OEM Carrier High & Low Pressure Switch for Model CH14NA04800GAAAA

These OEM pressure switches — 312926-252 (High Pressure Switch) and 312926-258 (Low Pressure Switch) — are the factory-specified replacements for the Carrier CH14NA04800GAAAA condensing unit. Pressure switches monitor the inducer motor's draft pressure via a rubber hose connected to the flue or collector box. When either switch fails to close at the correct water-column (W.C.) rating, the control board never advances past the inducer prove stage, resulting in a no-heat lockout with no ignition attempt. A cracked hose, stuck diaphragm, or out-of-spec switch are the most common culprits.

• Specs: 312926-252 — High Pressure Switch | 312926-258 — Low Pressure Switch | Factory-calibrated W.C. rating | Single-pole normally-open (SPNO) design | 1/4" spade terminals | Matched to inducer airflow specifications for Carrier CH14NA04800GAAAA
• OEM vs Generic: OEM pressure switches are factory-calibrated to exact W.C. setpoints for this model. Generic alternatives frequently carry wide tolerance bands that cause nuisance lockouts or, worse, fail to detect a true draft fault — a potential safety hazard with gas appliances.
• Install difficulty: 2/5 — Turn off power and gas before beginning. Tools needed: 1/4" nut driver, needle-nose pliers, and a manometer (optional, for verification). Disconnect the rubber sensing hose and two spade terminals, swap the switch, and confirm the hose is free of cracks or blockages before reassembly.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our climate-controlled warehouse.

Compatibility: Designed specifically for the Carrier CH14NA04800GAAAA condensing unit. Always verify part numbers 312926-252 and 312926-258 against your unit's wiring diagram or data plate before ordering. If you are unsure which switch has failed — high or low — our parts team can help diagnose before you buy. Order now and get same-day shipping on in-stock OEM Carrier pressure switches.