OEM Carrier Furnace Pressure Switch 0.18 WC for Model PY3GNAA48090AA — Part HK06WC061

This OEM Carrier draft inducer pressure switch is the factory-specified replacement for the Carrier PY3GNAA48090AA packaged gas unit. The pressure switch monitors negative pressure created by the induced draft blower motor to confirm safe venting conditions before allowing the ignition sequence to proceed. When this switch fails or sticks open, the control board cannot verify inducer operation and will lock out the furnace — typically before a spark or ignition attempt is even made. Common symptoms include a furnace that runs the inducer but never attempts to light, a flashing fault code for pressure switch open, or a unit that clicks through a startup cycle repeatedly without producing heat.

• Specs: 0.18" W.C. (water column) setpoint | Normally open | SPNO configuration | Honeywell cross-reference IS20224-5236 | Replaces OEM part numbers HK06WC061 and updated successor HK06MB061
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part meeting exact factory W.C. tolerances. Aftermarket switches often carry ±10–15% W.C. variance, causing nuisance lockouts or — more dangerously — allowing operation with a partially blocked flue.
• Install difficulty: 2/5 — Disconnect power before servicing. Tools needed: 1/4" nut driver, flat-head screwdriver, and a manometer or magnehelic gauge to verify W.C. reading post-install. Always inspect the rubber hose port and tubing for cracks or blockages before replacing the switch alone.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PY3GNAA48090AA packaged gas/electric units. Also fits Bryant and Payne models sharing the HK06WC061 / HK06MB061 pressure switch specification. Verify the 0.18" W.C. rating on your unit's existing switch before ordering — incorrect W.C. setpoints will cause lockout or unsafe operation. Questions about fitment? Our team confirms compatibility before you buy.