OEM Carrier High Pressure Switch 395/295 PSI for Model PH1PNA036000AABA

This genuine OEM high pressure switch (part number HK02ZA395) is the factory-specified refrigerant safety switch for the Carrier PH1PNA036000AABA packaged heat pump unit. Mounted in the high-side refrigerant circuit, it continuously monitors system discharge pressure and opens the safety circuit at 395 PSI, cutting power to the compressor before a dangerous over-pressure condition can cause catastrophic failure. The switch automatically resets when pressure drops back to 295 PSI. When this switch fails or trips repeatedly, symptoms include sudden compressor shutdown, high-pressure fault codes on the control board, and the system locking out after each cooling or heating cycle.

• Specs: Opens at 395 PSI | Closes at 295 PSI | 1/8" NPT male fitting | 240 VAC rated | SPST normally-closed | Sensata PS80-03-0018 platform | Replaces HK02ZA380, HK02ZA396, HK02ZA400, HK02ZA401, 312926-217, 71267D1
• OEM vs Generic: This is a genuine Carrier OEM component manufactured to exact factory pressure setpoints. Generic aftermarket switches frequently have ±5–10% PSI tolerance variance, which can allow the compressor to operate in an unsafe pressure range or cause nuisance trips that damage the refrigerant circuit over time.
• Install difficulty: 3/5 — Refrigerant system access required. The system must be properly recovered before disconnecting the switch from the high-side port. Tools needed: manifold gauge set, refrigerant recovery equipment, adjustable wrench, PTFE/refrigerant-rated thread sealant, and a multimeter to confirm switch continuity before re-commissioning. Always photograph wiring connections prior to removal.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Engineered as a direct OEM replacement for Carrier model PH1PNA036000AABA. Cross-references: 312926-217, 71267D1, HK02ZA380, HK02ZA396, 19240027, HK02ZA400, 312926-225, 312926-226, 312926-233, HK02ZA401, HK02ZA435, HK02ZA500, HK02ZA501. Always verify your unit's data plate and existing switch PSI markings before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order.