OEM Carrier High & Low Pressure Switch Kit — HK02ZA395 + HK02ZB044 — for Model PH2PNB024000AB

This OEM pressure switch kit includes both the high pressure switch (HK02ZA395) and the low pressure switch (HK02ZB044) — the exact factory-specified pair for the Carrier PH2PNB024000AB heat pump. These switches act as safety sentinels in the refrigerant circuit: the high-side switch opens at 395 PSI and resets at 295 PSI, while the low-side switch opens at 7 PSI and closes at 22 PSI with a 50-inch lead. When either switch fails or trips, the system will lock out on a fault code, short-cycle, or refuse to start entirely — symptoms often misdiagnosed as compressor or control board failure.

• Specs — HK02ZA395 (High Pressure): Open @ 395 PSI | Close @ 295 PSI | 1/8" NPT thread | 240 VAC | PMAX 41B | Replaces: 312926-217, HK02ZA380, HK02ZA396, HK02ZA400, HK02ZA401, HK02ZA435, HK02ZA500, HK02ZA501
• Specs — HK02ZB044 (Low Pressure): Open @ 7 PSI | Close @ 22 PSI | 50" lead | 24V | Country of Origin: Mexico | Genuine OEM Carrier/Bryant/Payne part
• OEM vs Generic: OEM pressure switches are factory-calibrated to exact cut-in and cut-out tolerances. Aftermarket substitutes frequently drift out of spec, causing nuisance trips or — more dangerously — failing to protect the compressor from refrigerant overcharge or loss-of-charge events.
• Install difficulty: 2/5 — Recover refrigerant per EPA 608 before replacing the high-side switch. Tools: manifold gauge set, 1/8" NPT fittings, spanner wrench, multimeter to verify continuity post-install. Always confirm system pressures are within normal operating range before closing up. Low-side switch is a straightforward swap with no refrigerant recovery required on most configurations.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered by 3PM local time.

Compatibility: Engineered as a direct OEM replacement for the Carrier PH2PNB024000AB heat pump. Verify model data plate and existing switch PSI ratings before ordering. Not sure? Our fitment team confirms compatibility before you buy — reach out via chat or phone.