OEM Carrier Draft Pressure Switch 0.18" WC for Model PY4GEAB60090NA

This OEM draft pressure proving switch is the factory-specified replacement for the Carrier PY4GEAB60090NA packaged unit. The pressure switch monitors negative pressure created by the inducer motor to confirm proper venting before allowing the ignition sequence to proceed. When it fails or sticks open, the control board cannot verify that the heat exchanger is being purged safely — resulting in a system lockout before the burners ever fire. Common symptoms include a furnace or packaged unit that attempts to start, runs the inducer briefly, then shuts down without igniting.

• Specs: 0.18" Water Column (W.C.) set point | SPST Normally Open | Factory-matched draft pressure rating | Replaces OEM part # HK06WC061 (superseded by HK06MB061)
• OEM vs Generic: OEM pressure switches are calibrated to exact W.C. tolerances at the factory. Off-spec generic switches can trip too early or too late, causing nuisance lockouts or — more dangerously — failing to detect a true venting fault.
• Install difficulty: 2/5 — Shut off power and gas before beginning. Tools needed: 1/4" nut driver, needle-nose pliers, and a short length of replacement pressure tubing (5/16" I.D. recommended). Photograph all hose and wiring connections before removal.
• Warranty: 1-year OEM factory warranty. In stock and ships the same business day from our warehouse.

Compatibility: Engineered for Carrier model PY4GEAB60090NA packaged units. This part directly supersedes the discontinued HK06WC061 and cross-references Honeywell IS20224-5236. Always verify the W.C. rating stamped on your existing switch before ordering. Have a question about fitment? Our HVAC parts specialists confirm compatibility before you buy — call or chat today.