OEM Carrier Draft Inducer Pressure Switch 0.18" WC for Model PY3GNAA60090NA

This OEM draft pressure switch is the factory-specified replacement for the Carrier PY3GNAA60090NA gas furnace. The pressure switch monitors negative pressure created by the induced draft blower to confirm safe venting conditions before allowing ignition. When this switch fails or drifts out of calibration, the control board detects an unsafe condition and locks out the furnace — typically before the ignition sequence ever begins. Common symptoms include a furnace that runs the inducer motor briefly, then shuts off and flashes a pressure switch fault code, or a unit that will not advance past the draft proving stage at all.

• Specs: 0.18" W.C. (inches water column) set point | Normally open | Single-port design | Replaces OEM part HK06WC061 (superseded to HK06MB061) | Also cross-references Honeywell IS20224-5236
• OEM vs Generic: This is a genuine OEM-specification part with factory-calibrated trip point. Aftermarket pressure switches often carry a ±10–15% tolerance on the W.C. rating, which can cause nuisance lockouts or, worse, allow ignition under marginal venting conditions — a safety risk. OEM is the only choice for a life-safety component.
• Install Difficulty: 2/5 — Power down and lock out the furnace before starting. Locate the switch on the inducer housing, disconnect the rubber hose and two-wire harness, and swap the switch. Tools needed: flathead screwdriver, needle-nose pliers. Always inspect the hose for cracks or blockages while the switch is off — a collapsed hose is a frequent companion fault.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Fits Carrier model PY3GNAA60090NA packaged gas furnace. Also fits select Bryant and Payne models sharing the HK06WC061 / HK06MB061 specification — verify the 0.18" W.C. rating on your existing switch before ordering. Have a question about fitment? Our HVAC parts specialists confirm compatibility before you buy.