OEM Carrier Pressure Switch 0.18 WC for Model PY3GNA042060AA (HK06WC061 / HK06MB061)

This OEM draft inducer pressure switch is the factory-specified replacement for the Carrier PY3GNA042060AA packaged unit. Rated at 0.18" WC (water column), this switch proves that the inducer motor has established proper negative pressure in the heat exchanger before allowing the gas valve to open. When this switch fails or sticks open, the furnace or packaged unit will lock out before the ignition sequence ever begins — leaving you with a blower running but no heat output. It is also sold under the updated Carrier part number HK06MB061, which is the current factory replacement for the discontinued HK06WC061.

• Specs: 0.18" WC setpoint | Normally open (N.O.) | Single-port design | Honeywell-manufactured (OEM cross: IS20224-5236) | Factory ±tolerance matched
• OEM vs Generic: OEM pressure switches are calibrated to exact water column specs at the factory. Generic aftermarket switches often carry wider tolerances, risking nuisance lockouts in cold weather or false "proof" signals that can mask a failing inducer motor.
• Install difficulty: 2/5 — Power down the unit at the breaker before starting. Tools needed: 1/4" nut driver, flathead screwdriver, manometer (recommended for verification). Photograph or label the single hose connection before removing. Confirm hose and port are free of cracks or blockages before installing the new switch.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse — order by 3 PM local time.

Compatibility: Engineered for the Carrier PY3GNA042060AA packaged unit and cross-references Carrier/Bryant/Payne platforms sharing the 0.18" WC pressure switch specification. Also replaces Honeywell IS20224-5236 and 1938D2/B. Verify the WC rating on your existing switch's label before ordering — using an incorrect WC setpoint can prevent ignition or allow unsafe operation. Have a fitment question? Our HVAC parts specialists confirm compatibility before you buy.