OEM Carrier Draft Inducer Pressure Switch 0.18" WC for Model PY4GPAB42060AA

This is the factory-authorized OEM replacement pressure switch for the Carrier PY4GPAB42060AA packaged heat pump unit. The draft inducer pressure switch is a normally open, single-pole single-throw (SPST) safety device rated at 0.18" water column (WC). It monitors 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 never receives the "draft proven" signal — resulting in a no-heat condition, a blinking fault code, or a system lockout before any ignition attempt is made.

• Specs: 0.18" WC setpoint | SPST normally open | Replaces OEM part numbers HK06WC061 & current successor HK06MB061 | Also cross-references Honeywell IS20224-5236
• OEM vs Generic: OEM switches are manufactured to exact setpoint tolerances. Off-brand pressure switches frequently carry ±10–15% variance in trip pressure, which can cause nuisance lockouts or — more dangerously — allow the system to attempt ignition without confirmed draft, a serious safety risk.
• Install Difficulty: 2/5 — Power down the unit at the disconnect before starting. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, and a manometer or magnehelic gauge for verification. Photograph existing hose and wiring connections before removal. Snap-fit connectors release with gentle lateral pressure.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3:00 PM local time.

Compatibility: Designed for the Carrier PY4GPAB42060AA packaged unit. This part is also used across a wide range of Carrier, Bryant, and Payne packaged and split-system equipment that specifies the 0.18" WC draft pressure switch. Always verify the WC rating on your existing switch's label before ordering. Have a question about fitment? Our HVAC parts specialists confirm compatibility before you buy — order now and we'll ship today.