OEM Carrier Pressure Switch HK02ZB038 for Model PH10JA036000AGAA

This OEM pressure switch (part number HK02ZB038) is the factory-specified replacement for the Carrier PH10JA036000AGAA packaged heating unit. The pressure switch monitors the inducer motor's negative pressure to confirm that the heat exchanger is properly vented before allowing the ignition sequence to proceed. When this switch fails or drifts out of calibration, the control board receives no proof-of-draft signal and the system locks out before ignition — leaving you with a no-heat call. Common symptoms include the inducer running but the furnace never lighting, a pressure switch fault code on the control board, or the unit cycling off within the first 30 seconds of a heating call.

• Specs: Close setpoint 22" W.C. | Open setpoint 7" W.C. | 50" lead wire | Single-port design | Factory-matched sensitivity for reliable draft proving
• OEM vs Generic: This is a genuine Carrier OEM part manufactured to exact factory W.C. tolerances. Aftermarket pressure switches frequently ship with setpoint variance that causes nuisance lockouts or, worse, fails to protect against true venting failures — making OEM the only safe choice on a gas-fired appliance.
• Install difficulty: 2/5 — Turn off power and gas before servicing. Tools needed: 1/4" nut driver, flat-head screwdriver, and a manometer (recommended to verify static pressure after install). Disconnect the hose port and two wiring terminals, swap the switch, and confirm hose is free of condensate blockage before restart.
• Warranty: 1-year OEM factory warranty against manufacturing defects. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Designed for the Carrier PH10JA036000AGAA packaged gas/electric unit. Always verify the W.C. rating on your existing switch's label before ordering — multiple pressure switch ratings are used across the PH10JA series depending on configuration. Questions? Our HVAC parts specialists confirm fitment before you order — call or chat today.