OEM Carrier Draft Pressure Switch 0.18 WC for Model PY3GEAA48090AA

This OEM draft inducer pressure switch is the factory-specified replacement for the Carrier PY3GEAA48090AA packaged unit. The pressure switch monitors negative pressure created by the inducer motor to confirm safe venting conditions before the control board allows ignition. When it fails or sticks open, the system enters a safety lockout — typically before the igniter ever fires — resulting in a no-heat call. A faulty pressure switch is one of the most common causes of furnace lockout codes and is often misdiagnosed as an igniter or control board failure.

• Specs: 0.18" W.C. (inches water column) set point | Draft-proving / inducer pressure switch | Normally open | Compatible with single-stage induced-draft packaged units | OEM part number HK06WC061, superseded to HK06MB061
• OEM vs Generic: OEM switches are calibrated to exact W.C. tolerances from the factory. Generic pressure switches often have looser trip-point tolerances, which can cause nuisance lockouts or — more dangerously — allow ignition under marginal venting conditions.
• Install difficulty: 2/5 — Turn off power and gas before starting. Tools needed: 1/4" nut driver, flathead screwdriver, manometer (recommended to verify W.C. after install). Photograph all hose and wiring connections before removal. Inspect rubber tubing for cracks or blockages before replacing the switch.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before 3:00 PM local time.

Supersession Notice: OEM part number HK06WC061 has been factory-superseded by HK06MB061 — both part numbers are fully interchangeable and the correct replacement for the Carrier PY3GEAA48090AA. Also fits select Bryant and Payne models with the same 0.18" W.C. specification — verify your unit's data plate before ordering. Our team is available to confirm fitment prior to purchase. Order today and ship today.