OEM Carrier Draft Pressure Switch 0.18" WC for Model PY3GNA042090NA

This OEM draft inducer pressure switch is the factory-specified replacement for the Carrier PY3GNA042090NA packaged gas unit. Originally sold as part number HK06WC061 and now superseded by HK06MB061, this switch proves that the inducer motor has established proper negative pressure before allowing the ignition sequence to begin. When the pressure switch fails or sticks, the furnace will lock out before ignition — leaving you with no heat. Common symptoms include a cycling inducer with no spark, a blinking fault code indicating a pressure switch fault, or a system that starts briefly then shuts down.

• Specs: 0.18" W.C. (inches water column) setpoint | Normally open (N.O.) | Single-port design | Factory-matched Honeywell-manufactured switch (cross-ref: IS20224-5236) | Original P/N HK06WC061 superseded by HK06MB061 — direct drop-in replacement
• OEM vs Generic: OEM pressure switches are calibrated to exact W.C. tolerances at the factory. Generic alternatives often drift out of spec over time, causing nuisance lockouts or, worse, unsafe ignition attempts. This is a safety-critical component — OEM is strongly recommended.
• Install Difficulty: 2/5 — Straightforward swap accessible from the blower/burner compartment. Tools needed: flathead and Phillips screwdrivers, 1/4" nut driver. Always power down the unit at the breaker before servicing. Photograph tubing and wiring connections before disconnecting. Inspect hose barb and rubber tubing for cracks before reassembly.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse. Fast, reliable shipping nationwide.

Compatibility: Engineered for the Carrier PY3GNA042090NA packaged gas/electric unit. Also fits a wide range of Carrier, Bryant, and Payne furnaces and packaged units specifying the 0.18" W.C. draft pressure switch. Always verify your unit's existing switch W.C. rating on the data plate or wiring diagram before ordering. Have a fitment question? Our HVAC parts specialists confirm compatibility before you buy — reach out before placing your order.