OEM Carrier Pressure Switch HK02ZB038 for Model PY1PEA048100AGBA

This is the factory OEM replacement pressure switch (part number HK02ZB038) for the Carrier PY1PEA048100AGBA packaged unit. The pressure switch monitors inducer draft pressure to confirm the heat exchanger is properly venting before allowing ignition. When this switch fails, the control board receives no confirmation signal and the system locks out — resulting in a no-heat condition, a flashing fault code, or a system that runs the inducer motor continuously without progressing to the ignition stage.

• Specs: Closes at 22" W.C. | Opens at 7" W.C. | 50" wire leads | Single-port design | Factory-calibrated setpoints
• OEM vs Generic: This OEM switch ships with exact factory-calibrated trip points (±0.1" W.C.). Aftermarket substitutes often carry wider tolerances, causing nuisance lockouts or — worse — allowing ignition under unsafe draft conditions.
• Install difficulty: 2/5 — Shut off power and gas before servicing. Tools needed: 1/4" nut driver, needle-nose pliers, and a manometer to verify draft pressure after installation. Photograph wiring and hose routing before disconnecting the old switch.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Direct OEM replacement for Carrier model PY1PEA048100AGBA packaged units. Always verify your unit's existing switch W.C. rating and lead length against your data plate before ordering. Our technical team is available to confirm fitment — reach out before you buy if you have any questions.