OEM Carrier Draft Pressure Switch 0.18" WC for Model PY3GNA036090NA

This OEM factory-authorized draft pressure switch is the factory-specified replacement for the Carrier PY3GNA036090NA packaged unit. The pressure switch monitors negative pressure created by the inducer motor to verify safe venting conditions before allowing the ignition sequence to proceed. When this switch fails or sticks open, the furnace will enter a safety lockout — halting the entire heating cycle before a single spark fires. Common symptoms include a system that attempts to start, runs the inducer, then shuts down with no heat output.

• Specs: 0.18" W.C. (water column) set point | Normally open | SPST configuration | Honeywell IS20224-5236 / 1938D2/B cross-reference | OEM part HK06WC061 / superseded by HK06MB061
• OEM vs Generic: This is a factory-authorized OEM part manufactured to Carrier's exact switching threshold. Generic aftermarket switches frequently deviate from the rated W.C. set point, which can cause nuisance lockouts or — more dangerously — allow operation under unsafe venting conditions.
• Install Difficulty: 2/5 — Power down the unit and confirm the inducer has fully stopped before disconnecting the pressure switch hose or wiring. Tools needed: flathead screwdriver, needle-nose pliers. Inspect the rubber hose for cracks or blockages before installing the new switch, as hose failures are a common root cause of switch failure.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered for Carrier PY3GNA036090NA packaged units. Also fits select Bryant and Payne models with a 0.18" W.C. pressure switch specification — always verify the W.C. rating on your unit's data plate or existing switch before ordering. Need help confirming fitment? Our HVAC parts team verifies compatibility before you buy — in stock and ready to ship today.