OEM Carrier Furnace Air Pressure Switch for PG8DAA036070AAJA

The pressure switch is a safety interlock that proves the inducer (draft) motor is moving combustion air before the control board will allow ignition. On your Carrier PG8DAA036070AAJA, a rubber hose connects the switch to the inducer housing; when the inducer spins up, the negative pressure it creates closes the switch contacts and tells the board the venting is clear. If the switch fails to close — or a blocked vent, cracked hose, or weak inducer keeps it open — the furnace will not light. The hallmark symptom is the inducer running continuously while the burners never ignite, usually paired with a pressure-switch fault code flashed on the control board. This OEM pressure switch is set to the exact trip point (measured in inches of water column, typically around -0.40" to -0.70" W.C. depending on revision) specified for the PG8 packaged unit, with the correct single/dual-port configuration and connector. The setpoint is factory-calibrated; a switch with the wrong threshold either nuisance-trips on a healthy unit or, worse, allows ignition when venting is restricted. Why OEM matters: this is a code-mandated safety device. Generic switches frequently carry a different W.C. rating or looser tolerance, which defeats the purpose of the interlock — too tight and you get constant no-heat lockouts; too loose and it can fail to detect a blocked flue, risking dangerous CO spillage. OEM calibration keeps the safety margin exactly where Carrier engineered it. Install difficulty: 2/5. Tools: 1/4" nut driver, pliers for the hose clamp, multimeter for continuity. SAFETY: turn off the gas and the electrical disconnect before servicing, and inspect the hose and vent for blockage — a failed switch is often the messenger, not the root cause. 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 PG8DAA036070AAJA. 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.