OEM Carrier High & Low Pressure Switch HK02ZA395 / HK02ZB044 for Model PH1ZNA024000ABAA

This OEM pressure switch kit contains both the high pressure switch (HK02ZA395) and the low pressure switch (HK02ZB044) — the factory-specified replacements for the Carrier PH1ZNA024000ABAA heat pump system. These switches continuously monitor refrigerant-side pressures to protect the compressor from catastrophic high-side over-pressure and low-side loss-of-charge conditions. When either switch fails or trips without resetting, the system will go into protective lockout, displaying a fault code and refusing to run cooling or heating cycles until the fault is cleared.

• Specs — High Pressure Switch (HK02ZA395): Opens at 395 PSI | Closes at 295 PSI | 1/8" NPT thread | 240 VAC | Sensata PS80-03-0018 platform | Replaces: 312926-217, HK02ZA380, HK02ZA396, HK02ZA400, HK02ZA401
• Specs — Low Pressure Switch (HK02ZB044): Opens at 7 PSI | Closes at 22 PSI | 50" lead wire | 24V | OEM Carrier RCD | Factory-matched cut-in/cut-out thresholds for PH1ZNA024000ABAA refrigerant circuit
• OEM vs Generic: OEM pressure switches are calibrated to exact factory trip points. Aftermarket substitutes frequently carry ±10–15% pressure tolerances, risking nuisance trips or, worse, failure to protect the compressor under genuine fault conditions — potentially voiding equipment warranties.
• Install difficulty: 3/5 — System must be recovered and de-pressurized before replacing the high-side switch. Low-side switch swap is straightforward with basic hand tools. Tools needed: refrigerant manifold gauges, 1/8" NPT fitting wrench, wire crimpers, multimeter. Always verify both switches with a multimeter for continuity before condemning the board.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse on all in-stock orders.

Compatibility: Engineered as direct OEM replacements for the Carrier PH1ZNA024000ABAA heat pump. Verify refrigerant type and system tonnage on your data plate before ordering. Have a question about fitment? Our HVAC parts specialists verify compatibility before you buy — reach out via chat or phone today.