OEM Carrier High & Low Pressure Switch Kit (312926-252 / 312926-258) for Model PH15NB03000GBAAA

This OEM pressure switch kit includes both the high-pressure switch (312926-252, 670/470 PSI) and the low-pressure switch (312926-258) — the two factory-specified refrigerant safety controls for the Carrier PH15NB03000GBAAA heat pump. These switches continuously monitor system refrigerant pressure and send a signal to the control board to shut down the compressor if pressure falls outside safe operating limits. A failed high-pressure switch typically causes nuisance lockout on hot days or after refrigerant overcharge; a failed low-pressure switch causes shutdown during low ambient operation or after a refrigerant leak. Both conditions present as a system that starts and then immediately trips off — often with a fault code pointing to high- or low-pressure lockout.

• Specs — High Pressure Switch (312926-252): Cut-out 670 PSI | Reset 470 PSI | SPST normally closed | Factory-calibrated setpoints | OEM part for Carrier PH15NB03000GBAAA
• Specs — Low Pressure Switch (312926-258): Factory-matched cut-in/cut-out setpoints | SPST normally closed | Designed to work in tandem with 312926-252 on the same refrigerant circuit
• OEM vs Generic: Genuine Carrier OEM switches are calibrated to exact factory PSI setpoints. Off-brand alternatives often carry ±5–10% pressure tolerance variation, which can allow unsafe operating pressures that void compressor warranties and risk system damage.
• Install difficulty: 3/5 — Requires EPA 608 certification to handle refrigerant. Tools needed: manifold gauge set, adjustable wrench, wire connectors, multimeter. Always recover refrigerant before replacing switches on the high-side port. Photograph all wiring before disconnection.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered as factory replacements for the Carrier PH15NB03000GBAAA heat pump. Verify your unit's existing switch PSI ratings against the data plate before ordering — some production variants may use alternate setpoint switches. Our fitment team is available to confirm compatibility before you buy. Order today and receive same-day shipping on in-stock inventory.