OEM Carrier High & Low Pressure Switch Kit — 312926-252 & 312926-258 for PH15NB03600GBBAA

These two OEM pressure switches are the factory-specified replacements for the Carrier PH15NB03600GBBAA heat pump system. The high pressure switch (312926-252) trips at 670 PSI and resets at 470 PSI, cutting power to the compressor before dangerously elevated refrigerant pressure can cause catastrophic system failure. The low pressure switch (312926-258) monitors the suction side of the refrigerant circuit, shutting the compressor down if pressure drops too low — a common indicator of refrigerant loss, a blocked filter drier, or an iced evaporator coil. When either switch fails or trips without resetting, the result is a compressor that won't run, short-cycling, or a system locked out entirely.

• Part Numbers: 312926-252 (High Pressure Switch, 670/470 PSI) | 312926-258 (Low Pressure Switch) — both are genuine Carrier OEM components, factory-matched to the PH15NB03600GBBAA refrigerant circuit.
• OEM vs Generic: OEM switches are calibrated to exact cut-out and cut-in pressure thresholds specified by Carrier engineering. Aftermarket units often carry wider tolerances, risking nuisance trips or, worse, failure to protect the compressor under actual fault conditions.
• Install Difficulty: 3/5 — Refrigerant system work requires an EPA 608 certification. Tools needed: manifold gauge set, adjustable wrenches, wire terminals, multimeter. Always recover refrigerant before accessing the high-side circuit. Verify switch continuity with a multimeter before condemning the part.
• Warranty: 1-year OEM manufacturer warranty. Orders placed before 3 PM ship the same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier PH15NB03600GBBAA heat pump. Confirm your unit's refrigerant type and pressure ratings on the data plate before ordering. Our parts specialists are available to verify fitment — contact us before you buy if you have any questions. In stock and ships today.