OEM Carrier High & Low Pressure Switch for Model CH14NB02400GBAAA

These OEM pressure switches — 312926-252 (High Pressure Switch) and 312926-258 (Low Pressure Switch) — are the factory-specified replacements for the Carrier CH14NB02400GBAAA condensing unit. Pressure switches prove that the inducer motor has established adequate draft before allowing the gas valve to open. A failed pressure switch is one of the most common causes of a furnace or heat pump system that locks out before ignition, with the inducer running but the unit never advancing to the heat stage. Symptoms include a blinking fault code indicating an open pressure switch circuit, the system cycling on and off repeatedly, or a complete no-heat condition with the inducer motor still operating normally.

• Specs: 312926-252 — High Pressure Switch | 312926-258 — Low Pressure Switch | Factory-calibrated W.C. (water column) trip point | OEM-matched hose barb and electrical connector fitment for direct plug-in replacement
• OEM vs Generic: OEM pressure switches are factory-calibrated to the exact W.C. rating required by this model. Generic substitutes frequently carry wider tolerances that can cause nuisance lockouts in cold weather or, worse, fail to open on a true blocked-flue condition — a potential safety hazard.
• Install Difficulty: 2/5 — Disconnect power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers. Inspect the rubber pressure hose for cracks or blockages before installing the new switch, as a compromised hose will cause the new switch to fail immediately. Photograph hose routing and wiring prior to removal.
• Warranty: 1-year OEM factory warranty. Orders placed by 3 PM EST ship same business day from our warehouse.

Compatibility: Designed specifically for the Carrier CH14NB02400GBAAA condensing unit. Two separate switches are listed — order 312926-252 for the high pressure switch or 312926-258 for the low pressure switch. Verify the faulty switch against your unit's diagnostic fault code and wiring diagram before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before every order.