OEM Carrier Air Pressure Switch HK06WC078 for PG8UAA024045ACJA

The HK06WC078 air pressure switch is a safety interlock that confirms the inducer (draft) motor is actually pulling combustion air and venting flue gases before your Carrier PG8UAA024045ACJA furnace is allowed to light. A rubber hose connects it to the inducer housing; when the motor creates the correct negative pressure, the switch closes and signals the control board to proceed with ignition. If the switch never closes — or opens during a cycle — the board halts the sequence to prevent dangerous flue-gas spillage. Symptoms: the inducer motor spins up and keeps running, but the igniter never glows and the burners never light, often followed by a lockout and a specific "pressure switch" LED fault code. Blocked condensate drains, cracked hoses, or a weak inducer commonly trip it. Specs: this is a single-pole, normally-open diaphragm switch calibrated to a specific set point measured in inches of water column (around –0.50 to –0.70 in. w.c. for this furnace family). The set point is stamped on the switch body and is model-specific — it must match the inducer's airflow and the unit's venting. Why OEM matters: generic pressure switches ship with approximate set points and looser diaphragm tolerances. A switch that trips at the wrong pressure either nuisance-locks a healthy furnace or, worse, closes when draft is actually inadequate — defeating the safety. The genuine HK06WC078 is calibrated to Carrier's exact set point. Install difficulty: 2 of 5. Tools: 1/4" nut driver, and a manometer if you want to verify actual draft pressure. SAFETY: kill the breaker before servicing, and inspect the hose and inducer port for blockage before assuming the switch is bad. 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 PG8UAA024045ACJA. 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.