OEM Carrier High & Low Pressure Switch for Model CH13NA01800GAABA

These OEM pressure switches — part numbers 312926-252 (High Pressure Switch) and 312926-258 (Low Pressure Switch) — are the factory-specified replacements for the Carrier CH13NA01800GAABA packaged or split-system unit. The pressure switch proves that the inducer motor has established proper draft before allowing the ignition sequence to proceed. When either switch fails or sticks, the control board receives no confirmation of safe venting, resulting in a hard lockout — the system attempts ignition, fails, and shuts down without producing heat. A failed pressure switch is one of the most common causes of a furnace or air handler that runs the inducer but never advances to ignition.

• Specs: 312926-252 — High Pressure Switch | 312926-258 — Low Pressure Switch | Factory-calibrated W.C. (water column) rating | OEM-matched port diameter and hose barb fitment for Carrier CH13NA01800GAABA
• OEM vs Generic: OEM pressure switches are calibrated to the exact water-column rating specified by Carrier engineering. Aftermarket substitutes frequently drift out of tolerance, causing nuisance lockouts or — more dangerously — failing to detect true venting problems. Always use OEM on pressure switches.
• Install difficulty: 2/5 — Disconnect power before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, manometer (to verify W.C. rating post-install). Photograph existing hose routing and wiring before removal. Inspect rubber pressure hoses for cracks while you have the switch out.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier CH13NA01800GAABA. Confirm which switch — high (312926-252) or low (312926-258) — requires replacement using a multimeter continuity test before ordering. If you need assistance verifying fitment, our HVAC parts specialists confirm compatibility before your order ships.