OEM Carrier Furnace Draft Pressure Switch 0.18" WC for Model PY3GNAA36090AA

This OEM Carrier draft pressure switch (part number HK06WC061, superseded by HK06MB061) is the factory-specified replacement for the Carrier PY3GNAA36090AA packaged gas unit. The pressure switch is a critical safety device that monitors negative air 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 prior to ignition — often displaying a fault code — leaving you with no heat. Common symptoms include the inducer motor spinning but the furnace never advancing to the heating cycle, or repeated short-cycling with a pressure switch fault code.

• Specs: 0.18" W.C. (inches water column) set point | Draft/inducer proving switch | Normally open | Compatible with Honeywell IS20224-5236 / 1639D2/B cross-reference | Supersedes HK06WC061 with updated part HK06MB061
• OEM vs Generic: OEM pressure switches are factory-calibrated to exact W.C. tolerances. Generic aftermarket units can drift outside spec, causing nuisance lockouts or — worse — failing to detect true venting problems, creating a safety risk.
• Install Difficulty: 2/5 — Turn off gas and power before servicing. Tools needed: Phillips and flathead screwdrivers, 1/4" nut driver, multimeter (to verify continuity across switch terminals with inducer running). Photograph tubing routing before disconnecting. The hose barb and single port make for a straightforward swap.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered for the Carrier PY3GNAA36090AA packaged gas/electric unit. Also fits select Bryant and Payne models sharing the same 0.18" W.C. pressure switch specification — always verify your unit's data plate and existing switch rating before ordering. Our HVAC parts specialists are available to confirm fitment before you buy. Order today and we'll ship the same business day.