OEM Carrier Draft Pressure Switch 0.18" WC for Model PY4GPAA36060AA — HK06WC061

This is the factory OEM pressure switch for the Carrier PY4GPAA36060AA packaged unit. The pressure switch monitors negative pressure created by the draft inducer blower to confirm safe venting conditions before allowing the ignition sequence to proceed. When this switch fails or sticks open, the system enters a safety lockout — you'll typically see a no-heat condition with the inducer running but the furnace never advancing past the pre-purge stage. It may also trigger a diagnostic fault code related to pressure switch failure.

• Specs: 0.18" W.C. (water column) setpoint | Normally open | Single-port design | Replaces OEM part HK06WC061 / superseded to HK06MB061 | Cross-references Honeywell IS20224-5236
• OEM vs Generic: This is a genuine OEM-specification part manufactured to exact factory tolerances. Generic pressure switches can vary in actuation pressure, leading to nuisance lockouts or — more dangerously — failure to detect a true venting fault.
• Install difficulty: 2/5 — Power down and lock out the unit before servicing. Tools needed: 1/4" nut driver, needle-nose pliers, and a manometer (recommended to verify switch setpoint after install). Disconnect the hose and two wires, swap the switch, reconnect, and confirm normal operation through a full heat cycle.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Fits Carrier model PY4GPAA36060AA packaged units. Also compatible across Carrier, Bryant, and Payne furnace, packaged unit/RTU, heat pump, and air handler applications requiring a 0.18" W.C. pressure switch. Always verify the W.C. rating on your existing switch label before ordering — even a small setpoint mismatch can cause repeated lockouts. Questions about fitment? Our HVAC parts team confirms compatibility before you order.