OEM Carrier High Pressure Switch HK02ZA442 / HK02ZB044 for Model PY1RJA060115AAWB

This OEM high pressure switch (HK02ZA442) is the factory-authorized replacement for the Carrier PY1RJA060115AAWB packaged rooftop unit. The high pressure switch monitors refrigerant pressure on the discharge side of the compressor and opens the control circuit when pressure exceeds safe limits, preventing compressor damage. A failed or out-of-tolerance pressure switch typically presents as nuisance high-pressure lockouts, compressor fault codes at startup, or a system that trips out on a warm day without an apparent refrigerant issue. The companion low pressure switch HK02ZB044 is also available — both are listed under this product for your convenience.

• Specs (HK02ZA442 — High Pressure Switch): 448 PSI opening pressure | 327 PSI closing pressure | OEM factory-matched setpoints | Replaces HK02ZA439
• Specs (HK02ZB044 — Low Pressure Switch): 7 PSI opening pressure | 22 PSI closing pressure | 50" leads | 24V rated | Country of origin: Mexico
• OEM vs Generic: Factory Authorized Parts are engineered to exact Carrier Corporation pressure setpoint specifications. Off-brand switches frequently drift in setpoint calibration, causing nuisance trips or — worse — failing to protect the compressor at true high-pressure events.
• Install difficulty: 2/5 — Recover refrigerant charge before replacing the high pressure switch on the high side. Tools needed: manifold gauge set, adjustable wrench, wire stripper, multimeter. Low-pressure switch replacement is simpler: de-energize the unit, photograph wiring, unplug leads, and swap the switch body. Always verify setpoints match the data plate before ordering.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse.

Compatibility: Engineered for the Carrier PY1RJA060115AAWB packaged rooftop unit. Confirm part number HK02ZA442 (high pressure) or HK02ZB044 (low pressure) against your unit's wiring diagram or data plate before ordering. Need help verifying fitment? Our HVAC parts specialists confirm compatibility before you buy — call or chat today and get your unit back online fast.