OEM Carrier Pressure Switch HK02ZB038 for Model PH10JA036000AAAA

This OEM pressure switch (part number HK02ZB038) is the factory-specified replacement for the Carrier PH10JA036000AAAA packaged heating unit. The pressure switch is a critical safety component that monitors negative pressure produced by the inducer motor to confirm proper venting before allowing the ignition sequence to proceed. When this switch fails or sticks, the control board cannot verify draft, and the unit will lock out on a pressure switch fault — resulting in a no-heat condition with no ignition attempt.

• Specs: Closes at 22" W.C. | Opens at 7" W.C. | 50" lead wire | Single-port design | Factory-calibrated setpoints — no field adjustment required
• OEM vs Generic: This is a genuine Carrier OEM switch, calibrated to exact factory W.C. setpoints. Aftermarket switches frequently carry ±10–15% pressure tolerance, risking nuisance lockouts or, worse, masking a real venting fault and allowing unsafe operation.
• Install difficulty: 2/5 — Disconnect power before servicing. Tools needed: 1/4" nut driver, needle-nose pliers, and a manometer if verifying inducer draft post-install. Photograph hose routing and wiring connections before removal. Swap the pressure hose and spade connectors directly to the new switch.
• Warranty: 1-year OEM factory warranty against manufacturing defects. Ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PH10JA036000AAAA packaged gas/electric unit. Cross-references: PS80-02-F0074. Always verify the W.C. rating on your existing switch's label before ordering to confirm fitment. Have a question? Our HVAC parts specialists verify fitment before you buy — order now and receive same-day shipping.