OEM Carrier High & Low Pressure Switch for Model CH13NA04800GACBA

These OEM pressure switches — part numbers 312926-252 (High Pressure Switch) and 312926-258 (Low Pressure Switch) — are the factory-specified replacements for the Carrier CH13NA04800GACBA condensing unit. Pressure switches prove that the inducer motor has established adequate airflow through the heat exchanger before allowing ignition to proceed. When either switch fails — or the circuit they monitor falls out of range — the control board withholds the ignition signal, resulting in a no-heat lockout condition. Common symptoms include repeated ignition attempts with no flame, a blinking fault code indicating an open pressure switch circuit, or a furnace that runs the inducer but never advances to the heating stage.

• Specs: 312926-252 — High Pressure Switch | 312926-258 — Low Pressure Switch | Factory-calibrated W.C. (water column) setpoint | SPST normally-open configuration | Designed for R-410A system pressures on Carrier CH13NA04800GACBA
• OEM vs Generic: OEM pressure switches are precision-calibrated to the exact water-column rating required by this model. Off-brand substitutes frequently carry wider tolerances, risking nuisance trips or — more dangerously — failure to detect a true blocked-flue condition.
• Install Difficulty: 3/5 — Requires shutting off power and gas before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, manometer (recommended to verify W.C. reading post-install), and a multimeter to confirm switch continuity. Always inspect inducer hoses and ports for blockage before replacing the switch.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Orders placed before cut-off ship the same business day from our climate-controlled warehouse.

Compatibility: Both switches are engineered specifically for the Carrier CH13NA04800GACBA condensing unit. Confirm which switch — high (312926-252) or low (312926-258) — is indicated by your control board fault code or diagnostic before ordering. If uncertain, our HVAC parts specialists will verify the correct fitment before your order ships. In-stock and ready to ship today — get your system back on before the next heating cycle.