OEM Carrier Furnace Pressure Switch 0.18" WC for Model PY4GPAB36090NA (HK06WC061)

This OEM Carrier draft inducer pressure switch is the factory-specified replacement for the Carrier PY4GPAB36090NA packaged unit. The pressure switch monitors negative pressure created by the inducer motor to confirm that combustion airflow is safe and sufficient before allowing the ignition sequence to proceed. When this switch fails or sticks open, the furnace will not advance past the inducer stage — resulting in a no-heat lockout condition with the inducer motor running continuously but no spark or gas delivery.

• Specs: 0.18" W.C. (water column) setpoint | Single-port draft sensing | Normally open (N.O.) contact | OEM part HK06WC061, superseded by HK06MB061 | Compatible Honeywell cross-reference: IS20224-5236
• OEM vs Generic: This is a genuine OEM Carrier pressure switch manufactured to factory specifications. Generic alternatives often carry wider W.C. tolerances, which can cause nuisance lockouts or — more dangerously — fail to detect true inducer problems, creating a safety hazard.
• Install Difficulty: 2/5 — Power down the unit and disconnect the hose port and two electrical terminals before removal. Tools needed: flathead screwdriver, needle-nose pliers, and a manometer if verifying setpoint post-install. Always inspect the rubber sensing hose for cracks before reusing it.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PY4GPAB36090NA packaged unit. Also fits select Bryant and Payne models requiring a 0.18" W.C. normally-open draft pressure switch. Note that OEM part HK06WC061 has been superseded by HK06MB061 — both numbers are cross-referenced and fulfilled with the current production equivalent. Verify your existing switch's W.C. rating and port configuration before ordering. Our HVAC parts specialists are available to confirm fitment before you buy.