OEM Carrier Draft Pressure Switch 0.18" WC for Model PY4GPAB48130AA

This is the genuine OEM draft-proving pressure switch for the Carrier PY4GPAB48130AA packaged unit. The pressure switch monitors negative pressure created by the inducer motor to confirm safe venting conditions before allowing the gas valve to open. When the switch fails or sticks open, the control board cannot verify inducer operation and will lock out the unit entirely — resulting in a no-heat call with no ignition attempt. Common symptoms include a constantly running inducer with no ignition, an error code for "pressure switch open," or intermittent heating that stops before the burners fire.

• Specs: 0.18" W.C. (water column) rated | SPST normally-open | Replaces Honeywell IS20224-5236 | OEM part HK06WC061 (superseded by HK06MB061)
• OEM vs Generic: OEM pressure switches are factory-calibrated to the exact W.C. setpoint for this unit. Off-spec aftermarket switches can trip too early or too late, causing nuisance lockouts or — more dangerously — allowing ignition without confirmed draft.
• Install Difficulty: 2/5 — Turn off gas and power before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, and a short length of replacement tubing. Photograph all hose and wire connections before removal. Verify tubing is clear of moisture or blockage before installing the new switch.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY4GPAB48130AA packaged unit. This part is also used across Bryant and Payne platforms sharing the same inducer/venting assembly. Always verify the W.C. rating on your existing switch or unit wiring diagram before ordering. Our parts specialists are available to confirm fitment before you buy.