OEM Carrier High Pressure Switch HK02ZA442 / HK02ZB044 for Model PY1RJA036074ABWA

This OEM high pressure switch is the factory-specified replacement for the Carrier PY1RJA036074ABWA. The pressure switch proves that the draft inducer is operating correctly before the control board allows ignition to proceed. When the switch fails — either stuck open or failing to close — the furnace will lockout before reaching the ignition stage, leaving you with no heat. A faulty pressure switch is one of the most common causes of furnace no-heat calls and diagnostic error codes.

• Specs: OEM Part Numbers: HK02ZA442 (High Pressure Switch) & HK02ZB044 (Pressure Switch) | 24V coil voltage | 7 PSI open / 22 PSI close | 50" lead length | Cut-In Temp: 7 | Cut-Out Temp: 22 | Country of Origin: Mexico
• OEM vs Generic: This is a genuine Carrier OEM part — factory-calibrated to exact pressure thresholds. Aftermarket switches often carry wider tolerances that can cause nuisance lockouts or, worse, unsafe ignition timing. OEM is always the recommended choice for pressure-critical safety components.
• Install difficulty: 2/5 — Shut off power and gas supply before starting. Tools needed: flat-head screwdriver, needle-nose pliers, and a manometer or magnehelic gauge to verify inducer pressure if diagnosing. Always confirm the inducer motor is functioning before replacing the switch, as a failed inducer is often the root cause of pressure switch faults.
• Warranty: 1-year OEM factory warranty. In-stock orders ship same business day from our warehouse.

Compatibility: Designed for the Carrier PY1RJA036074ABWA. This listing covers both OEM part numbers HK02ZA442 and HK02ZB044 — verify your existing part number against your unit's wiring diagram or data plate before ordering. Questions about fitment? Our HVAC parts specialists verify compatibility before you buy — call or chat today.