OEM Carrier Draft Pressure Switch 0.18" WC for Model PY4GEAA60115AA

This OEM draft pressure switch (part number HK06WC061, superseded by HK06MB061) is the factory-specified replacement for the Carrier PY4GEAA60115AA packaged unit. The pressure switch monitors negative pressure created by the inducer motor to confirm proper venting before allowing the ignition sequence to proceed. When this switch fails or sticks open, the control board cannot verify safe flue operation and will lock out the heating cycle — leaving you with a system that powers on but produces no heat. Common failure symptoms include: the furnace or packaged unit attempting to start, the inducer running, but the unit shutting down before the gas valve opens and ignition occurs.

• Specs: 0.18" W.C. (water column) set point | Normally open | Factory-matched trip point tolerance | Replaces OEM part numbers HK06WC061 and HK06MB061 | Cross-references Honeywell IS20224-5236
• OEM vs Generic: This is a genuine OEM Carrier part manufactured to factory tolerances. Aftermarket switches often carry ±10–15% trip-point variance, which can cause nuisance lockouts or — worse — allow ignition under marginal draft conditions. OEM ensures exact pressure calibration every time.
• Install difficulty: 2/5 — Turn off power and gas before servicing. Locate the switch on the inducer housing, disconnect the rubber hose and two wire terminals, and swap in the new switch. Tools needed: 1/4" nut driver, needle-nose pliers. Always verify hose condition and replace if cracked or brittle. Test with a manometer if symptoms persist after replacement.
• Warranty & Shipping: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PY4GEAA60115AA packaged unit and is also compatible across select Carrier, Bryant, and Payne furnace, heat pump, and packaged unit models requiring a 0.18" W.C. draft pressure switch. Verify your existing switch's W.C. rating on the switch body label before ordering — an incorrect trip point will cause repeated lockouts. Questions about fitment? Our HVAC parts team confirms compatibility before you buy.