OEM Carrier Draft Pressure Switch 0.18" WC for Model PY3GEAA36060NA — HK06WC061 / HK06MB061

This OEM Carrier draft-proving pressure switch is the factory-specified replacement for the Carrier PY3GEAA36060NA 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 furnace will lock out before ignition — you may see a fault code indicating a pressure switch error, or the system will simply fail to light with the inducer running normally.

• Specs: 0.18" Water Column (WC) | SPST (Single Pole, Single Throw) | OEM Part # HK06WC061 / HK06MB061 | Replaces Honeywell IS20224-5236 | Factory-matched setpoint tolerance
• OEM vs Generic: OEM pressure switches are calibrated to the exact setpoint specified by Carrier engineering. Off-brand switches with loose WC tolerances can cause nuisance lockouts or, worse, allow ignition under unsafe venting conditions — a risk not worth taking with gas appliances.
• Install difficulty: 2/5 — Straightforward swap once the furnace cabinet is open. Turn off power and gas before starting. Tools needed: 1/4" nut driver, flat-head screwdriver, and a multimeter to confirm switch continuity after install. Inspect the pressure tubing for cracks or blockages before reusing it.
• Warranty & Shipping: Backed by Carrier's OEM parts warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3GEAA36060NA packaged unit. Note that OEM part number HK06WC061 has been superseded by HK06MB061 — both numbers are fulfilled with the current production part. Also fits select Bryant and Payne models sharing this pressure switch specification. Always verify the 0.18" WC rating on your unit's wiring diagram or data plate before ordering. Our fitment team is available to confirm compatibility before you buy.