OEM Carrier Draft Pressure Switch 0.18" WC for Model PY4GEAA36060AA

This OEM draft-proving pressure switch is the factory-specified replacement for the Carrier PY4GEAA36060AA packaged unit. The pressure switch monitors the negative pressure created by the inducer motor to confirm proper venting before allowing the ignition sequence to proceed. When this switch fails or sticks open, the control board cannot verify safe combustion conditions — resulting in a hard lockout, no-heat call, or a furnace that attempts ignition and immediately shuts down without ever firing.

• Specs: 0.18" Water Column (WC) set point | SPST (Single Pole, Single Throw) | Normally open | OEM part number HK06WC061, superseded by HK06MB061 | Also cross-references Honeywell IS20224-5236
• OEM vs Generic: OEM pressure switches are calibrated to the exact 0.18" WC trip point required by Carrier's control board logic. Off-spec aftermarket switches can trip too early or too late, causing nuisance lockouts or — more dangerously — allowing ignition under unsafe venting conditions.
• Install difficulty: 2/5 — Turn off power and gas before servicing. Locate the switch on the inducer housing and disconnect the rubber sensing hose and two wire terminals. Tools needed: 1/4" nut driver, needle-nose pliers, multimeter (verify switch opens/closes at rated WC). Photograph all wiring before disconnecting.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered as a direct OEM replacement for the Carrier PY4GEAA36060AA packaged unit. This part also fits select Bryant and Payne models sharing the same inducer/pressure switch assembly — verify your unit's data plate WC rating before ordering. Questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — in stock and ships today.