OEM Carrier High & Low Pressure Switch for Model CH13NA03600GACAA

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 CH13NA03600GACAA condensing unit. Pressure switches prove that the inducer motor has created adequate draft before allowing the ignition sequence to proceed. When either switch fails, the control board detects an open circuit and locks out the system entirely — resulting in a no-heat condition with no spark or gas flow. Common failure symptoms include the inducer running continuously with no ignition, a blinking fault code indicating pressure switch fault, or a system that resets briefly then locks out again.

• Specs: 312926-252 — High Pressure Switch | 312926-258 — Low Pressure Switch | Factory-calibrated W.C. (water column) set point | SPST normally-open design | OEM-matched electrical connector and hose port diameter
• OEM vs Generic: OEM Carrier pressure switches are factory-calibrated to exact W.C. ratings for this model. Aftermarket substitutes frequently carry wider tolerances, risking nuisance trips or — more dangerously — failure to detect true draft loss, creating a safety hazard.
• Install difficulty: 2/5 — Disconnect power before servicing. Tools needed: 1/4" nut driver, needle-nose pliers, and a manometer to verify W.C. after replacement. Always inspect the rubber hose and port for cracks or blockages before installing the new switch.
• Warranty: 1-year OEM factory warranty on both switches. Orders placed before cutoff ship the same business day from our climate-controlled warehouse.

Compatibility: Designed specifically for the Carrier CH13NA03600GACAA condensing unit. Verify which switch — high (312926-252) or low (312926-258) — corresponds to your fault code before ordering; both are stocked and available for same-day shipping. Not sure which one you need? Our HVAC parts specialists can confirm fitment before you buy.