OEM Carrier Low Pressure Switch 312926-258 for Model CH16NA04200GBAAA

This OEM low pressure switch (part number 312926-258) is the factory-specified replacement for the Carrier CH16NA04200GBAAA air handler and associated system configurations. The pressure switch is a critical safety component that monitors negative pressure created by the inducer draft motor to confirm adequate airflow before allowing the ignition sequence to proceed. When this switch fails or becomes stuck open, the control board will not advance past the inducer stage, resulting in a no-heat lockout condition with no ignition attempt. Common symptoms include the inducer running continuously with no ignition, fault codes indicating a pressure switch failure, or intermittent heating that clears after a manual reset.

• Specs: Low pressure switch | OEM part number 312926-258 | Factory-calibrated W.C. (water column) set point | Single-port design | 1/4" Spade terminal connections | Matches original factory wiring and mounting configuration exactly
• OEM vs Generic: This OEM switch is calibrated to the precise water column rating required by the Carrier CH16NA04200GBAAA. Aftermarket pressure switches frequently carry wider tolerances on their set points, which can cause nuisance lockouts in cold weather or — more dangerously — allow operation under unsafe draft conditions. Always match the exact W.C. rating stamped on your original switch.
• Install Difficulty: 2/5 — Power down the unit at the disconnect and thermostat before beginning. Tools needed: 1/4" nut driver or flat-head screwdriver, needle-nose pliers, and a multimeter to confirm switch continuity after installation. Photograph the tubing and wiring connections before removing the old switch. Inspect the rubber hose port for cracks or blockages that may have caused the original failure.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse when ordered before 3 PM local cutoff.

Compatibility: Designed as a direct OEM replacement for the Carrier model CH16NA04200GBAAA. Always verify the W.C. rating and port configuration on your existing switch's data label before ordering to ensure an exact match. Our HVAC parts specialists are available to confirm fitment prior to purchase — no guesswork required. Order today for same-day shipping and get your system back online fast.