OEM Carrier Furnace Draft Pressure Switch 0.18 WC for Model PY3GNA060115AA

This OEM draft pressure proving switch is the factory-specified replacement for the Carrier PY3GNA060115AA gas furnace. The pressure switch 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, the furnace control board never receives the "all-clear" signal — resulting in a hard lockout, no heat, and a flashing fault code before a single ignition attempt is made.

• Specs: 0.18" W.C. (water column) set point | Normally open | Single-port design | Replaces OEM part HK06WC061 (superseded by HK06MB061) | Also cross-references Honeywell IS20224-5236
• OEM vs Generic: This factory-authorized OEM switch is calibrated to the exact 0.18" W.C. set point required by Carrier. Generic or off-tolerance switches can trip too early or too late, causing nuisance lockouts or — worse — allowing the furnace to fire without confirmed draft, creating a safety hazard.
• Install difficulty: 2/5 — Turn off power and gas before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, and a digital manometer to verify pressure post-install. Disconnect the rubber hose from the inducer port, unplug the wiring harness, and swap in the new switch. Always check the hose for cracks or blockages before replacing the switch.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PY3GNA060115AA packaged gas/electric unit. This part is also compatible with select Bryant and Payne models sharing the same 0.18" W.C. pressure switch specification — verify your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy.