OEM Carrier Draft Inducer Pressure Switch 0.18" WC for Model PY3GNA060090NA

This OEM pressure switch (part number HK06WC061, superseded by HK06MB061) is the factory-specified draft inducer pressure switch for the Carrier PY3GNA060090NA gas furnace. Its job is to verify that the inducer motor is creating sufficient negative pressure (draft) before allowing the ignition sequence to proceed — a critical safety function. When this switch fails or sticks open, the furnace will lock out before any ignition attempt, leaving you with a no-heat call. Common symptoms include a blinking fault code for "pressure switch open," an inducer motor that runs but never advances to ignition, or a furnace that cycles the inducer repeatedly without lighting.

• Specs: 0.18" W.C. (water column) set point | Normally open, closes on negative pressure | Single-port hose barb | Compatible with Carrier, Bryant, and Payne furnace platforms | Cross-references Honeywell IS20224-5236
• OEM vs Generic: This is a genuine OEM Carrier part, factory-calibrated to the exact 0.18" W.C. threshold required by the PY3GNA060090NA. Generic switches often carry wider tolerance bands that can cause nuisance lockouts or — more dangerously — fail to detect a blocked flue condition.
• Install Difficulty: 2/5 — Turn off power and gas before beginning. Tools needed: #2 Phillips screwdriver, 1/4" nut driver, and needle-nose pliers to remove the rubber pressure hose. Inspect the hose for cracks or blockages while the switch is out. Reconnect the single wire harness and hose barb, then restore power and test.
• Warranty: 1-year OEM factory warranty. Orders ship same business day from our warehouse when placed before cutoff.

Compatibility: Designed for the Carrier PY3GNA060090NA packaged gas/electric unit. This part is also cross-referenced under successor part number HK06MB061 and Honeywell IS20224-5236 / 1938D2/B. Always confirm the 0.18" W.C. rating on your unit's existing switch before ordering. Our HVAC parts specialists are available to verify fitment — contact us before you order if you have any questions.