OEM Carrier High Pressure Switch HK02ZA395 / HK02ZB044 for Model PH1PEB036000AAAA

This genuine OEM Carrier high pressure safety switch is the factory-specified replacement for the Carrier PH1PEB036000AAAA heat pump system. The high pressure switch (HK02ZA395) monitors refrigerant pressure on the high side of the refrigerant circuit and acts as a critical safety device — cutting power to the compressor if system pressure exceeds safe operating limits. When it fails or sticks open, the result is a nuisance lockout, a system that won't cool or heat, or a compressor that trips on first start. The companion low pressure switch HK02ZB044 (opens at 7 PSI, closes at 22 PSI) is also listed here and protects against low-side refrigerant loss events such as leaks or severe undercharge.

• Primary Part (High Pressure): HK02ZA395 | Opens at 395 PSI | Closes at 295 PSI | 240 VAC rated | 1/8" NPT thread | Sensata PS80-03-0018 | Factory tolerance matched for R-410A systems
• Secondary Part (Low Pressure): HK02ZB044 | Opens at 7 PSI | Closes at 22 PSI | 24V | 50" lead length | Direct OEM drop-in replacement
• OEM vs Generic: OEM pressure switches are calibrated to exact factory cut-in/cut-out set points. Aftermarket switches frequently deviate from set-point specs, risking either nuisance lockouts or — more critically — failure to protect the compressor at high pressure extremes, leading to catastrophic compressor failure.
• Install difficulty: 3/5 — Requires EPA 608 certification to work on the refrigerant circuit. Always recover refrigerant before replacing the high-pressure switch if it is wet-side mounted. Tools needed: manifold gauge set, refrigerant recovery unit, adjustable wrench, thread sealant. Verify the system is de-energized before disconnecting any wiring. Photograph all wiring and tubing connections before removal.
• Warranty: 1-year OEM factory warranty on both HK02ZA395 and HK02ZB044. Ships same business day from our warehouse when ordered by 3 PM local time.

Compatibility: Designed for the Carrier PH1PEB036000AAAA packaged heat pump unit. Cross-references for HK02ZA395 include: 312926-217, 71267D1, HK02ZA380, HK02ZA396, 19240027, HK02ZA400, 312926-225, 312926-226, HK02ZA401, HK02ZA435, HK02ZA500, HK02ZA501. Always confirm refrigerant type and system operating pressures against your unit's data plate before ordering. Our HVAC parts specialists are available to verify fitment — contact us before you order if you have any questions.