OEM Carrier Pressure Switch (High & Low) for Model CH14NB01800GAAAA

These OEM pressure switches — 312926-252 (High Pressure Switch) and 312926-258 (Low Pressure Switch) — are the factory-specified replacements for the Carrier CH14NB01800GAAAA condensing unit. The pressure switch monitors the inducer motor's draft pressure to confirm safe venting conditions before allowing the ignition sequence to proceed. A failed pressure switch is one of the most common causes of a furnace or heat pump that locks out before ignition, often triggering a fault code indicating "pressure switch stuck open" or "pressure switch stuck closed." Symptoms include a system that attempts to start, runs the inducer briefly, then shuts down without ever reaching the ignition stage.

• Specs: Includes both High Pressure Switch (OEM Part 312926-252) and Low Pressure Switch (OEM Part 312926-258) | Factory-calibrated W.C. (water column) rating | SPST normally-open configuration | Direct OEM replacement with matched pressure set points
• OEM vs Generic: OEM pressure switches are factory-calibrated to the exact water column rating required by the CH14NB01800GAAAA. Generic alternatives often use broader pressure tolerances, risking nuisance lockouts or — more dangerously — failure to detect true venting problems, creating a potential safety hazard.
• Install difficulty: 3/5 — Requires shutting off power at the disconnect and gas supply before beginning work. Tools needed: flathead and Phillips screwdrivers, 1/4" nut driver, needle-nose pliers, and a manometer to verify W.C. rating if diagnosing before replacement. Always inspect the rubber pressure tubing for cracks or blockages before condemning the switch itself.
• Warranty: 1-year OEM factory warranty on both switches. Orders placed before cutoff ship the same business day from our stocked warehouse.

Compatibility: Both switches are designed specifically for the Carrier CH14NB01800GAAAA condensing unit. Confirm OEM part numbers 312926-252 and 312926-258 against your unit's wiring diagram or data plate before ordering. Not sure which switch you need? Our HVAC parts specialists can verify fitment and help you identify the failed component — contact us before you order.