OEM Carrier Pressure Switch HK02ZB038 for Model PY1PNA048080AEBA

This is the genuine OEM replacement pressure switch (part number HK02ZB038) for the Carrier PY1PNA048080AEBA furnace. The pressure switch is a critical safety component that monitors negative pressure created by the inducer motor to confirm proper draft before allowing the ignition sequence to proceed. When this switch fails or sticks open, the control board interprets it as a draft fault and locks out the furnace — leaving you with no heat, a blinking fault code, and a cold house. Common symptoms of a failed pressure switch include the furnace never advancing past the inducer stage, repeated lockout codes, or intermittent heating that cuts out before a full cycle completes.

• Specs: Opens at 7" W.C. | Closes at 22" W.C. | 50" wire leads | Factory-matched OEM setpoints for precise draft proving
• OEM vs Generic: This is a genuine Carrier OEM part with calibrated W.C. setpoints matched to the inducer and heat exchanger design of the PY1PNA048080AEBA. Aftermarket pressure switches often use broader tolerance ratings that can cause nuisance trips or — worse — fail to detect a true draft fault, creating a safety risk.
• Install Difficulty: 2/5 — Disconnect power before servicing. Tools needed: 1/4" hex driver, flathead screwdriver, and a manometer if verifying inducer pressure. Photograph hose and wiring connections before removal. Ensure the rubber hose port is clear of condensate before reconnecting.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed and factory-specified for the Carrier PY1PNA048080AEBA furnace. Replaces OEM part number HK02ZB038 (also cross-referenced as PS80-02-F0074). Verify your existing switch's W.C. rating on the label before ordering to ensure an exact match. Have a question about fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today and ship with confidence.