OEM Carrier High & Low Pressure Switch Kit HK02ZA395 / HK02ZB038 for Model PH10JA04200GACAA

This OEM pressure switch kit includes both the high pressure switch (HK02ZA395) and the low pressure switch (HK02ZB038) — the factory-specified refrigerant safety switches for the Carrier PH10JA04200GACAA packaged heat pump unit. These switches monitor refrigerant pressure on both the high and low sides of the refrigerant circuit. When either switch detects an out-of-range condition, it opens the control circuit to protect the compressor from catastrophic damage. A failed or nuisance-tripping pressure switch typically causes the system to lock out, short-cycle, or refuse to cool/heat entirely — symptoms that can be misdiagnosed as compressor or control board failures.

• Specs — High Pressure Switch (HK02ZA395): Opens at 395 PSI | Closes at 295 PSI | 6(6)A | 240 VAC | 1/8" NPT thread | Sensata PS80 platform | PMAX 41B rated
• Specs — Low Pressure Switch (HK02ZB038): Opens at 7 PSI | Closes at 22 PSI | 50" leads | OEM Carrier Pressurestat | Sensata PS80 platform
• OEM vs Generic: These OEM Carrier switches are factory-calibrated to exact cut-in and cut-out pressures. Generic aftermarket switches frequently carry ±5–10% pressure tolerances, which can result in nuisance trips or, worse, failure to protect the compressor under genuine fault conditions. Always use OEM on refrigerant safety circuits.
• Install difficulty: 3/5 — Refrigerant pressure switches are in the live refrigerant circuit. Do NOT open refrigerant lines. Switches are typically wired into the low-voltage control circuit (24V) and can be swapped with the system pumped down. Tools needed: needle-nose pliers, 1/4" nut driver, multimeter, manifold gauge set for verification. EPA 608 certification required if refrigerant must be recovered. Photograph all wiring before disconnecting.
• Warranty: 1-year OEM factory warranty against manufacturing defects. Ships same business day from our warehouse.

Compatibility: Engineered as the direct OEM replacement for Carrier model PH10JA04200GACAA packaged heat pump units. Always verify refrigerant type and system operating pressures against your unit's data plate before installation. Our HVAC parts specialists are available to confirm fitment before you order — call or chat today. In stock and ships today.