OEM Carrier Draft Pressure Switch 0.18" WC SPST for Model PY3GPAA42090NA

This OEM draft inducer pressure switch (part number HK06WC061, current updated replacement: HK06MB061) is the factory-specified replacement for the Carrier PY3GPAA42090NA packaged gas unit. The pressure switch proves that the inducer motor has established proper negative pressure (draft) before allowing the control board to energize the igniter and open the gas valve. When this switch fails or becomes stuck open, the furnace or packaged unit will lock out before ignition — often displaying a fault code for a failed pressure switch — leaving you with no heat and a frustrating no-start condition.

• Specs: 0.18" Water Column (W.C.) setpoint | SPST (Single-Pole Single-Throw) | Normally Open | Replaces Honeywell IS20224-5236 | OEM part HK06WC061 superseded by HK06MB061
• OEM vs Generic: OEM pressure switches are calibrated to the exact W.C. rating required by your unit's heat exchanger design. An off-spec generic switch can open too early or too late, causing nuisance lockouts or — more dangerously — allowing combustion without confirmed draft.
• Install difficulty: 2/5 — Power down the unit and confirm zero voltage before starting. Tools needed: #2 Phillips screwdriver, 1/4" nut driver, needle-nose pliers. Disconnect the rubber tubing and two spade terminals, swap the switch, reconnect, and verify operation through a full call-for-heat cycle.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse.

Compatibility: Engineered as a direct OEM fit for Carrier PY3GPAA42090NA packaged gas/electric units. Also fits select Bryant and Payne models using the same 0.18" W.C. SPST draft switch. Always confirm the W.C. rating on your existing switch or unit data plate before ordering. Have questions about fit? Our HVAC parts specialists verify compatibility before you buy — order with confidence and get it shipped today.