OEM Carrier High & Low Pressure Switch Kit 312926-252 / 312926-258 for Model PH14NA036000BAAA

This listing includes both factory-specified OEM refrigerant pressure switches for the Carrier PH14NA036000BAAA heat pump: the 312926-252 High Pressure Switch (670/470 PSI) and the 312926-258 Low Pressure Switch (55/23 PSI). Together, these switches continuously monitor refrigerant circuit pressure and interrupt compressor operation the instant pressure leaves the safe operating window — protecting the compressor from catastrophic failure caused by overcharge, undercharge, blocked airflow, or refrigerant loss. When either switch fails or trips without resetting, you'll typically experience nuisance lockouts, a system that shuts off seconds after startup, fault codes on the thermostat, or a compressor that refuses to energize at all.

• High Pressure Switch (312926-252): Cuts out at 670 PSI / resets at 470 PSI — protects against overcharge, condenser blockage, and high ambient conditions. Manual-reset safety device.
• Low Pressure Switch (312926-258): Cuts out at 23 PSI / resets at 55 PSI — protects against refrigerant undercharge, evaporator freeze, and restricted airflow. Auto-reset safety device.
• OEM vs Generic: Carrier Factory Authorized Parts (FAP) are manufactured to exact cut-in/cut-out tolerances. Aftermarket pressure switches often carry ±5–10% pressure tolerances, risking nuisance trips or — worse — failing to protect the compressor when it matters most.
• Install difficulty: 3/5 — System must be recovered and de-pressurized before replacing refrigerant-side switches. Tools required: manifold gauge set, refrigerant recovery machine, Schrader valve core tool, multimeter. EPA 608 certification required. Always verify the switch is the fault source with a manifold gauge before ordering.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Both switches are factory-matched replacements for the Carrier PH14NA036000BAAA single-stage R-410A residential heat pump. Verify existing switch cut-out ratings on your unit's wiring diagram before ordering. Need help confirming fitment? Our HVAC parts specialists are available to verify compatibility before you buy — no guesswork required. Order now and ship today.