OEM Carrier Draft Pressure Switch 0.18" WC for Model PY3GEAA42090AA — HK06WC061

This is the OEM factory-specified draft proving pressure switch for the Carrier PY3GEAA42090AA packaged gas heating unit. The pressure switch is a critical safety device that monitors negative pressure created by the inducer (draft) motor. Before allowing the ignition sequence to proceed, it confirms the inducer is operating correctly and that combustion gases are being properly vented. When this switch fails — or when a blocked flue, cracked hose, or weak inducer fools it — your furnace will lock out before ignition, leaving you with no heat. Common symptoms include the inducer running but the furnace failing to light, a blinking fault code for "pressure switch stuck open," or a system that short-cycles immediately after the heating call begins.

• Specs: 0.18" WC (inches water column) set point | SPST normally open | Compatible with 24V control circuit | Replaces OEM part HK06WC061 (superseded by HK06MB061) | Honeywell cross-reference: IS20224-5236
• OEM vs Generic: This OEM-spec switch is factory-calibrated to the exact 0.18" WC trip point required by the PY3GEAA42090AA. Off-spec generic switches with loose tolerances can cause nuisance lockouts or — more dangerously — fail to detect a true venting fault, creating a carbon monoxide risk.
• Install Difficulty: 2/5 — Turn off gas and power before servicing. Locate the switch on or near the inducer housing. Disconnect the hose port and two wire spade terminals (photograph first). Swap the switch and confirm the hose is free of cracks or blockages. Tools needed: flathead screwdriver, needle-nose pliers, and a manometer to verify set point if desired.
• Warranty: 1-year OEM factory warranty. In stock and ships the same business day from our warehouse.

Compatibility: Verified fit for Carrier model PY3GEAA42090AA packaged gas heating unit. Also fits select Bryant and Payne models using the HK06WC061 / HK06MB061 pressure switch. Always confirm the 0.18" WC rating on your existing switch before ordering. Our fitment team is available to verify compatibility before you buy — no guesswork required.