OEM Carrier Low Pressure Switch 312926-258 for Model CH16NA01800GAAAA

This OEM low pressure switch (part# 312926-258) is the factory-specified replacement for the Carrier CH16NA01800GAAAA system. The pressure switch is a safety device that monitors the inducer motor's ability to create proper negative pressure (draft) in the flue system before allowing ignition to proceed. When the switch fails — or when it detects insufficient draft — the control board will lock out the ignition sequence, resulting in a no-heat condition. Common symptoms include the inducer running continuously with no ignition attempt, a blinking fault code indicating a pressure switch fault, or a furnace that starts briefly and then shuts down before the burners light.

• Specs: Low Pressure Switch | OEM Part# 312926-258 | Factory-calibrated water column (W.C.) rating | Single-port or dual-port configuration matched to OEM spec | Designed for Carrier CH16NA01800GAAAA
• OEM vs Generic: This is a genuine OEM Carrier pressure switch, calibrated to the exact W.C. rating required by the CH16NA01800GAAAA. Aftermarket switches frequently ship with incorrect trip points, causing nuisance lockouts or — more dangerously — allowing ignition under unsafe draft conditions.
• Install Difficulty: 2/5 — Power down the unit and disconnect the rubber hose from the old switch before unclipping the wiring harness. Tools needed: flathead screwdriver, needle-nose pliers, and optionally a manometer to verify draft pressure after installation. Always check the hose for cracks or blockages before replacing the switch.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier model CH16NA01800GAAAA. Verify your existing switch's W.C. rating and port configuration against your unit's data plate before ordering. If you're unsure of fitment, our HVAC parts specialists can confirm compatibility before your order ships — same-day shipping available on all in-stock OEM parts.