OEM Carrier Draft Inducer Pressure Switch 0.18" WC for Model PY4GEAB42060AA

This OEM draft pressure proving switch is the factory-specified replacement for the Carrier PY4GEAB42060AA packaged unit. The pressure switch monitors negative pressure created by the inducer motor to confirm proper venting before allowing ignition to proceed. When it fails or sticks open, the control board never receives the "all clear" signal — resulting in a furnace that locks out before any ignition attempt, leaving you with no heat. A faulty pressure switch is one of the most common causes of a furnace that runs the inducer but never lights.

• Specs: 0.18" W.C. (water column) setpoint | Normally open | SPST configuration | Cross-references Honeywell IS20224-5236 | Supersedes legacy part HK06WC061 — current OEM replacement is HK06MB061
• OEM vs Generic: This OEM switch is factory-calibrated to the exact 0.18" W.C. trip point required by the PY4GEAB42060AA control board. Off-spec generic switches can trip too early or too late, causing nuisance lockouts or — more dangerously — allowing ignition under poor venting conditions.
• Install difficulty: 2/5 — Shut off power and gas before servicing. Tools needed: 1/4" nut driver, needle-nose pliers, and a manometer if verifying inducer pressure. Photograph or label the hose and wire connector before disconnecting. Swap hose and wire to the new switch and restore power.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PY4GEAB42060AA packaged unit. Also fits a range of Carrier, Bryant, and Payne furnaces, packaged units, heat pumps, and air handlers that specify the 0.18" W.C. draft pressure switch — always confirm the W.C. rating on your existing switch before ordering. In stock and ready to ship — order today and get your system back online fast.