OEM Carrier High & Low Pressure Switch Kit 670-470# for Model PH13NB030000AAAA

This OEM pressure switch kit includes both the high pressure switch (312926-252) and low pressure switch (312926-258) — the factory-specified refrigerant safety controls for the Carrier PH13NB030000AAAA heat pump system. These switches continuously monitor refrigerant circuit pressure and cut power to the compressor the moment pressure moves outside the safe operating envelope. A failed high pressure switch typically presents as nuisance compressor trips or a system that short-cycles and locks out on a high-pressure fault. A failed low pressure switch causes the compressor to shut down prematurely or prevents it from starting altogether, often mimicking a refrigerant-loss symptom even when charge is adequate.

• Specs: High Pressure Switch 312926-252 — 670 PSI cut-out / 470 PSI cut-in | Low Pressure Switch 312926-258 — factory-matched refrigerant pressure thresholds | SPST normally-closed contacts | Designed for R-410A refrigerant circuit
• OEM vs Generic: OEM Carrier switches are calibrated to exact factory cut-in/cut-out pressures. Off-brand switches frequently drift in setpoint, allowing dangerous over- or under-pressure conditions that shorten compressor life or void equipment warranties.
• Install difficulty: 3/5 — Refrigerant circuit work requires an EPA 608 certified technician. Tools needed: manifold gauge set, adjustable wrench, leak-detection solution. Always recover refrigerant before opening the high-side circuit. Photograph all wiring before disconnection.
• Warranty: 1-year OEM manufacturer warranty. Orders placed before 5 PM EST ship the same business day from our warehouse.

Compatibility: Factory-matched for the Carrier PH13NB030000AAAA heat pump. Always verify OEM part numbers 312926-252 (high) and 312926-258 (low) against your unit's data plate and wiring diagram before installation. Have questions about fitment? Our HVAC parts specialists verify compatibility before you order — contact us today.