OEM Carrier Draft Inducer Pressure Switch 0.18" WC for Model PY4GNAB36090AA — HK06WC061

This OEM Carrier draft inducer pressure switch is the factory-specified replacement for the Carrier PY4GNAB36090AA packaged heat pump unit. The pressure switch monitors negative pressure created by the induced draft blower motor to confirm proper venting before allowing the ignition sequence to proceed. When it fails — or when the hose, port, or inducer is compromised — the furnace or heat pump will lock out prior to ignition, leaving you with a cold system and a fault code. Part number HK06WC061 has been superseded by the current OEM replacement HK06MB061, both of which are cross-referenced and fully compatible.

• Specs: 0.18" Water Column (WC) setpoint | SPST (Single-Pole, Single-Throw) | Draft proving / negative-pressure type | Honeywell-manufactured (OEM cross: IS20224-5236) | Factory ±tolerance matched
• OEM vs Generic: Genuine OEM switches are calibrated to the exact WC rating specified by Carrier engineering. Aftermarket pressure switches frequently deviate from their stated WC rating, causing nuisance lockouts or — worse — failing to detect an unsafe venting condition. Always match the rated WC exactly.
• Install difficulty: 2/5 — Power down the unit and confirm zero voltage at the board before starting. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, multimeter. Disconnect the rubber hose from the old switch, swap the switch, and reconnect. Always inspect the hose for cracks or blockages while you have access — a collapsed hose mimics switch failure.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day when ordered by 5 PM local time.

Compatibility: Engineered for the Carrier PY4GNAB36090AA packaged unit. Also fits select Bryant and Payne models sharing the same 0.18" WC pressure switch specification. Verify the WC rating printed on your existing switch before ordering — WC ratings are not interchangeable. Have a question about fitment? Our HVAC parts specialists confirm compatibility before you buy.