OEM Carrier Low Pressure Switch 312926-258 for Model CH16NA04800GABAA

This OEM low pressure switch (part number 312926-258) is the factory-specified replacement for the Carrier CH16NA04800GABAA condensing unit. The pressure switch monitors the negative pressure (water column) created by the inducer motor to confirm proper venting before allowing the ignition sequence to proceed. When this switch fails or sticks open, the control board cannot verify safe draft conditions and will lock out the system — typically displaying a pressure switch fault code and preventing any heat output.

• Specs: Low pressure switch | OEM part number 312926-258 | Factory-calibrated W.C. (water column) set point | SPST normally-open configuration | Designed for single-stage induced-draft operation
• OEM vs Generic: This is a genuine Carrier OEM pressure switch calibrated to the exact water column rating required by the CH16NA04800GABAA. Generic or universal switches often carry wide set-point tolerances that can cause nuisance lockouts or, more dangerously, fail to detect a true venting fault — a critical safety risk.
• Install difficulty: 2/5 — Shut off power and gas before servicing. Tools needed: 1/4" nut driver, flat-head screwdriver, manometer (recommended to verify W.C. reading post-install). Disconnect the two-wire harness and rubber hose port, swap the switch, and confirm hose is free of cracks or blockage before restarting.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Engineered specifically for the Carrier CH16NA04800GABAA condensing unit. Always verify the existing switch's W.C. rating and part number on the unit's data plate or wiring diagram before ordering to ensure an exact match. Our fitment specialists are available to confirm compatibility before you buy — in stock and ready to ship today.