace. The pressure switch is a safety device that monitors negative pressure (draft) produced by the inducer motor before allowing the ignition sequence to proceed. When the switch fails or its hose port becomes blocked, the furnace will lock out before ignition — often displaying a pressure switch fault code — leaving you with no heat.

• Specs: Normally Open (N.O.) configuration | Monitors inducer/collector box pressure | Compatible W.C. rating matched to PG9MXA036080AASA inducer assembly | Direct OEM drop-in replacement, no modifications required
• OEM vs Generic: This is a genuine Carrier factory-authorized part. OEM switches meet exact W.C. trip-point tolerances specified for this furnace. Aftermarket units may trip at incorrect pressure thresholds, causing nuisance lockouts or — worse — failing to detect a true draft fault, creating a safety hazard.
• Install Difficulty: 2/5 — Shut off gas and power before servicing. Disconnect the rubber hose port and two spade wire terminals. Remove the single mounting screw, swap the switch, and reconnect. Tools needed: flat-head and Phillips screwdrivers, multimeter (to confirm switch continuity). Always clear any condensate blockage in the hose before installing.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PG9MXA036080AASA 80% AFUE single-stage gas furnace. Superseded by kit part 328529-752 which includes bracket and tubing hardware — order the kit if tubing or bracket components are also damaged. Verify your existing switch's W.C. rating on the data plate or switch body before ordering to ensure an exact match. Questions about fitment? Our HVAC parts team confirms compatibility before you buy — order with confidence and get your furnace running today.