OEM Carrier Draft Pressure Switch 0.18" WC for Model PY4GPAB48115AA (HK06WC061 / HK06MB061)

This OEM Carrier draft inducer pressure switch is the factory-specified replacement for the Carrier PY4GPAB48115AA packaged unit. The pressure switch monitors negative pressure created by the inducer blower motor to confirm safe venting conditions before allowing the ignition sequence to proceed. When this switch fails or sticks, the control board cannot verify inducer operation and the system will lock out — typically presenting as a furnace that attempts to start but shuts down before the burners ever light. A fault code pointing to a pressure switch or inducer circuit is the most common diagnostic indicator.

• Specs: 0.18" W.C. (water column) setpoint | SPST normally-open | Cross-references Honeywell IS20224-5236 | OEM part HK06WC061, superseded by HK06MB061
• OEM vs Generic: This is a genuine OEM Carrier part meeting exact factory W.C. calibration. Off-brand switches often carry ±0.05" W.C. tolerance, which can cause nuisance lockouts or — more dangerously — allow ignition under unsafe venting conditions.
• Install difficulty: 2/5 — Power down and confirm inducer has stopped before servicing. Tools needed: 1/4" nut driver, needle-nose pliers, manometer (for verification). Label and photograph tubing orientation before disconnecting. Inspect rubber hose for cracks while switch is out.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cut-off.

Compatibility: Fits Carrier PY4GPAB48115AA packaged units. Note that OEM part number HK06WC061 has been superseded by HK06MB061 — both are included with this listing. Compatible across Bryant and Payne models sharing the same 0.18" W.C. pressure switch specification. Always verify W.C. rating on your unit's data plate or existing switch before ordering. Our HVAC specialists are available to confirm fitment prior to purchase.