OEM Carrier HK06WC078 Air Pressure Switch for PG8MAA036070ADJA

The air pressure switch is a critical safety device on your Carrier PG8MAA036070ADJA. It proves that the inducer (draft) motor is actually pulling air through the heat exchanger and venting combustion gases before the board will allow the igniter and gas valve to fire. The switch is a diaphragm that closes on the negative pressure created by the running inducer. When it fails or its hose clogs, the furnace gets stuck: the inducer spins up but ignition never starts, and the board flashes a pressure-switch fault. Homeowners notice the blower or inducer cycling on and off with no heat, especially on cold or windy days when venting back-pressure rises. This is a genuine Carrier single-stage normally-open pressure switch (HK06 series) factory-calibrated to this furnace's trip point — on the order of -0.40" W.C. — with the correct port size and bracket. The contacts close at the rated negative pressure and open immediately if draft is lost, exactly as the original safety listing requires. Why OEM matters: the trip-point calibration is the whole job. A generic switch set even slightly off will either nuisance-trip a healthy inducer (no heat) or, worse, fail to open when venting is genuinely blocked — defeating the safety it exists to provide. The genuine Carrier switch matches the original setpoint precisely. Install difficulty: 2/5. Tools: 1/4" nut driver, and ideally a manometer or Magnehelic gauge plus a multimeter to confirm the switch closes at spec. #1 safety warning: kill power at the breaker first, and before condemning the switch, check the hose and inducer port for condensate, soot, or blockage — a clogged hose mimics a bad 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 PG8MAA036070ADJA. 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.