OEM Carrier Draft Inducer Pressure Switch 0.18" WC for Model PY3GPAA36090NA (HK06WC061 / HK06MB061)

This is the factory-specified OEM replacement draft inducer pressure switch for the Carrier PY3GPAA36090NA packaged gas unit. The pressure switch monitors the negative pressure created by the draft inducer motor, proving safe venting conditions before the control board allows ignition to proceed. When this switch fails or sticks open, the furnace will lock out before ignition — commonly resulting in a no-heat call with a pressure switch fault code on your control board. A failed or weak inducer motor can also cause a good switch to fault, so always verify inducer operation before replacing the switch.

• Specs: 0.18" Water Column (W.C.) set point | SPST (Single Pole, Single Throw) | Negative pressure (closes on rise) | Factory-matched Carrier/Honeywell specification | Replaces OEM part numbers HK06WC061 and updated supersession HK06MB061, as well as Honeywell cross-references IS20224-5236 and 1639D2/B
• OEM vs Generic: OEM switches are calibrated to exact W.C. tolerances at the factory. Aftermarket pressure switches may carry ±10–15% W.C. variance, which can cause nuisance trips or, worse, allow ignition under unsafe draft conditions. The OEM part is the only risk-free choice for a gas appliance.
• Install Difficulty: 2/5 — Straightforward swap on most Carrier packaged units. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, and a digital manometer (recommended to verify inducer pressure before condemning the switch). Always confirm 24V at the switch terminals before replacing; a clogged condensate drain or failed inducer is frequently the root cause.
• Warranty: 1-year OEM manufacturer warranty. In-stock orders ship same business day from our warehouse when placed by 5 PM local time.

Compatibility: Engineered for Carrier model PY3GPAA36090NA packaged gas/electric units. Also fits select Bryant and Payne models using the same 0.18" W.C. SPST pressure switch specification — verify your data plate part number before ordering. Note: HK06WC061 has been superseded by HK06MB061; both part numbers are fulfilled with the current OEM production version. Questions about fitment? Our HVAC parts specialists confirm compatibility before you order — no guesswork.