OEM Carrier Draft Inducer Pressure Switch 0.18" WC for Model PY4GEAA48130AA

This is the OEM factory-specified draft pressure switch for the Carrier PY4GEAA48130AA packaged unit. The pressure switch monitors negative pressure generated by the inducer motor to confirm proper venting before allowing ignition to proceed. When this switch fails or becomes stuck, the control board cannot verify a safe flue path and will lock out the system — preventing any heat output. Common symptoms include a furnace that hums briefly and shuts down, an LED fault code indicating a pressure switch fault, or a system that cycles the inducer but never advances to ignition.

• Specs: 0.18" W.C. (inches water column) set point | Normally open | Single-port design | Replaces Honeywell IS20224-5236 | Factory-authorized OEM part — also superseded under part number HK06MB061
• OEM vs Generic: OEM pressure switches are calibrated to exact W.C. specifications at the factory. Off-brand substitutes often carry wide tolerances, leading to nuisance trips or, worse, failure to open on a true venting fault — a potential safety hazard.
• Install difficulty: 2/5 — Power down and tag out the unit before beginning. Tools needed: 1/4" nut driver, flathead screwdriver, and a manometer or magnehelic gauge to verify inducer static pressure post-installation. Disconnect the hose port and two wire leads, swap the switch, and confirm fault codes clear on first call for heat.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PY4GEAA48130AA packaged unit. This switch fits Bryant, Payne, and Carrier equipment requiring a 0.18" W.C. normally-open draft proving switch. Verify the W.C. rating stamped on your original switch before ordering — other W.C. ratings are NOT interchangeable. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy.