OEM Carrier Low Pressure Switch 312926-258 for Model CH16NA02400GABAA

This OEM low pressure switch (part number 312926-258) is the factory-specified replacement for the Carrier CH16NA02400GABAA unit. The pressure switch monitors the negative pressure created by the inducer motor to confirm proper venting before allowing ignition to proceed. When this switch fails or sticks open, the control board never receives the proof-of-inducer signal, resulting in a lockout condition — no ignition, no heat. Common symptoms include a system that attempts startup, runs the inducer briefly, then shuts down without lighting the burners.

• Specs: Low pressure switch | OEM part number 312926-258 | Factory-calibrated W.C. (water column) rating | Single-port configuration | Direct plug-in harness connector
• OEM vs Generic: OEM pressure switches are calibrated to the exact water column rating required by the CH16NA02400GABAA's inducer assembly. Off-spec generic switches may trip too early or too late, causing nuisance lockouts or — worse — unsafe operation.
• Install difficulty: 2/5 — Disconnect power before servicing. Tools needed: flat-head screwdriver, needle-nose pliers, and a multimeter to verify continuity before reinstalling the access panel. Photograph the hose port and wiring connections before removal.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed specifically for the Carrier CH16NA02400GABAA. Always verify the W.C. rating stamped on your existing switch matches this listing before ordering — multiple pressure switch ratings may be used across model variants. Our fitment team is available to confirm compatibility before you buy.