OEM Carrier Draft Pressure Switch 0.18" WC for Model PY4GEAB36090AA — Part #HK06WC061

This OEM Carrier draft pressure switch is the factory-specified replacement for the Carrier PY4GEAB36090AA packaged unit. The pressure switch monitors negative pressure created by the inducer (draft) motor to confirm safe venting conditions before allowing ignition to proceed. When this switch fails or sticks open, the control board cannot verify inducer operation and will lock out the system entirely — leaving you with no heat. Common symptoms include the inducer running but the furnace never advancing to ignition, a blinking fault code indicating a pressure switch error, or the unit cycling repeatedly without lighting.

• Specs: 0.18" W.C. (water column) set point | Single-port proving switch | Normally open | Direct OEM replacement for Carrier PY4GEAB36090AA | Supersedes to current part # HK06MB061
• OEM vs Generic: OEM pressure switches are factory-calibrated to exact W.C. tolerances. Generic alternatives often drift out of spec under thermal cycling, causing nuisance lockouts or — more dangerously — masking a real venting failure. Always choose OEM for pressure switch replacements.
• Install Difficulty: 2/5 — Shut off power and gas before beginning. Disconnect the vacuum hose and two wire terminals, then swap the switch. Tools needed: flathead screwdriver, needle-nose pliers. Inspect the hose port and tubing for cracks or blockage before reinstalling.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY4GEAB36090AA packaged unit. Also fits select Bryant and Payne models requiring a 0.18" W.C. draft pressure switch. Verify your existing switch's W.C. rating and port count against your unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment — reach out before you order if you have any questions.