OEM Carrier Draft Pressure Switch 0.18" WC for Model PY4GPAA42060AA

This OEM draft-proving pressure switch is the factory-specified replacement for the Carrier PY4GPAA42060AA packaged heating and cooling unit. The pressure switch monitors negative pressure created by the induced draft motor to confirm that combustion gases are properly venting before the ignition sequence is allowed to proceed. When it fails or sticks open, the control board cannot verify inducer operation and will lock out the furnace — leaving you with no heat and often a blinking fault code indicating a pressure switch error.

• Specs: 0.18" Water Column (W.C.) | SPST — Normally Open | Replaces OEM part# HK06WC061 (superseded by HK06MB061) | Also replaces Honeywell IS20224-5236
• OEM vs Generic: This is a genuine Carrier OEM part, factory-calibrated to the exact 0.18" W.C. trip point required by the PY4GPAA42060AA. Generic switches often carry wider pressure tolerances, risking nuisance lockouts or — worse — failing to detect a true venting fault.
• Install difficulty: 2/5 — Shut off power and gas before beginning. Tools needed: 1/4" nut driver, flat-head screwdriver, needle-nose pliers. Disconnect the rubber hose and two wire terminals, swap the switch, and reconnect. Always check the hose for cracks or blockages while you're in there.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered for the Carrier PY4GPAA42060AA packaged unit. This part is also cross-compatible with select Bryant and Payne models sharing the same 0.18" W.C. pressure switch specification — verify your unit's data plate and existing switch rating before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy.