OEM Carrier High & Low Pressure Switch for Model CH14NA01800GAAAA

These OEM pressure switches are the factory-specified replacements for the Carrier CH14NA01800GAAAA split-system heat pump. The pressure switch monitors refrigerant pressure on both the high and low sides of the refrigerant circuit, protecting the compressor from operating outside safe pressure limits. When either switch fails or trips, the system will lock out, preventing startup entirely — a common symptom misdiagnosed as a compressor or control board failure. Two OEM part numbers apply: 312926-252 (High Pressure Switch) and 312926-258 (Low Pressure Switch).

• Specs: Part 312926-252 — High Pressure Switch | Part 312926-258 — Low Pressure Switch | Normally closed contacts | Factory-calibrated cut-out pressure settings | Direct OEM replacement for Carrier CH14NA01800GAAAA heat pump condensers
• OEM vs Generic: OEM pressure switches are calibrated to exact factory cut-out and cut-in pressure thresholds. Aftermarket substitutes often carry wider tolerances, risking nuisance trips or, more critically, failure to protect the compressor from damaging over- or under-pressure conditions.
• Install difficulty: 3/5 — Refrigerant system work must be performed by an EPA Section 608 certified technician. Tools needed: manifold gauge set, multimeter, adjustable wrench, refrigerant recovery equipment. Always recover refrigerant before replacing pressure switches on a live system.
• Warranty: 1-year OEM factory warranty on both switches. Orders placed before 3 PM ship same business day from our climate-controlled warehouse.

Compatibility: Engineered specifically for the Carrier CH14NA01800GAAAA heat pump condenser. Confirm your existing switch part number (312926-252 for high side or 312926-258 for low side) against your unit's wiring diagram or data plate before ordering. Not sure which switch you need? Our HVAC parts specialists can verify fitment — contact us before you order.