OEM Carrier High & Low Pressure Switch for Model CH13NA04900GABAA

These are the factory OEM replacement pressure switches for the Carrier CH13NA04900GABAA gas furnace — available as the High Pressure Switch (OEM# 312926-252) and Low Pressure Switch (OEM# 312926-258). Pressure switches are safety devices that prove the inducer motor is creating adequate draft before allowing the ignition sequence to proceed. When either switch fails — or when a blocked flue, cracked hose, or weak inducer causes it to trip — the furnace will lock out prior to ignition, often displaying a fault code and leaving your home without heat. Symptoms include the inducer starting normally but the heating cycle never advancing to igniter warm-up.

• Specs: High Pressure Switch OEM# 312926-252 | Low Pressure Switch OEM# 312926-258 | Factory-calibrated water column (W.C.) set point | Single-pole normally open contacts | Designed for induced-draft gas furnace application
• OEM vs Generic: OEM pressure switches are calibrated to the exact W.C. rating specified by Carrier engineering. Generic substitutes frequently drift outside acceptable set-point tolerance, causing nuisance lockouts or — more dangerously — failing to trip when combustion venting is compromised.
• Install Difficulty: 3/5 — Requires disconnecting the rubber hose port, two electrical spade terminals, and one or two mounting screws. Tools needed: flathead screwdriver, needle-nose pliers, manometer (recommended to verify set point), and multimeter to confirm continuity at correct pressure. Always disconnect power at the breaker before servicing.
• Warranty & Shipping: Backed by a 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our warehouse — so your repair doesn't wait.

Compatibility: These pressure switches are factory-specified for the Carrier CH13NA04900GABAA induced-draft gas furnace. Confirm whether you need the high-stage switch (312926-252) or low-stage switch (312926-258) by referencing your furnace's wiring diagram or existing part label before ordering. If you're unsure which switch applies to your fault code, our parts team can verify fitment before you buy. In stock and ready to ship today — get your furnace back online fast.