OEM Carrier High & Low Pressure Switch Kit (312926-252 / 312926-258) for Model PH13NB036000ABAA

These are the factory-specified OEM high and low pressure switches for the Carrier PH13NB036000ABAA heat pump system. The high pressure switch (312926-252, rated 670/470 PSI cut-out/cut-in) and low pressure switch (312926-258) work as a matched safety pair — monitoring refrigerant pressure on both the high and low sides of the refrigerant circuit. When either switch detects pressure outside the safe operating window, it signals the control board to shut down the compressor, protecting the system from catastrophic failure. Common failure symptoms include nuisance tripping, fault codes indicating high or low pressure lockout, compressor short-cycling, or a system that runs briefly then shuts off without reaching setpoint.

• Specs: High Pressure Switch 312926-252 — 670 PSI cut-out / 470 PSI cut-in | Low Pressure Switch 312926-258 — matched factory calibration | Genuine Carrier OEM components | Certified to EN12263 / EN60730-2-6 safety standards
• OEM vs Generic: OEM pressure switches are factory-calibrated to exact cut-out and cut-in thresholds for the PH13NB036000ABAA refrigerant circuit. Aftermarket switches frequently carry wider pressure tolerances, risking either nuisance trips or — more dangerously — failing to protect the compressor from over-pressurization.
• Install difficulty: 3/5 — Refrigerant circuit work must be performed by an EPA Section 608-certified technician. Tools required: manifold gauge set, torque wrench, flare-nut wrenches, multimeter for continuity verification. Always recover refrigerant per EPA regulations before opening the system. Photograph all wiring before disconnecting.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse on orders placed before 3 PM local time.

Compatibility: Engineered as a direct OEM replacement for the Carrier PH13NB036000ABAA heat pump. Verify your unit's data plate refrigerant type and confirm both OEM part numbers (312926-252 and 312926-258) against your service manual before ordering. Not sure if this is the right part? Our HVAC parts specialists verify fitment before you buy — contact us today and ship the same day.