OEM Carrier Air Pressure Switch for PG8MAA066135ADJA Furnace

The air pressure switch is a safety device that confirms the inducer (draft) motor is actually moving combustion air before the board allows ignition. On the PG8MAA066135ADJA, the inducer starts, pulls a vacuum on the switch hose, and the switch closes to prove proper venting and flue draft. If draft is blocked or weak, the switch stays open and the furnace will not light. The classic symptom is a furnace that runs the inducer, hums for a moment, then shuts down without igniting — often a 2-flash "pressure switch did not close" or "stuck open" code. Homeowners see the unit cycle the inducer repeatedly with no heat, especially after a blocked flue, condensate-clogged port, or a switch that has drifted out of calibration. This OEM pressure switch is set to the exact factory trip point — measured in inches of water column ("WC) — for this furnace's venting. Using the correct setpoint is critical: a switch rated even a tenth of an inch off will either nuisance-trip on normal draft or, dangerously, allow ignition under poor venting. For pressure switches, OEM calibration is a safety matter, not a preference. Generic switches with looser tolerances or the wrong "WC rating can mask a real venting fault — letting the furnace fire when flue gases aren't clearing properly. Matching the OEM setpoint preserves the certified combustion-safety logic. Install difficulty: 2/5. Tools: 1/4" nut driver and a manometer to confirm the new switch closes at spec. Safety: kill power at the breaker before servicing, and inspect the rubber hose and inducer port for blockage — a clogged port mimics a failed switch. Ships same business day from our stocked warehouse on orders placed before 3 PM CST. Backed by a 1-year OEM warranty and 30-day hassle-free returns on uninstalled parts.

Compatibility

This part is compatible with Carrier model PG8MAA066135ADJA. Always verify the part number against your unit's data plate before ordering.

Why Choose OEM?

OEM parts are manufactured to the exact factory specifications for your unit. Generic aftermarket alternatives may fit physically but often use lower-rated components that reduce equipment life and void manufacturer warranties. When the cost difference between OEM and generic is $10-30, the OEM part is always the smarter investment on a system worth $5,000-$15,000.

Shipping & Returns

Same-day shipping on orders before 3 PM CST. Standard delivery 2-5 business days, express options available at checkout. 30-day hassle-free returns on uninstalled parts — free return shipping included. 1-year OEM factory warranty coverage.