OEM Carrier High & Low Pressure Switch for Model CH13NA03000GAAAA

These OEM pressure switches — 312926-252 (High Pressure Switch) and 312926-258 (Low Pressure Switch) — are the factory-specified replacements for the Carrier CH13NA03000GAAAA condensing unit. Pressure switches prove that the inducer motor has established adequate draft before allowing the ignition sequence to proceed. When either switch fails or sticks open, the control board interprets it as a venting fault and locks out the system — typically before a single ignition attempt. Common symptoms include a blinking fault code indicating a pressure switch error, an inducer motor that runs continuously without advancing to ignition, or a furnace that starts briefly and immediately shuts back down.

• Specs: 312926-252 — High Pressure Switch | 312926-258 — Low Pressure Switch | Factory-calibrated W.C. (water column) set points | 1/4" Spade terminals | Designed for Carrier CH13NA03000GAAAA inducer pressure circuit
• OEM vs Generic: OEM pressure switches are calibrated to exact W.C. set points for your specific heat exchanger and inducer assembly. Generic alternatives often carry wider tolerances that can cause nuisance lockouts or — more dangerously — fail to detect a true venting fault, creating a safety risk.
• Install Difficulty: 3/5 — Requires disconnecting the rubber hose from the inducer port and swapping the spade terminals. Tools needed: flathead screwdriver, needle-nose pliers, manometer (recommended to verify W.C. set point after install). Always shut off power and gas before servicing. Confirm you are replacing the correct switch (high vs. low) by matching the OEM part number on the faulty component.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship the same business day from our stocked warehouse.

Compatibility: Both switches are engineered specifically for the Carrier CH13NA03000GAAAA condensing unit. Verify the failed switch's OEM part number — 312926-252 for the high pressure switch or 312926-258 for the low pressure switch — before ordering to ensure correct fitment. Not sure which one failed? Our HVAC parts team can help you confirm the right part before you buy. In stock and ready to ship today.