OEM Carrier Draft Inducer Pressure Switch 0.18" WC for Model PY4GEAB42090NA

This OEM draft pressure switch (part number HK06WC061, factory-superseded by HK06MB061) is the direct replacement for the Carrier PY4GEAB42090NA packaged unit. The pressure switch monitors negative pressure created by the inducer motor to confirm safe venting conditions before the ignition sequence begins. When it fails or sticks open, the control board cannot verify that combustion gases are being exhausted properly — resulting in a no-heat lockout, a blinking fault code, or a furnace that cycles off before ignition ever fires.

• Specs: 0.18" W.C. (water column) setpoint | Normally open (N.O.) configuration | Honeywell IS20224-5236 equivalent | Factory-matched switching threshold for precise inducer proving
• OEM vs Generic: OEM pressure switches are calibrated to exact W.C. tolerances at the factory. Off-brand substitutes can trip at incorrect pressures — causing nuisance lockouts or, worse, failing to detect a blocked flue, creating a safety hazard.
• Install difficulty: 2/5 — Disconnect power before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, manometer (recommended for verification). Note the port orientation and hose routing before removing the old switch. Inspect rubber tubing for cracks while the switch is out.
• Warranty & Shipping: 1-year OEM factory warranty. Orders ship same business day from our warehouse. Note: OEM part number HK06WC061 has been superseded — this listing ships the current factory replacement HK06MB061, which is a direct drop-in substitute.

Compatibility: Engineered for the Carrier PY4GEAB42090NA packaged unit. Also fits 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. Our HVAC parts specialists are available to confirm fitment prior to purchase.