OEM Carrier Pressure Switch HK02ZB038 for Model PY1PNA036100ADBA

This is the factory OEM replacement pressure switch for the Carrier PY1PNA036100ADBA packaged unit. The pressure switch monitors the operation of the inducer motor by sensing negative air pressure through a rubber hose connected to the inducer housing. When the inducer achieves proper draft, the switch closes and signals the control board to proceed with ignition. A failed pressure switch causes the system to lock out before the ignition sequence ever begins — the inducer runs, but the furnace never lights, leaving you with no heat.

• Specs: Closes at 22" W.C. | Opens at 7" W.C. | 50" lead wire | OEM part number HK02ZB038 | Factory-matched actuation thresholds for reliable draft proving
• OEM vs Generic: This is a genuine Carrier OEM switch, not an aftermarket substitute. OEM pressure switches are calibrated to exact W.C. thresholds; off-tolerance generic switches can cause nuisance lockouts or, worse, allow ignition under unsafe draft conditions.
• Install difficulty: 2/5 — Standard hand tools required: 1/4" nut driver, needle-nose pliers. Disconnect power before servicing. Always inspect the pressure hose for cracks, moisture, or blockage before condemning the switch — a clogged hose is a common misdiagnosis.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for Carrier model PY1PNA036100ADBA. Verify the W.C. rating on your unit's existing switch before ordering to confirm fitment. Our HVAC parts specialists are available to verify compatibility before you buy — call or chat today. In stock — ships today.