OEM Carrier Pressure Switch HK02ZB038 — 22#CLS / 7#OPN, 50" Leads for Model PH11JA036000AAAA

This OEM Carrier pressure switch (part number HK02ZB038) is the factory-specified replacement for the Carrier PH11JA036000AAAA packaged heat pump unit. The pressure switch monitors the inducer motor's draft pressure through a rubber hose connected to the flue or condensate system. When sufficient negative pressure is confirmed, the switch closes and signals the control board to proceed with the ignition sequence. A failed pressure switch will cause the system to lockout before ignition — often displaying a fault code — and the unit will refuse to fire even if all other components are functioning correctly.

• Specs: Close setpoint: 22" W.C. | Open setpoint: 7" W.C. | Lead length: 50" | OEM part number: HK02ZB038 | Cross-reference: PS80-02-F0074
• OEM vs Generic: This is the exact factory-matched pressure switch. OEM setpoints are calibrated to the precise draft requirements of the PH11JA036000AAAA inducer assembly. Aftermarket switches with loose W.C. tolerances can cause nuisance trips or, worse, fail to detect a true draft failure — a safety risk.
• Install difficulty: 2/5 — Disconnect power before servicing. Locate the inducer housing and identify the existing pressure switch. Disconnect the rubber hose and two wire terminals, then swap in the new switch. Tools needed: flathead screwdriver, needle-nose pliers, manometer (recommended for verification). Always check the hose for cracks or blockages before condemning the switch.
• Warranty: 1-year OEM manufacturer warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PH11JA036000AAAA packaged heat pump unit. Verify your unit's existing switch W.C. rating and lead length against your data plate before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order for peace of mind.