OEM Carrier High & Low Pressure Switch Set HK02ZA395 + HK02ZB044 for Model PH1ZPA036000AAAA

This factory-matched OEM pressure switch kit includes both the high pressure switch (HK02ZA395) and low pressure switch (HK02ZB044) designed as direct replacements for the Carrier PH1ZPA036000AAAA packaged heat pump unit. Pressure switches are critical safety devices that monitor refrigerant pressure and shut the system down before compressor damage can occur. When either switch fails — or trips and won't reset — the result is a system that locks out, won't start, or short-cycles within seconds of calling for cooling or heating.

• Specs — HK02ZA395 (High Pressure Switch): Opens at 395 PSI | Closes at 295 PSI | 240 VAC | 1/8" NPT thread | Replaces 312926-217, HK02ZA380, HK02ZA396, and other legacy Carrier part numbers
• Specs — HK02ZB044 (Low Pressure Switch): Opens at 7 PSI | Closes at 22 PSI | 24V | 50" lead wire | OEM Carrier/Bryant/Payne application
• OEM vs Generic: OEM pressure switches are calibrated to exact factory trip points. Aftermarket alternatives often carry wider tolerances that can allow damaging over- or under-pressure conditions to go undetected, shortening compressor life significantly.
• Install difficulty: 2/5 — Recover refrigerant before accessing the refrigerant circuit side. De-energize the unit at the disconnect before any work. Tools needed: refrigerant recovery machine, manifold gauges, 1/4" nut driver, needle-nose pliers. Always photograph existing wiring before disconnecting leads. Verify trip-point markings match your unit's data plate before installation.
• Warranty: 1-year OEM factory warranty on both switches. Orders ship same business day from our warehouse when placed before cutoff.

Compatibility: This kit is the OEM-specified replacement for Carrier model PH1ZPA036000AAAA packaged heat pump units. Confirm both part numbers against your unit's wiring diagram and data plate before ordering. Not sure? Our HVAC parts specialists verify fitment before you purchase — reach out via chat or phone.