OEM Carrier Draft Pressure Switch 0.18" WC for Model PY4GPAB60090AA

This OEM draft pressure switch (part# HK06WC061, superseded by HK06MB061) is the factory-specified replacement for the Carrier PY4GPAB60090AA packaged unit. The pressure switch monitors negative pressure created by the induced draft blower and proves that adequate airflow exists before allowing the ignition sequence to proceed. When this switch fails or sticks open, the control board cannot confirm safe venting conditions — resulting in a no-heat lockout before the ignition cycle ever begins. Common symptoms include the inducer motor running continuously with no ignition attempt, or the system cycling off within the first few seconds of a call for heat.

• Specs: 0.18" W.C. (water column) set point | Normally open | Single-port | Replaces OEM part# HK06WC061 / HK06MB061 | Also cross-references Honeywell IS20224-5236
• OEM vs Generic: OEM pressure switches are calibrated to exact factory W.C. tolerances. Off-spec generic switches can open prematurely or fail to open at all — causing repeated lockouts or unsafe operation. Always match the W.C. rating precisely.
• Install difficulty: 2/5 — Shut off power and gas before beginning. Tools needed: 1/4" nut driver, needle-nose pliers, and a short length of replacement pressure tubing. Note port orientation and hose routing before disconnecting the old switch.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Fits Carrier model PY4GPAB60090AA packaged units, as well as a broad range of Carrier, Bryant, and Payne furnaces, packaged units, RTUs, and heat pumps that specify the 0.18" W.C. draft pressure switch. Verify the W.C. rating on your existing switch or equipment data plate before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — order with confidence and get same-day shipping.