OEM Carrier Draft Pressure Switch 0.18" WC for Model PY4GNAB60130NA

This OEM Carrier draft pressure proving switch (part number HK06WC061, superseded by HK06MB061) is the factory-specified replacement for the Carrier PY4GNAB60130NA packaged unit. The pressure switch monitors negative pressure created by the inducer motor to confirm proper venting before allowing ignition to proceed. When it fails or sticks, the control board never receives the "all clear" signal — resulting in a no-heat lockout before a single ignition attempt is made. Symptoms include a blinking error code for pressure switch fault, an inducer that runs but ignition that never follows, or intermittent heating that stops during cold weather when flue pressure margins are tightest.

• Specs: 0.18" W.C. (water column) setpoint | Single-port draft pressure switch | Honeywell OEM-equivalent (IS20224-5236) | Compatible with 24V control circuit | Current Carrier part: HK06MB061
• OEM vs Generic: OEM switches are factory-calibrated to exact W.C. tolerances. Off-spec generic switches can trip too early or too late — masking real venting problems or causing nuisance lockouts that damage heat exchangers over time.
• Install difficulty: 2/5 — Power off the unit at the disconnect before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, needle-nose pliers. Photograph existing tubing routing before disconnecting. Inspect inducer hose for cracks or blockages while the switch is out.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY4GNAB60130NA packaged gas/electric unit. Also fits select Bryant and Payne models sharing this pressure switch specification. Always verify the 0.18" W.C. rating on your existing switch before ordering. Have a question about fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today and get your system back up and running fast.